Datasheet DSP1627 Datasheet (AGERE)

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Page 1

Data Sheet March 2000

DSP1627 Digital Signal Processor

1 Features

■ Optimized for digital cellular applications with a bit mani p-

ulation unit for higher coding efficiency.

■ On-chip, programmable, PLL clock synthesizer.

■ 14 ns and 11 ns instruction cycle times at 5 V, 10 ns in-

struction cycle time at 3.0 V, and 20 ns and 12.5 ns instruction cycle times at 2.7 V, respectively.

■ Mask-programmable memory map option: The

DSP1627x36 features 36 Kwords on-chip ROM. The DSP1627x32 features 32 Kwords on-chip ROM and access to 16 Kwords external ROM in the same map. Both feature 6 Kwords on-chip, dual-port RAM and a secure option for on-chip ROM.

■ Low power consumption:

— <5.5 mW/MIPS typical at 5 V. — <1.5 mW/MIPS typical at 2.7 V.

■ Flexible power management modes:

— Standard sleep: 0.5 mW/MIPS at 5 V.

0.12 mW/MIPS at 2.7 V.

— Sleep with slow internal clock: 1.4 mW at 5 V.

0.4 mW at 2.7 V.

— Hardware STOP (pin halts DSP): <20 µA.

■ Mask-programmable clock options: crystal oscillator,

small signal, and CMOS.

■ Low-profile TQFP package (1.5 mm) available.

■ Sequenced accesses to X and Y external memory.

■ Object code compatible with the DSP1617.

■ Single-cycle squaring.

■ 16 x 16-bit multiplication and 36-bit accumulation in one

instruction cycle.

■ Instruction cache for high-speed, program-efficient, zero-

overhead looping.

■ Dual 25 Mbits/s serial I/O ports with multiprocessor capa-

bility—16-bit data channel, 8-bit protocol channel.

■ 8-bit parallel host interface:

— Supports 8- or 16-bit transfers. —

Motorola

■ 8-bit control I/O interface.

■ 256 memory-mapped I/O ports.

■

IEEE

Motorola Intel

is a registered trademark of Intel Corp.

† ‡

IEEE

and Electronics Engineers, Inc.

‡

P1149.1 test port (JTAG boundary scan).

is a registered trademark of Motorola, Inc.

is a registered trademark of The Institute of Electrical

Intel

†

compatible.

■ Full-speed in-circuit emulation hardware development

system on-chip.

■ Supported by DSP1627 software and hardware develop-

ment tools.

2 Description

The DSP1627 is Lucent Technologies Microelectronics Group first digital signal processor offering 100 MIPS operation at 3.0 V and 80 MIPS operation at 2.7 V with a reduction in power consumption. Designed specifically for applications requiring low power dissipation in digital cellular systems, the DSP1627 is a signal-coding device that can be programmed to perform a wide variety of fixed-point signal processing functions. The device is based on the DSP1600 core with a bit manipulation unit for enhanced signal coding efficiency. The DSP1627 includes a mix of peripherals specifically intended to support processingintensive but cost-sensitive applications in the area of digital wireless communications.

The DSP1627x36 contains 36 Kwords of internal ROM (IROM), but it doesn’t support the use of IROM and external ROM (EROM) in the same memory map. The DSP1627x32 supports the use of 32 Kwords of IROM with 16 Kwords of EROM in the same map. Both devices contain 6 Kwords of dual-port RAM (DPRAM), which allows simultaneous access to two RAM locations in a single instruction cycle.

The DSP1627 is object code compatible wi th the DSP1617, while providing more memory and architectural enhancements including an on-chip clock synthesizer and an 8-bit parallel host interface for hardware flexibility.

The DSP1627 supports 2.7 V, 3.0 V, and 5 V operation and flexible power management modes required for portable cellular terminals. Several control mechanis ms achieve lowpower operation, including a STOP pin for placing the DSP into a fully static, halted state and a programmable power control register used to power down unused on-chip I/O units. These power management modes allow for trade-offs between power reduction and wake-up latency requirements. During system standby, power consumption is reduced to less than 20 µA.

The on-chip clock synthesizer can be driv en by an external clock whose frequency is a fraction of the instruction rate.

The device is packaged in a 100-pin BQFP or a 100-pin TQFP and is available with 14 ns and 11 ns instruction cycle times at 5 V, 10 ns instruction cycle times at 3.0 V, and 20 ns and 12.5 ns instruction cycle times at 2.7 V, respectively.

Page 2

Data Sheet

DSP1627 Digital Signal Processor March 2000

Contents Page Contents Page

1 Features.............................................................. 1

2 Description.......................................................... 1

3 Pin Information........................... ...... ....... ...... ...... 3

4 Hardware Architecture........................................ 7

4.1 DSP1627 Architectural Overview............. 7

4.2 DSP1600 Core Architectural Overview .. 10

4.3 Interrupts and Trap................................. 11

4.4 Memory Maps and Wait-States.............. 16

4.5 External Memory Interface (EMI)............ 18

4.6 Bit Manipulation Unit (BMU)................... 19

4.7 Serial I/O Units (SIOs)............................ 19

4.8 Parallel Host Interface (PHIF)................. 22

4.9 Bit Input/Output Unit (BIO)...................... 23

4.10 Timer ...................................................... 23

4.11 JTAG Test Port....................................... 24

4.12 Clock Synthesis...................................... 26

4.13 Power Management ............................... 29

5 Software Architecture ....................................... 36

5.1 Instruction Set......................................... 36

5.2 Register Settings .................................... 45

5.3 Instruction Set Formats .......................... 55

6 Signal Descriptions ........................................... 61

6.1 System Interface..................................... 61

6.2 External Memory Interface ..................... 63

6.3 Serial Interface #1 .................................. 64

6.4 Parallel Host Interface or Serial

Interface #2 and Control I/O Interface.... 65

6.5 Control I/O Interface ............................... 65

6.6 JTAG Test Interface ............................... 66

7 Mask-Programmable Options ........................... 67

7.1 Input Clock Options ................................ 67

7.2 Memory Map Options ............................. 67

7.3 ROM Security Options............................ 67

8 Device Characteristics ...................................... 68

8.1 Absolute Maximum Ratings.................... 68

8.2 Handling Precautions ............................. 68

8.3 Recommended Operating Conditions .... 68

8.4 Package Thermal Considerations .......... 69

9 Electrical Characteristics and Requirements .... 70

9.1 Power Dissipation................................... 73

10 Timing Characteristics for 5 V Operation.......... 75

10.1 DSP Clock Generation ........................... 76

10.2 Reset Circuit........................................... 77

10.3 Reset Synchronization............................ 78

10.4 JTAG I/O Specifications.......................... 79

10.5 Interrupt .................................................. 80

10.6 Bit Input/Output (BIO) ............................. 81

10.7 External Memory Interface...................... 82

10.8 PHIF Specifications ................................ 86

10.9 Serial I/O Specifications.......................... 92

10.10 Multiprocessor Communication .............. 97

11 Timing Characteristics for 3.0 V Operation ....... 98

11.1 DSP Clock Generation............................ 99

11.2 Reset Circuit......................................... 100

11.3 Reset Synchronization....... ...... ....... ...... 101

11.4 JTAG I/O Specifications........................ 102

11.5 Interrupt ................................................ 103

11.6 Bit Input/Output (BIO) ........................... 104

11.7 External Memory Interface.................... 105

11.8 PHIF Specifications .............................. 109

11.9 Serial I/O Specifications........................ 115

11.10 Multiprocessor Communication ............ 120

12 Timing Characteristics for 2.7 V Operation ..... 121

12.1 DSP Clock Generation.......................... 122

12.2 Reset Circuit......................................... 123

12.3 Reset Synchronization....... ...... ....... ...... 124

12.4 JTAG I/O Specifications........................ 125

12.5 Interrupt ................................................ 126

12.6 Bit Input/Output (BIO) ........................... 127

12.7 External Memory Interface.................... 128

12.8 PHIF Specifications .............................. 132

12.9 Serial I/O Specifications........................ 138

12.10 Multiprocessor Communication ............ 143

13 Crystal Electrical Characteristics and

Requirements.................................................. 144

13.1 External Components for the Crystal

Oscillator............................................... 144

13.2 Power Dissipation................................. 144

13.3 LC Network Design for Third

Overtone Crystal Circuits...................... 147

13.4 Frequency Accuracy Considerations.... 149

14 Outline Diagrams ............................................ 152

14.1 100-Pin BQFP (Bumpered Quad

Flat Pack).............................................. 152

14.2 100-Pin TQFP (Thin Quad Flat Pack)... 153

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Data Sheet March 2000 DSP1627 Digital Signal Processor

3 Pin Information

V DB4 DB3 DB2 DB1 DB0

ERAMHI

ERAMLO

EROM

RWN

EXM AB15 AB14

AB13 AB12 AB11 AB10

AB9 AB8 AB7

DB5

DB6

DB10

DB9

DB8

DB7

DB11

DB12

DB13

DB14

DB15

VDDIBF1

100

OBE1

DI1

ILD1

OLD1

OCK1

ICK1

DO1

SYNC1

V SADD1 DOEN1

PIN #1 IDENTIFIER ZONE

OCK2/PCSN DO2/PSTAT SYNC2/PBSEL ILD2/PIDS OLD2/PODS

IBF2/PIBF OBE2/POBE ICK2/PB0 DI2/PB1

DSP1627

V DOEN2/PB2 SADD2/PB3

V IOBIT0/PB4 IOBIT1/PB5

IOBIT2/PB6 IOBIT3/PB7 VEC3/IOBIT4 VEC2/IOBIT5 VEC1/IOBIT6 VEC0/IOBIT7

AB0

AB1

AB2

AB3

AB4

AB5

AB6

INT0

INT1

IACK

TRAP

STOP

TCK

CKO

RSTB

TMS

TDO

DDA

TDI

CKI

CKI2

SSA

5-4218 (F).b

Figure 1. DSP1627 BQFP Pin Diagram

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Data Sheet

DSP1627 Digital Signal Processor March 2000

3 Pin Information

VDDDB5

DB4 DB3

DB2 DB1 DB0

ERAMHI

ERAMLO

EROM

RWN

EXM

AB15 AB14

AB13 AB12

AB11 AB10

AB9 AB8

AB7

100

(continued)

DB6

DB7

DB8

DO1

SYNC1

DB9

DB10

VSSDB11

DB12

DB13

DB14

DB15

VDDOBE1

IBF1

VSSDI1

ILD1

OLD1

ICK1

OCK1

SADD1 DOEN1

OCK2/PCSN DO2/PSTAT

SYNC2/PBSEL

ILD2/PIDS OLD2/PODS IBF2/PIBF OBE2/POBE ICK2/PB0 DI2/PB1

DSP1627

V DOEN2/PB2

SADD2/PB3

IOBIT0/PB4 IOBIT1/PB5

IOBIT2/PB6 IOBIT3/PB7 VEC3/IOBIT4 VEC2/IOBIT5

VEC1/IOBIT6 VEC0/IOBIT7

AB6

AB5

AB4

AB3

AB2

AB0

AB1

INT1

INT0

IACK

STOP

TRAP

RSTB

TCK

CKO

TMS

TDO

DDA

TDI

CKI

CKI2

SSA

5-4219 (F).b

Figure 2. DSP1627 TQFP Pin Diagram

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Data Sheet March 2000 DSP1627 Digital Signal Processor

3 Pin Information

(continued)

Functional descriptions of pins 1—100 are found in Section 6, Signal Descriptions. The functionality of pins 61 and 62 (TQFP pins 48 and 49) are mask-programmable (see Section 7, Mask-Programmable Options). Input levels on all I and I/O type pins are designed to remain at full CMOS levels when not driven by the DSP.

Table 1. Pin Descriptions

BQFP Pin TQFP Pin Symbol Type Name/Function

1, 2, 3, 4,

5, 7, 8, 9, 10, 11, 12, 15, 16, 17,

18, 19

88, 89, 90, 91, 92, 94, 95, 96, 97,

98, 99, 2,

3, 4, 5, 6 20 7 IO 21 8 ERAMHI 23 10 ERAMLO 24 11 EROM 25 12 RWN

DB[15:0] I/O* External Memory Data Bus DB[15:0].

†

Data Address 0x4000 to 0x40FF I/O Enable.

†

Data Address 0x8000 to 0xFFFF External RAM Enable.

†

Data Address 0x4100 to 0x7FFF External RAM Ena ble.

†

Program Address External ROM Enable.

†

Read/Write Not.

27 14 EXM I External ROM Enable.

28, 29, 31, 32, 33, 34, 35, 36, 37, 40, 41, 42, 43, 44, 45,

15, 16, 18, 19, 20, 21, 22, 23, 24, 27, 28, 29, 30, 31, 32,

AB[15:0] O* External Memory Address Bus 15—0.

47 34 INT1 I Vectored Interrupt 1. 48 35 INT0 I Vectored Interrupt 0. 50 37 IACK O* Interrupt Acknowledge. 51 38 STOP I STOP Inpu t Clock. 52 39 TRAP I/O* Nonmaskable Program Trap/Breakpoint Indication. 53 40 RSTB I Reset Bar. 54 41 CKO

†

Processor Clock Output.

56 43 TCK I JTAG Text Clock.

‡

57 44 TMS 58 45 TDO 59 46 TDI

JTAG Test Mode Select.

JTAG Test Data Output.

‡

JTAG Test Data Input.

Mask-Programmable Input Clock Option

CMOS Small

Signal

61 48 CKI** I CKI V 62 49 CKI2** I V

SSA

XLO, 10 pF capacitor to V

XHI, 10 pF capacitor to V

Crystal

Oscillator CMOS

CKI

Open

65 52 VEC0/IOBIT7 I/O* Vectored Interrupt Indication 0/Status/Control Bit 7. 66 53 VEC1/IOBIT6 I/O* Vectored Interrupt Indication 1/Status/Control Bit 6. 67 54 VEC2/IOBIT5 I/O* Vectored Interrupt Indication 2/Status/Control Bit 5. 68 55 VEC3/IOBIT4 I/O* Vectored Interrupt Indication 3/Status/Control Bit 4.

* 3-states when RSTB = 0, or by JTAG control. † 3-states when RSTB = 0 and INT0 = 1. Output = 1 when RSTB = 0 and INT0 = 0, except CKO which is free-running. ‡ Pull-up devices on input.

§ 3-states by JTAG control. ** See Section 7, Mask-Programmable Options. †† For SIO multiprocessor applications, add 5 kΩ external pull-up resistors to SADD1 and/or SADD2 for proper initialization.

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Data Sheet

DSP1627 Digital Signal Processor March 2000

3 Pin Information

(continued)

Functional descriptions of pins 1—100 are found in Section 6, Signal Descriptions.

Table 1. Pin Descriptions

(continued)

BQFP Pin TQFP Pin Symbol Type Name/Function

69 56 IOBIT3/PB7 I/O* Status/Control Bit 3/PHIF Data Bus Bit 7. 70 57 IOBIT2/PB6 I/O* Status/Control Bit 2/PHIF Data Bus Bit 6. 71 58 IOBIT1/PB5 I/O* Status/Control Bit 1/PHIF Data Bus Bit 5. 72 59 IOBIT0/PB4 I/O* Status/Control Bit 0/PHIF Data Bus Bit 4. 74 61

SADD2/PB3

††

I/O* SIO2 Multiprocessor Address/PHIF Data Bus Bit 3. 75 62 DOEN2/PB2 I/O* SIO2 Data Output Enable/PHIF Data Bus Bit 2. 77 64 DI2/PB1 I/O* SIO2 Data Input/PHIF Data Bus Bit 1. 78 65 ICK2/PB0 I/O* SIO2 Input Clock/PHIF Data Bus Bit 0. 79 66 OBE2/POBE O* SIO2 Output Buffer Empty/PHIF Output Buffer Empty. 80 67 IBF2/PIBF O* SIO2 Input Buffer Full/PHIF Input Buffer Full. 81 68 OLD2/PODS I/O* SIO2 Output Load/PHIF Output Data Strobe. 82 69 ILD2/PIDS I/O* SIO2 Input Load/PHIF Input Data Strobe. 83 70 SYNC2/PBSEL I/O* SIO2 Multiprocessor Synchronization/PHIF Byte Select. 84 71 DO2/PSTAT I/O* SIO2 Data Output/PHIF Status Register Select. 85 72 OCK2/PCSN I/O* SIO2 Output Clock/PHIF Chip Select Not. 86 73 DOEN1 I/O* SIO1 Data Output Enable. 87 74

SADD1

††

I/O* SIO1 Multiprocessor Address. 90 77 SYNC1 I/O* SIO1 Multiprocessor Synchronization. 91 78 DO1 O* SIO1 Data Output. 92 79 OLD1 I/O* SIO1 Output Load. 93 80 OCK1 I/O* SIO1 Output Clock. 94 81 ICK1 I/O* SIO1 Input Clock. 95 82 ILD1 I/O* SIO1 Input Load. 96 83 DI1 I SIO1 Data Input. 98 85 IBF1 O* SIO1 Input Buffer Full. 99 86 OBE1 O* SIO1 Output Buffer Empty.

6, 15, 26,

38, 49, 64,

76, 89, 97

14, 22, 30, 39, 55, 73,

88, 100

60 47 V 63 50 V

93, 1, 13,

25, 36, 51,

63, 76, 84

100, 9, 17, 26, 42, 60,

75, 87

DDA SSA

P Ground.

P Power Supply.

P Analog Power Supply. P Analog Ground.

* 3-states when RSTB = 0, or by JTAG control. † 3-states when RSTB = 0 and INT0 = 1. Output = 1 when RSTB = 0 and INT0 = 0.

§ Pull-up devices on input. ‡ 3-states by JTAG control. ** See Section 7, Mask-Programmable Options. †† For SIO multiprocessor applications, add 5 kΩ external pull-up resistors to SADD1 and/or SADD2 for proper initialization.

6 Lucent Technologies Inc.

Page 7

Data Sheet March 2000 DSP1627 Digital Signal Processor

4 Hardware Architecture

The DSP1627 device is a 16-bit, fixed-point programmable digital signal processor (DSP). The DSP1627 consists of a DSP1600 core to ory and peripherals. Added architectural features give the DSP1627 high program efficiency for signal coding applications.

4.1 DSP1627 Architectural Overview

Figure 3 shows a block diagram of the DSP1627. The following modules make up t he D SP1627.

DSP1600 Core

The DSP1600 core is the heart of the DSP1627 chip. The core contains data and address arithmetic units, an d control for on-chip memory and peripherals. The core provides support for external memory wait-states and onchip, dual-port RAM and features vectored interrupts and a trap mechanism.

Dual-Port RAM (DPRAM)

This module contains six banks of zero wait-state memory. Each bank consists of 1K 16-bit words and has separate address and data ports to the instruction/coefficient and data memory space s. A program can reference memory from either space. The DSP1600 core automatically performs the required multiplexing. If references to both ports of a single bank are made simultaneously, the DSP1600 core automatically inserts a wait-state and performs the data port access first, followed by the instruction/coefficient port access.

A program can be downloaded from slow, off-chip memory into DPRAM, and then executed without wait-states. DPRAM is also useful for improving convolution perf ormance in cases where the coefficients are adaptive. Since DPRAM can be dow nloaded through the JTAG port, full-speed remote in -c irc uit em ulation is possible. DPRAM can also be used for downloading self-test code via the JTAG port.

Read-Only Memory (ROM)

The DSP1627x36 contains 36K 16-bit words of zero wait-state mask-progr am m able ROM for program and fixed coefficients. Simila rly , the DS P1627x32 has 32K 16-bit words of ROM and acc es s to 16 Kw ords of external ROM.

External Memory Multiplexer (EMUX)

The EMUX is used to connec t the DS P1627 to external memory and I/O devices. I t supports read/write opera tions from/to instruction/coefficient memory (X memory space) and data memory (Y memory space). The DSP1600 core automatically controls the EMUX. Instruc-

ether with on-chip mem-

tions can transparently refere nc e ex t ernal memory from either set of internal buses. A sequencer allows a single instruction to access both the X and the Y external memory spaces.

Clock Synthesis

The DSP powers up with a 1X input clock (CKI/CKI2) as the source for the processor clock. An on-chip clock synthesizer (PLL) can also be used to generate the system clock for the DSP, which will run at a freque nc y mu lti ple of the input clock. The clock s y nt hes iz er is deselected and powered down on reset. For low-power operation, an internally generated slow clo c k can be used to drive the DSP. If both the clock synthesizer and the internally generated slow clock are selec t ed, th e s low c loc k wi ll driv e the DSP; however, the synt hesizer will continue to run.

The clock synthesizer and other programmable cloc k sources are discussed in Section 4.12. The use of these programmable clock so urc es f or power management is discussed in Section 4.13.

Bit Manipulation Unit (BMU)

The BMU extends the DSP1600 core instruction set to provide more efficient bit operations on accumula to rs . The BMU contains logic for barrel shifting, normalization, and bit field insertion/extraction. The unit also contains a set of 36-bit alternate accu m ulators. The data in the alternate accumulators can be shuffled with the data in the main accumulators. Flags returned by the BMU mesh seamlessly with the DSP1600 conditional instructions.

Bit Input/Output (BIO)

The BIO provides conve nient and efficient monitorin g and control of eight individually configurable pins. When configured as outputs, th e pins can be individually set, cleared, or toggled. When configured as inputs, individual pins or combinations of pins can be tested for patterns. Flags returned by the BIO me s h se am lessly with conditional instructions.

Serial Input/Output Units (SIO and SIO2)

SIO and SIO2 offer asynchronous, full-duplex, do ublebuffered channels that operate at up to 25 Mbits/s (for 20 ns instruction cycle in a nonmultiprocessor configuration), and easily interface with other Lucent Technologies fixed-point DSPs in a multiple-processor environm ent. Commercially availab le c odecs and time-division mu lti plex (TDM) channels can be interfaced to the serial I/O ports with few, if any, additional components. SIO2 is identical to SIO.

An 8-bit serial protocol channel may be transmitted in addition to the address of the ca lled processor in multiprocessor mode. This feature is useful for transmitting highlevel framing informatio n or f or error detection and correction. SIO2 and BIO are pin-multiplexed with the PHIF.

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Data Sheet

DSP1627 Digital Signal Processor March 2000

4 Hardware Architecture

AB[15:0]DB[15:0]

ioc

DUAL-PORT

RAM

6K x 16

CKI

CKI2

CKO RSTB STOP TRAP

INT[1:0]

IACK

VEC[3:0] OR IOBIT[7:4]

DO2 OR PSTAT OLD2 OR PODS OCK2 OR PCSN OBE2 OR POBE

SYNC2 OR PBSEL

ICK2 OR PB0

ILD2 OR PIDS

DI2 OR PB1

IBF2 OR PIBF DOEN2 OR PB2 SADD2 OR PB3

IO BIT[3:0] OR PB[7:4]

M U X

(continued)

RWN EXM EROM ERAMHI

EXTERNAL MEMORY INTERFACE & EMUX

YAB YDB XDB XAB BMU

DSP1600 CORE

PHIF phifc

PSTAT

pdx0(IN)

pdx0(OUT)

I/O

IDB

powerc

BIO

sbit cbit

36K/32K x 16

aa0 aa1

ar0 ar1 ar2 ar3

pllc

ERAMLO

ROM

†

SIO2

sdx2(OUT)

srta2

tdms2

sdx2(IN)

sioc2

saddx2

JTAG

BOUNDARY SCAN

jtag

JCON

BYPASS

HDS

BREAKPOINT

TRACE

TIMER

timerc timer0

sdx(OUT)

sdx(IN)

SIO

srta

tdms

sioc

saddx

TDO TDI

TCK TMS

TRST

DI1 ICK1 ILD1 IBF1 DO1 OCK1 OLD1 OBE1 SYNC1 SADD1 DOEN1

5-4142 (F).f

* These registers are accessible through the pins only. † 36K x 16 for the DSP1627x36; 32K x 16 for the DSP1627x32.

Figure 3. DSP1627 Block Diagram

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Data Sheet March 2000 DSP1627 Digital Signal Processor

4 Hardware Architecture

Table 2. DSP1627 Block Diagram Legend

Symbol Name

aa<0—1> Alternate Accumulators.

ar<0—3> Auxiliary BMU Registers.

BIO Bit Input/Output Unit.

BMU Bit Manipulation Unit .

BREAKPOINT Four Instruction Breakpoint Registers.

BYPASS JTAG Bypass Register.

cbit Control Register for BIO.

EMUX External Memory Multiplexer.

HDS Hardware Development System.

ID JTAG Device Identification Register.

IDB Internal Data Bus.

ioc I/O Configuration Register.

JCON JTAG Configuration Registers.

jtag 16-bit Serial/Parallel Register.

pdx0(in) Parallel Data Transmit Input Register 0.

pdx0(out) Parallel Data Transmit Output Register 0.

PHIF Parallel Host Interface. phifc Parallel Host Interface Control Register.

pllc Phase-Locked Loop Control Register.

powerc Power Control Register.

PSTAT Parallel Host Interface Status Register.

ROM Internal ROM (36 Kwords for DSP1627x36, 32 Kwords for DSP1627x32).

saddx Multiprocessor Protocol Register.

saddx2 Multiprocessor Protocol Register for SIO2.

sbit Status Register for BIO.

sdx(in) Serial Data Transmit Input Register. sdx2(in) Serial Data Transmit Input Register for SIO2. sdx(out) Serial Data Transmit Output Register.

sdx2(out) Serial Data Transmit Output Register for SIO2.

SIO Serial Input/Output Unit.

SIO2 Serial Input/Output Unit #2.

sioc Serial I/O Control Register.

sioc2 Serial I/O Control Register for SIO2.

srta Serial Receive/Transmit Address Register. srta2 Serial Receive/Transmit Address Register for SIO2. tdms Serial I/O Time-division Multiplex Signal Control Register.

tdms2 Serial I/O Time-division Multiplex Signal Control Register for SIO2.

TIMER Programmab le Time r.

timer0 Timer Running Count Register.

timerc Timer Control Register.

TRACE Program Discontinuity Trace Buffer.

XAB Program Memory Address Bus. XDB Program Memory Data Bus. YAB Data Memory Address Bus. YDB Data Memory Data Bus.

(continued)

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Data Sheet

DSP1627 Digital Signal Processor March 2000

4 Hardware Architecture

Parallel Host Interface (PHIF)

The PHIF is a passive, 8-bit parallel port which can interface to an 8-bit bus containing other Lucent Technologies DSPs (e.g., DSP1620, DSP1627, DSP1628, DSP1629, DSP1611, DSP1616, DSP1617, DSP1618), microprocessors, or peripheral I/O devices. The PHIF port supports either as 8-bit or 16-bit transfers, configured in software. The port data rate depends upon the instruction cycle rate. A 25 ns instruction cycle allows the PHIF to support data rates up to 11.85 Mbytes/s, assuming the external host device can transfer 1 byte of data in 25 ns.

The PHIF is accessed in two basic modes: 8-bit or 16-bit mode. In 16-bit mode, the host determines an access of the high or low byte. In 8-bit mode, only the low byte is accessed. Software-programmable features allow for a glueless host interfac e to microprocessors (see Section 4.8, Parallel Host Interface).

Timer

Motorola

Intel

(continued)

protocols, as well

In systems with multiple processors, the processors may be configured such that any processor reaching a breakpoint will cause all the other processors to be trapped (see Section 4.3, Interrupts and Trap).

Pin Multiplexing

In order to allow flexible device interfacing while maintaining a low package pin count, the DSP1627 multiplexes 16 package pins between BIO, PHIF, VEC[3:0], and SIO2.

Upon reset, the vectored interrupt indication signals, VEC[3:0], are connected to the package pins while IOBIT[4:7] are disconnected. Setting bit 12, EBIOH, of the ioc register connects IOBIT[4:7] to the package pins and disconnects VEC[3:0].

Upon reset, the parallel host interface (PHIF) is connected to the package pins while the second serial port (SIO2) and IOBIT[3:0] are disconnected. Setting bit 10, ESIO2, of the ioc register connects the SIO2 and IOBIT[3:0] and disconnects the PHIF.

Power Management

The timer can be used to provide an interrupt at the expiration of a programmed interval. The interrupt may be single or repetitive. More than nine orders of magnitude of interval selection are provided. The timer may be stopped and restarted at any time.

Hardware Development System (HDS) Module

The on-chip HDS performs instruction breakpointing and branch tracing at full speed without additional offchip hardware. Using the JTAG port, the breakpointing is set up, and the trace history is read back. The port works in conjunction with the HDS code in the on-chip ROM and the hardware and software in a remote computer. The HDS code must be linked to the user's application code and reside in the first 4 Kwords of ROM. The on-chip HDS cannot be used with the secure ROM masking option (see Section 7.3, ROM Security Options).

Four hardware breakpoints can be set on instruction addresses. A counter can be preset with the number of breakpoints to receive before trapping the core. Breakpoints can be set in interrupt service routines. Alternately, the counter can be preset with the number of cache instructions to execute before trapping the core.

Every time the program branches instead of executing the next sequential instruction, the addresses of the instructions executed before and after the branch are caught in circular memory. The memory contains the last four pairs of program discontinuities for hardware tracing.

Many applications, such as portable cellular terminals, require programmable sleep modes for power management. There are three different control mechanisms for achieving low-power operation: the powerc control register, the STOP pin, and the AWAIT bit in the alf register. The AWAIT bit in the alf r egister al lows the pr ocessor to go into a power-saving standby mode until an interrupt occurs. The powerc register configures various powersaving modes by controlling internal clocks and peripheral I/O units. The STOP pin controls the internal processor clock. The various power management options may be chosen based on power consumption and/or wake-up latency requirements.

4.2 DSP1600 Core Architectural Overview

Figure 4 shows a block diagram of the DSP1600 core.

System Cache and Control Section (SYS)

This section of the core contains a 15-word cache memory and controls the instruction sequencing. It handles vectored interrupts and traps, and also provides decoding for registers outside of the DSP1600 core. SYS stretches the processor cycle if wait-states are required (wait-states are programmable for external memory accesses). SYS sequences downloading via JTAG of selftest programs to on-chip, dual-port RAM.

The cache loop iteration count can be specified at run time under program control as well as at assembly time.

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Data Sheet March 2000 DSP1627 Digital Signal Processor

4 Hardware Architecture

Data Arithmetic Unit (DAU)

The data arithmetic unit (DAU) contains a 16 x 16-bit parallel multiplier that generates a full 32-bit product in one instruction cycle. The product can be accumulated with one of two 36-bit accumulators. The accumulator data can be directly loaded from, or stored to, memory in two 16-bit words with optional saturation on overflow. The arithmetic logic unit (ALU) supports a full set of arithmetic and logical operations on either 16- or 32-bit data. A standard set of flags can be tested for conditional ALU operations, branches, and subroutine calls. This procedure allows the processor to perform as a powerful 16- or 32-bit microprocessor for logical and control applications. The available instruction set is fully compatible with the DSP1617 instruction set. See Section

5.1 for more information on the instruction set. The user also has access to two additional DAU regis-

ters. The psw register contains status information from the DAU (see Table 26, Processor Status Word Register). The arithmetic control register, auc, is used to configure some of the features of the DAU (see Table 27) including single-c ycle squar i ng. Th e auc regis ter alignment field supports an arithmetic shift left by one and left or right by two. The auc register is cleared by reset.

The counters c0 to c2 are signed, 8 bits wide, and may be used to count events such as the number of times the program has executed a sequence of code. They are controlled by the conditional instructions and provide a convenient method of program looping.

(continued)

The YAAU allows direct (or indexed) addressing of data memory. In direct addressing, the 16-bit base register (ybase) supplies the 11 most significant bits of the address. The direct data instruction supplies the remaining 5 bits to form an address to Y memory space and also specifies one of 16 registers for the source or destination.

X Space Address Arithmetic Unit (XAAU)

The XAAU supports high-speed, register-indirect, instruction/coefficient memory addressing with postmodification of the register. The 16-bit pt register is used for addressing coefficients. The signed register i holds a user-defined postincrement. A fixed postincrement of +1 is also available. Register PC is the program counter. Registers pr and pi hold the return address for subroutine calls and interrupts, respectively.

The XAAU decodes the 16-bit instruction/coefficient address and produces enable signals for the appropriate X memory segment. The addressable X segments are internal ROM (up to 36 Kwords for the DSP1627x36, up to 32 Kwords for the DSP1627x32), six 1K banks of DPRAM, and external ROM.

The locations of these memory segments depend upon the memory map selected (see Table 5). A security mode can be selected by mask option. This prevents unauthorized access to the contents of on-chip ROM (see Section 7, Mask-Programmable Options).

4.3 Interrupts and Trap

Y Space Address Arithmetic Unit (YAAU)

The YAAU supports high-speed, register-indirect, compound, and direct addressing of data (Y) memory. Four general-purpose, 16-bit registers, r0 to r3, are available in the YAAU. These registers can be used to supply the read or write addresses for Y space data. The YAAU also decodes the 16-bit data memory address and outputs individual memory enables for the data access. The YAAU can address the six 1 Kword banks of onchip DPRAM or three external data memory segments. Up to 48 Kwords of off-chip RAM are addressable, with 16K addresses reserved for internal RAM.

Two 16-bit registers, rb and re, allow zero-overhead modulo addressing of data for efficient filter implementations. Two 16-bit signed registers, j and k, are used to hold user-defined postmodification increments. Fixed increments of +1, –1, and +2 are also available. Four compound-addressing modes are provided to make read/write operations more effi cient.

Lucent Technologies Inc. 11

The DSP1627 supports prioritized, vectored interrupts and a trap. The device has eight internal hardware sources of program interrupt and two external interrupt pins. Additionally, there is a trap pin and a trap signal from the hardware development system (HDS). A software interrupt is available through the

icall

The Each of these sources of interrupt and trap has a unique vector address and priority assigned to it. DSP16A interrupt compatibility is not maintained.

The software interrupt and the traps are always enabled and do not have a corresponding bit in the ins register. Other vectored interrupts are enabled in the inc register (see Table 29, Interrupt Control (inc) Register) and monitored in the ins register (see Table 30, Interrupt Status (ins) Register). When the DSP1627 goes into an interrupt or trap service routine, the IACK pin is asserted. In addition, pins VEC[3:0] encode which interrupt/ trap is being serviced. Table 4 details the encoding used for VEC[3:0].

instruction is reserved for use by the HDS.

icall

instruction.

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Data Sheet

DSP1627 Digital Signal Processor March 2000

4 Hardware Architecture

CONTROL

ins (16) inc (16)

x (16)

16 x 16 MPY

SHIFT (–2, 0, 1, 2)

yh (16)

p (32)

yl (16)

(continued)

CACHE

cloop (7)

alf (16)

mwait (16)

DAU

SYS

ADDER

pc (16)

pt (16)

i (16)

MUX

j (16)

k (16)

pr (16) pi (16)

MUX

XAAU

BRIDGE

–1, 0, 1, 2

XDB

XAB

IDB

YDB

YAAU

MUX

ALU/SHIFT

a0 (36) a1 (36)

EXTRACT/SAT

c0 (8)

c1 (8) c2 (8)

auc (16) psw (16)

re (16)

CMP

ybase (16)

Figure 4. DSP1600 Core Block Diagram

ADDER

YAB

rb (16)

MUX

r0 (16) r1 (16) r2 (16) r3 (16)

5-1741 (F).b

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Data Sheet March 2000 DSP1627 Digital Signal Processor

4 Hardware Architecture

Table 3. DSP1600 Core Block Diagram Legend

Symbol Name

16 x 16 MPY 16-bit x 16-bit Multiplier.

a0—a1

alf AWAIT, LOWPR, Flags.

ALU/SHIFT Arithmetic Logic Unit/Shifter.

auc Arithmetic Unit Control.

c0—c2 Counters 0—2.

cloop Cache Loop Count.

CMP Comparator.

DAU Digital Arithmetic Unit.

i Increment Register for the X Address Space.

IDB Internal Data Bus.

inc Interrupt Control. ins Interrupt Status.

j Increment Register for the Y Address Space.

k Increment Register for the Y Address Space.

MUX Multiplexer.

mwait External Memory Wait-states Register.

p Product Register (16-bit halves specified as p, pl).

PC Program Counter.

pi Program Interrupt Return Register. pr Program Return Register.

psw Processor Status Word.

pt X Address Space Pointer.

r0—r3 Y Address Space Pointers.

rb Modulo Addressing Register (begin address ). re Modulo Addressing Register (end addres s).

SYS System Cache and Control Section.

x Multiplier Input Register.

XAAU X Space Address Arithmetic Unit.

XAB X Space Address Bus. XDB X Space Data Bus.

YAAU Y Space Address Arithmetic Unit.

YAB Y Space Address Bus. YDB Y Space Data Bus.

ybase Direct Addressing Base Register.

y DAU Register (16-bit halves sp ec ifi ed as y, yl ).

* F3 ALU instructions with immediates require specifying the high half of the accumulators as a0h and a1h.

Accumulators 0 and 1 (16-bit halves specified as a0, a0l, a1, and a1l)

(continued)

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4 Hardware Architecture

Interruptibility

Vectored interrupts are serviced only after the execution of an interruptible instruction. If more than one vectored interrupt is asserted at the same time, the interrupts are serviced sequentially according to their assigned priorities. See Table 4 for the priorities assigned to the vectored interrupts. Interrupt service routines, branch and conditional branch instructions, cache loops, and instructions that only decrement one of the RAM pointers, r0 to r3 (e.g., *r3

A trap is similar to an interrupt, but it gains control of the processor by branching to the trap service routine even when the current instruction is noninterruptible. It may not be possible to return to normal instruction execution from the trap service routine since the machine state cannot always be saved. In particular, program execution cannot be continued from a trapped cache loop or interrupt service routine. While in a trap service routine, another trap is ignored.

When set to 1, the status bits in the ins register indicate that an interrupt has occurred. The processor must reach an interruptible state (completion of an interruptible instruction) before an enabled vectored interrupt will be acted on. An interrupt will not be serviced if it is not enabled. Polled interrupt service can be implemented by disabling the interrupt in the inc register and then polling the ins register for the expected event.

Vectored Interrupts

Tables 29 and 30 show the inc and ins registers. A logic 1 written to any bit of inc enables (or unmasks) the associated interrupt. If the bit is cleared to a logic 0, the interrupt is masked. Note that neither the software interrup t nor traps can be masked.

The occurrence of an interrupt that is not masked will cause the program execution to transfer to the memory location pointed to by that interrupt's vector address, assuming no other interrupt is being serviced (see Table 4, Interrupt Vector Table). The occurrence of an interrupt that is masked causes no automatic processor action, but will set the corresponding status bit in the ins register. If a masked interrupt occurs, it is latched in the ins register, but the interrupt is not taken. When unlatched, this latched interrupt will initiate automatic processor interrupt action. See the

Digital Signal Processor Information Manual

detailed description of the interrupts.

− −

), are not interruptible.

(continued)

DSP1611/17/18/27

for a more

Signaling Interrupt Service Status

Five pins of DSP1627 are devoted to signaling interrupt service status. The IACK pin goes high while any interrupt or user trap is being serviced, and goes low when the iretur n instruct ion fr om the se rvice ro utine is issued. Four pins, VEC[3:0], carry a code indicating which of the interrupts or trap is being serviced. Table 4 contains the encodings used by each interrupt.

Traps due to HDS breakpoints have no effect on either the IACK or VEC[3:0] pins. Instead, they show the interrupt state or interrupt source of the DSP when the trap occurred.

Clearing Interrupts

The PHIF interrupts (PIBF and POBE) are cleared by reading or writing the parallel host interface data transmit registers pdx0[in] and pdx0[out], respectively. The SIO and SIO2 interrupts (IBF, IBF2, OBE, and OBE 2) are cleared by reading or writing, as appropriate, the serial data registers sdx[in], sdx2[in], sdx[out], and sdx2[out]. The JTAG interrupt (JINT) is cleared by reading the jtag register.

Three of the vectored interrupts are cleared by writing to the ins register. Writing a 1 to the INT0, INT1, or TIME bits in the ins will cause the corresponding interrupt status bit to be cleared to a logic 0. The status bit for these vectored interrupts is also cleared when the ireturn instruction is executed, leaving set any other vectored interrupts that are pending.

Traps

The TRAP pin of the DSP1627 is a bidirectional signal. At reset, it is configured as an input to the processor. Asserting the TRAP pin will force a user trap. The trap mechanism is used for two purposes. It can be used by an application to rapidly gain control of the processor for asynchronous tim e-cr it ical event hand li ng (typi c all y for catastrophic error recovery). It is also used by the HDS for breakpointing and gaining control of the processor. Separate vectors are provided for the user trap (0x46) and the HDS trap (0x3). Traps are not maskable.

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Data Sheet March 2000 DSP1627 Digital Signal Processor

4 Hardware Architecture

Table 4. Interrupt Vector Table

Source Vector Priority VEC[3:0] Issued by

No Interrupt — — 0x0 —

Software Interrupt 0x2 1 0x1 icall

INT0 0x1 2 0x2 pin

JINT 0x42 3 0x8 jtag in

INT1 0x4 4 0x9 pin

TIME 0x10 7 0xc timer

IBF2 0x14 8 0xd SIO2 in

OBE2 0x18 9 0xe SIO2 out Reserved 0x1c 10 0x0 — Reserved 0x20 11 0x1 — Reserved 0x24 12 0x2 —

IBF 0x2c 14 0x3 SIO in

OBE 0x30 15 0x4 SIO out

PIBF 0x34 16 0x5 PHIF in

POBE 0x38 17 0x6 PHIF out

TRAP from HDS 0x3 18 TRAP from User 0x46 19 = highest 0x7 pin

* Traps due to HDS breakpoints have no effect on VEC[3:0] pins.

(continued)

—

breakpoint, jtag, or pin

A trap has four cycles of latency. At most, two instructions will execute from the time the trap is received at the pin to when it gains control. An instruction that is executing when a trap occurs is allowed to complete before the trap service routine is entered. (Note that the instruction could be lengthened by wait-states.) During normal program execution, the pi register contains either the address of the next instruction (two-cycle instruction executing) or the address following the next instruction (one-cycle instruction executing). In an interrupt service routine, pi contains the interrupt return address. When a trap occurs during an interrupt service routine, the value of the pi register may be overwritten. Specifically, it is not possible to return to an interrupt service routine from a user trap (0x46) service routine. Continuing program execution when a trap occurs du ring a cache loop is also not possible.

The HDS trap causes circuitry to force the program memory map to MA P1 (with on-chi p ROM starting at address 0x0) when the trap is taken. The previous memory map is restored when the trap service routine exits by issuing an ireturn. The map is forced to MAP1 because the HDS code, if present, resides in the on-chip ROM.

Using the Lucent Technologies development tools, the TRAP pin may be configured to be an output, or an input vectoring to address 0x3. In a multiprocessor environment, the TRAP pins of all the DSPs present can be tied together. During HDS operations, one DSP is selected by the host software to be the master. The master processor's TRAP pin is configured to be an output.

The TRAP pins of the slave processors are configured as inputs. When the master processor reaches a breakpoint, the master's TRAP pin is asserted. The slave processors will respond to their TRAP input by beginning to execute the HDS code.

AWAIT Interrupt (Standby or Sleep Mode)

Setting the AWAIT bit (bit 15) of the alf register (alf = 0x8000) caus es th e proc esso r to go in to a po wer saving standby or sleep mode. Only the minimum circuitry on the chip required to process an incoming interrupt remains active. After the AWAIT bit is set, one additional instruction will be executed before the standby power-s av in g m ode is ent e re d. A PH IF or SI O w or d transfer will complete if already in progress. The AWAIT bit is reset when the first interrupt occurs. The chip then wakes up and continues executing.

nop

Two AWAIT bit is set. The first cuted before sleeping; the second will be executed after the interrupt signal awakens the DSP and before the interrupt service routine is executed.

The AWAIT bit should be set from within the cache if the code which is executing resides in external ROM where more than one wait-state has been programmed. This ensures that an interrupt will not disturb the device from completely entering the sleep state.

instructions should be programmed after the

nop

(one cycle) will be exe-

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Data Sheet

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4 Hardware Architecture

For additional power savings, set ioc = 0x0180 and timerc = 0x0040 in addition to setting alf = 0x8000. This will hold the CKO pin low and shut down the timer and prescaler (see Table 38 and Table 31).

For a description of the control mechanisms for putting the DSP into low-power modes, see Section 4.13, Power Management.

(continued)

4.4 Memory Maps and Wait-States

The DSP1600 core implements a modified Harvard architecture that has separate on-chip 16-bit address and data buses for the instruction/coefficient (X) and data (Y) memory spaces. Table 5 shows the instruction/coefficient memory space maps for both the DSP1627x36 and DSP1627x32.

The differences between the x36 and x32 memory maps can be seen by comparing the respective MAP1 and MAP3. For instance, MAP1 of the x36 provides for 36 Kwords of IROM and 6 Kwords of dual-port RAM (DPRAM), whereas MAP1 of the x32 provides for 32 Kwords of IROM, 6 Kwords of DPRAM, and 16 Kwords of EROM.

The DSP1627 provides a multiplexed external bus which accesses external RAM (ERAM) and ROM (EROM). Programmable wait-states are provided for external memory accesses. The instruction/coefficient memory map is configurable to provide application flexibility. Table 6 shows the data memory space, which has one map.

Instruction/Coefficient Memory Map Selection

In determining which memory map to use, the processor evaluates the state of two parameters. The first is the LOWPR bit (bit 14) of the alf register. The LOWPR bit of the alf register is initialized to 0 automatically at reset. LOWPR controls the starting address in memory assigned to the six 1K banks of dual-port RAM. If LOWPR is low, internal dual-port RAM begins at address 0xC000. If LOWPR is high, internal dual-port RAM begins at address 0x0. LOWPR also moves IROM from 0x0 in MAP1 to 0x4000 in MAP3, and EROM from 0x0 in MAP2 to 0x4000 in MAP4.

The second parameter is the value at reset of the EXM pin (pin 27 or pin 14, depending upon the package type). EXM determines whether the internal 36 Kwords ROM (IROM) will be addressable in the memory map.

The Lucent Technologies development system tools, together with the on-chip HDS circuitry and the JTAG port, can independently set the memory map. Specifically, during an HDS trap, the memory map is forced to

16 Lucent Technologies Inc.

MAP1. The user's map selection is restored when the trap service routine has completed execution.

MAP1

MAP1 has the IROM starting at 0x0 and six 1 Kword banks of DPRAM starting at 0xC000. Additionally, MAP1 for the x32 has 16 Kwords of EROM starting at 0x8000. MAP1 is used if DSP1627 has EXM low at reset and the LOWPR parameter is programmed to zero. It is also used during an HDS trap.

MAP2

MAP2 differs from MAP1 in that the lowest 48 Kwords referenc e extern al ROM (ERO M). MAP2 i s used if EX M is high at reset, the LOWPR parameter is programmed to zero, and an HDS trap is not in progress.

MAP3

MAP3 has the six 1 Kword banks of DPRAM starting at address 0x0. In MAP3 of the x36, the 36 Kwords of IROM start at 0x4000. Similarly, for the x32, 32 Kwords of IROM start at 0x4000. Additionally, MAP3 for the x32 has 16 Kwords of EROM starting at 0xC000. MAP3 is used if EXM is low at reset, the LOWPR bit is programmed to 1, and an HDS trap is not in progress. Note that this map is not available if the secure mask-programmable option has been ordered.

MAP4

MAP4 differs from MAP3 in that addresses above 0x4000 reference external ROM (EROM). This map is used if the LOWPR bit is programmed to 1, an HDS trap is not in progress, and, either EXM is high during reset, or the secure mask-programmable option has been ordered.

Whenever the chip is reset using the RSTB pin, the default memory map will be MAP1 or MAP2, depending upon the state of the EXM pin at reset. A reset through the HDS will not reinitialize the alf register, so the previous memory map is retained.

Boot from External ROM

After RSTB goes from low to high, the DSP1627 comes out of reset and fetches an instruction from address zero of the inst ruction/coefficient space. The physical location of address zero is determined by the memory map in effect. If EXM is high at the rising edge of RSTB, MAP2 is selected. MAP2 has EROM at location zero; thus, program execution begins from external memory. If EXM is high and INT1 is low when RSTB rises, the mwait register defaults to 15 wait-states for all external memory segments. If INT1 is high, the mwait register defaults to 0 wait-states.

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Data Sheet March 2000 DSP1627 Digital Signal Processor

4 Hardware Architecture

(continued)

Table 5. Instruction/Coefficient Memory Maps DSP1627x36

X Address AB[0:15] MAP 1

EXM = 0

LOWPR = 0

00x0000

4K 0x1000

IROM

(36K)

†

MAP 2

EXM = 1

LOWPR = 0

EROM

(48K)

LOWPR = 1

DPRAM

6K 0x1800 Reserved

12K 0x3000

MAP 3

EXM = 0

(6K)

(10K)

‡

LOWPR = 1

Reserved

16K 0x4000 IROM 20K 0x5000

(36K)

24K 0x6000 28K 0x7000 32K 0x8000 36K 0x9000 Reserved 40K 0xA000

(12K) 44K 0xB000 48K 0xC000 DPRAM 52K 0xD000 Reserved

(6K) 54K 0xD800 Reserved 56K 0xE000

(10K)

DPRAM

(6K)

Reserved

(10K)

(12K)

60K—64K 0xFFFF

* MAP1 is set automatically during an HDS trap. The user-selected map is restored at the end of the HDS trap service routine. † LOWPR is an alf register bit. The Lucent Technologies development system tools can independently set the memory map. ‡ MAP3 is not available if the secure mask-programmable option is selected.

MAP 4

EXM = 1

DPRAM

(6K)

(10K)

EROM

(48K)

DSP1627x32

X Address AB[0:15] MAP 1

EXM = 0

LOWPR = 0

0 0x0000

4K 0x1000

IROM (32K)

†

MAP 2

EXM = 1

LOWPR = 0

EROM

(48K)

LOWPR = 1

6K 0x1800 Reserved

12K 0x3000

DPRAM

MAP 3

EXM = 0

(6K)

(10K)

‡

LOWPR = 1

Reserved

16K 0x4000 IROM 20K 0x5000

(32K)

24K 0x6000 28K 0x7000 32K 0x8000 EROM 36K 0x9000

(16K) 40K 0xA000 44K 0xB000 48K 0xC000 DPRAM 52K 0xD000

(6K)

54K 0xD800 Reserved 56K 0xE000

(10K)

DPRAM

(6K)

Reserved

(10K)

EROM

(16K)

60K—64K 0xFFFF

MAP 4

EXM = 1

DPRAM

(6K)

(10K)

EROM

(48K)

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Data Sheet

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4 Hardware Architecture

Data Memory Mapping Table 6. Data Memory Map (Not to Scale)

Decimal

Address

0 0x0000 DPRAM[1:6]

6K 0x1800 Reserved

16K 0x4000 IO

Address in

r0, r1, r2, r3

(continued)

Segment

4.5 External Memory Interface (EMI)

The external memory interface supports read/write operations from instruction/coefficient memory, data memory, and memory-mapped I/O devices. The DSP1627 provides a 16-bit external address bus, AB[15:0], and a 16-bit external data bus, DB[15:0]. These buses are multiplexed between the internal buses for the instruction/coefficient memory and the data memory. Four external memory segment enables, ERAMLO, IO, ERAMHI, and EROM, select the external memory segment to be addressed.

If a data memory location with an address between 0x4100 and 0x7FFF is addressed, ERAMLO is asserted low.

(10K)

If one of the 256 external data memory locations, with an address greater than or equal to 0x4000, and less than or equal to 0x40FF, is addressed, IO is asserted low. IO is intended for memory-mapped I/O.

If a data memory location with an address greater than or equal to 0x8000 is addressed, ERAMHI is asserted low. When the external instruction/coefficient memory is addressed, EROM is asserted low.

16,640 0x4100 E RA MLO

32K 0x8000 ERAMHI

64K – 1 0xFFFF

On the data memory side (see Table 6), the six 1K banks of dual-port RAM are located starting at address

0. Addresses from 0x4000 to 0x40FF reference a 256word memory-mapped I/O segment (IO). Addresses from 0x4100 to 0x7FFF reference the low external data RAM segment (ERAMLO). Addresses above 0x8000 reference high external data RAM (ERAMHI).

Wait-States

The number of wait-states (from 0 to 15) used when accessing each of the four external memory segments (ERAMLO, IO, ERAMHI, and EROM) is programmable in the mwait register (see Table 36). When the program references memory in one of the four external segments, the internal multiplexer is automatically switched to the appropriate set of internal buses, and the associated external enable of ERAMLO, IO, ERAMHI, or EROM is issued. The external memory cycle is automatically stretched by the number of wait-states configured in the appropriate field of the mwait register.

The flexibility provided by the programmable options of the external memory interface (see Table 36, mwait Register and Table 38, ioc Register) allows the DSP1627 to interface g luelessly with a variety of commercial memory chips.

Each of the four external memory segments, ERAMLO, IO, ERAMHI, and EROM, has a number of wait-states that is programmable (from 0 to 15) by writing to the mwait register. When the program references memory in one of the four external segments, the internal multiplexer is automatically switched to the appropriate set of internal buses, and the associated external enable of ERAMLO, IO, ERAMHI, or EROM is issued. The external memory cycle is automatically stretched by the number of wait-states in the appropriate field of the mwait register.

When writing to external memory, the RWN pin goes low for the external cycle. The external data bus, DB[15:0], is driven by the DSP1627 starting halfway through the cycle. The data driven on the external data bus is automatically held after the cycle unless an external read cycle immediately follows.

The DSP1627 has one external address bus and one external data bus for both memory spaces. Since some instructions provide the capability of simultaneous access to both X space and Y space, some provision must be made to avoid collisions for external accesses. The DSP1627 has a sequencer that does the external X access first, and then the external Y access, transparently to the programmer. Wait-states are maintained as

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Data Sheet March 2000 DSP1627 Digital Signal Processor

4 Hardware Architecture

programmed in the mwait register. For example, let two instructions be executed: the first reads a coefficient from EROM and writes data to ERAM; the second reads a coefficient from EROM and reads data from ERAM. The sequencer carries out the following steps at the external memory interface: read EROM, write ERAM, read EROM, and read ERAM. Each step is done in sequential one-instruction cycle steps, assuming zero waitstates are programmed. Note that the number of instruction cy cles taken by th e two in str uct ions is four . Also, in this case, the write hold time is zero.

The DSP1627 allows writing into external instruction/ coefficient memory. By setting bit 11, WEROM, of the ioc register (see Table 38), writing to (or reading from) data memory or memory-mapped I/O asserts the EROM strobe instead of ERAMLO, IO, or ERAMHI. Therefore, with WEROM set, EROM appears in both Y space (replacing ERAM) and X space, in its normal position.

Bit 14 of the ioc register (see Table 38), EXTROM, may be used with WEROM to download to a full 64K of external memory. When WEROM and EXTROM are both asserted, address bit 15 (AB15) is held low, aliasing the upper 32K of external memory into the lower 32K.

When an access to internal memory is made, the AB[15:0] bus holds the last valid external memory address. Asserting the RSTB pin low 3-states the AB[15:0] bus. After reset, the AB[15:0] value is undefined.

(continued)

4.6 Bit Manipulation Unit (BMU)

The BMU interfaces directly to the main accumulators in the DAU providing the following features:

■

Barrel shifting—logical and arithmetic, left and right shift

■

Normalization and extraction of exponent

■

Bit-field extraction and insertion

These features increase the efficiency of the DSP in applications such as control or data encoding and decoding. For example, data packing and unpacking, in which short data words are packed into one 16-bit word for more efficient memory storage, is very easy.

In addition, the BMU provides two auxiliary accumulators, aa0 and aa1. In one instruction cycle, 36-bit data can be shuffled, or swapped, between one of the main accumulators and one of the alternate accumulators. The ar<0—3> registers are 16-bit registers that control the operations of the BMU. They store a value that determines the amount of shift or the width and offset fields for bit extraction or insertion. Certain operations in the BMU set flags in the DAU psw register and the alf register (see Table 26, Processor Status Word (psw) Register, and Table 35, alf Register). The ar<0—3> registers can also be used as general-purpose registers.

The BMU instructions are detailed in Section 5.1. For a thorough description of the BMU, see the

18/27 Digital Signal Processor Information Manual

DSP1611/17/

The leading edge of the memory segment enables can be delayed by approximately one-half a CKO period by programming the ioc register (see Table 38). This is used to avoid a situation in which two devices drive the data bus simultaneously.

Bits 7, 8, and 13 of the ioc register select the mode of operation for the CKO pin (see Table 38). Available options are a free-running unstretched clock, a wait-stated sequenced clock (runs through two complete cycles during a sequenced external memory access), and a wait-stated clock based on the internal instruction cycle. These clocks drop to the low-speed internal ring oscillator when SLOWCKI is enabled (see 4.13, Power Management). The high-to-low transitions of the wait-stated clock are synchronized to the high-to-low transition of the free-running clock. Also, the CKO pin provides either a continuously high level, a continuously low level, or changes at the rate of the internal processor clock. This last option, only available with the crystal and small-signal input clock options, enables the DSP1627 CKI input buffer to deliver a full-rate clock to other devices while the DSP1627 itself is in one of the low-power modes.

4.7 Serial I/O Units (SIOs)

The serial I/O ports on the DSP1627 device provide a serial interface to many codecs and signal processors with little, if any, external hardware required. Each highspeed, double-buffered port (sdx and sdx2) supports back-to-back transmissions of data. SIO and SIO2 are identical. The output buffer empty (OBE and OBE2) and input buffer full (IBF and IBF2) flags facilitate the reading and/or writing of each serial I/O port by programor interrupt-driven I/O. There are four selectable active clock speeds.

A bit-reversal mode provi des comp atib ility with either the most significant bit (MSB) first or least significant bit (LSB) first serial I/O formats (see Table 22, Serial I/O Control Registers (sioc and sioc2)). A multiprocessor I/O configuration is supported. This feature allows up to eight DSP161X devices to be connected together on an SIO port without requiring external glue logic.

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Data Sheet

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4 Hardware Architecture

The serial data may be internally looped back by setting the SIO loopback control bit, SIOLBC, of the ioc register. SIOLBC affects both the SIO and SIO2. The data output signals are wrapped around internally from the output to the input (DO1 to DI1 and DO2 to DI2). To exercise loopback, the SIO clocks (ICK1, ICK2, OCK1, and OCK2) should either all be in the active mode, 16-bit condition, or each pair should be driven from one external source in passive mode. Similarly, pins ILD1 (ILD2) and OLD1 (OLD2) must both be in active mode or tied together and driven from one external frame clock in passive mode. During loopback, DO1, DO2, DI1, DI2, ICK1, ICK2, OCK1, OCK2, ILD1, ILD2, OLD1, OLD2, SADD1, SADD2, SYNC1, SYNC2, DOEN1, and DOEN2 are 3-stated.

Setting DODLY = 1 (sioc and sioc2) delays DO by one phase of OCK so that DO changes on the falling edge of OCK instead of the rising edge (DODLY = 0). This reduces the time available for DO to drive DI and to be valid for the rising edge of ICK, but increases the hold time on DO by half a cycle on OCK.

Programmable Modes

Programmable modes of operation for the SIO and SIO2 are controlled by the serial I/O control registers (sioc and sioc2). These registers, shown in Table 22, are used to set the ports into various configurations. Both input and output operations can be independently configured as either active or passive. When active, the DSP1627 generates load and clock signals. When passive, load and clock signal pins are inputs.

Since input and output can be independently configured, each SIO has four different modes of operation. Each of the sioc registers is also used to select the frequency of active clocks for that SIO. Finally, these registers are used to configure the serial I/O data formats. The data can be 8 or 16 bits long, and can also be input/ output MSB first or LSB first. Input and output data formats can be independently configured.

Multiprocessor Mode

The multiprocessor mode allows up to eight processors (DSP1629, DSP1628, DSP1627, DSP1620, DSP1618, DSP1617, DSP1616, DSP1611) to be connected together to provide data transmission among any of the DSPs in the system. Either SIO port (SIO or SIO2) may be independently used for the multiprocessor mode. The multiprocessor interface is a four-wire interface, consisting of a data channel, an address/protocol channel, a transmit/receive clock, and a sync signal (see Figure 5). The DI1 and DO1 pins of all the DSPs are connected to transmit and receive the data channel. The SADD1 pins of all the DSPs are connected to trans-

20 Lucent Technologies Inc.

(continued)

mit and receive the address/protocol channel. ICK1 and OCK1 should be tied together and driven from one source. The SYNC1 pins of all the DSPs are connected.

In the configuration shown in Figure 5, the master DSP (DSP0) generates active SYNC1 and OCK1 signals while the slave DSPs use the SYNC1 and OCK1 signals in passive mode to synchronize operations. In addition, all DSPs must have their ILD1 and OLD1 signals in active mode.

While ILD1 and OLD1 are not required externally for multiprocessor operation, they are used internally in the DSP's SIO. Setting the LD field of the master's sioc register to a logic level 1 will ensure that the active generation of SYNC1, ILD1, and OLD1 is derived from OCK1 (see Table 22). With this configuration, all DSPs should use ICK1 (tied to OCK1) in passive mode to avoid conflicts on th e cloc k (CK) l ine (s ee th e

Digital Signal Processor Information Manual

information). Four registers (per SIO) configure the multiprocessor

mode: the time-division multiplexed slot register (tdms or tdms2), the serial receive and transmit address register (srta or srta2), the serial data transmit register (sdx or sdx2), and the multiprocessor serial address/protocol register (saddx or saddx2).

Multiprocessor mode requires no external logic and uses a TDM interface with eight 16-bit time slots per frame. The transmission in any time slot consists of 16 bits of serial data in the data channel and 16 bits of address and protocol information in the address/protocol channel. The address information consists of the transmit address field of the srta register of the transmitting device. The address information is transmitted concurrently with the transmission of the first 8 bits of data. The protocol information consists of the transmit protocol field written to the saddx register and is transmitted concurrently with the last 8 bits of data (see Table 25, Multiprocessor Protocol Register). Data is received or recognized by other DSP(s) whose receive address matches the address in the address/protocol channel. Each SIO port has a user-programmable receive address and transmit address associated with it. The transmit and receive addresses are programmed in the srta register.

In multiprocessor mode, each device can send data in a unique time slot designated by the tdms register transmit slot field (bits 7—0). The tdms register has a fully decoded transmit slot field in order to allow one DSP1627 device to transmit in more than one time slot. This procedure is useful for multiprocessor systems with less than eight DSP1627 devices when a higher bandwidth is necessary between certain devices in that system. The DSP operating during time slot 0 also drives SYNC1.

DSP1611/17/18/27

for more

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Data Sheet March 2000 DSP1627 Digital Signal Processor

4 Hardware Architecture

(continued)

In order to prevent multiple bus drivers, only one DSP can be programmed to transmit in a particular time slot. In addition, it is important to note that the address/protocol channel is 3-stated in any time slot that is not being driven.

Therefore, to prevent spurious inputs, the address/protocol channel should be pulled up to V

with a 5 kΩ re-

sistor, or it should be guaranteed that the bus is driven in every time slot. (If the SYNC1 signal is externally generated, then this pull-up is required for correct initialization.)

Each SIO also has a fully decoded transmitting address specified by the srta register transmit address field (bits 7—0). This is used to transmit information regarding the destination(s) of the data. The fully decoded receive address specified by the srta register receive address field (bits 15—8) determines which data will be received.

The SIO protocol channel data is controlled via the saddx register. When the saddx register is written, the

lower 8 bits contain the 8-bit protocol field. On a read, the high-order 8 bits read from saddx are the most recently received protocol field sent from the transmitting DSP's saddx output register. The low-order 8 bits are read as 0s.

An example use of the protocol channel is to use the top 3 bits of the saddx value as an encoded source address for the DSPs on the multiprocessor bus. This leaves the remaining 5 bits available to convey additional control information, such as whether the associated field is an opcode or data, or whether it is the last word in a transfer, etc. Th ese bits c an also be us ed to transf er parit y information about the data. Alternatively, the entire field can be used for data transmission, boosting the bandwidth of the port by 50%.

Using SIO2

The SIO2 functions the same as the SIO. Please refer to Pin Multiplexing in Section 4.1 for a description of pin multiplexing of BIO, PHIF, VEC[3:0], and SIO2.

DSP 0

ICK

OCK

SADD

SYNC

DATA CHANNEL

CLOCK

ADDRESS/PROTOCOL CHANNEL

SYNC SIGNAL

Figure 5. Multiprocessor Communication and Connections

DSP 1

ICK

OCK

SADD

SYNC

DSP 7

ICK

OCK

SADD

SYNC

Ω

5 k

5-4181 (F).a

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Data Sheet

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4 Hardware Architecture

(continued)

4.8 Parallel Host Interface (PHIF)

The DSP1627 has an 8-bit parallel host interface for rapid transfer of data with external devices. This parallel port is passive (data strobes provided by an external device) and supports either tocols. The PHIF also provides for 8-bit or 16-bit data transfers. As a flexible hos t int erf ac e, it requires little or no glue logic to interface to other devices (e.g., microcontrollers, microprocesso rs , o r another DSP).

The data path of the PHIF consists of a 16-bit input buff-

pdx0

er, output pins, parallel input buffer full (PIBF) and parallel output buffer empty (POBE), indicate the state of the buffers. In addition, there are two registers used to control and monitor the PHIF's operation: the parallel host interface control register ( PHIF status register (PSTAT, see Table 8). The PSTAT register, which reflects the state of the PIBF and POBE flags, can only be read by an external device when the PSTAT input pin is asserted. The the programmable optio ns fo r th is port .

The function of the pins, PIDS and PODS, is programmable to support both the pin, PCSN, is an input that, when low, enables PIDS and PODS (or PRWN and PDS, depending on the protocol used). While PCSN is high, the DSP1627 ignores any activity on PIDS and/or PODS. If a DSP1627 is intended to be continuously accessed through the PHIF port, PCSN should be grounded. If PCSN is low and their respective bits in the PODS by an external device causes the DSP1627 device to recognize an interru pt .

Programmability

(in), and a 16-bit output bu ffer,

inc

Motorola

Intel

microcontroller pro-

phifc

, see Table 28), and the

phifc

Intel

and

Motorola

pdx0

(out). Tw o

protocols. The

register. Setting PMODE selects 16-bit transfer mode. An input pin controlled by the host, PBSEL, determines an access of either the high or low bytes. The assertion level of the PBSEL input pin is configurable in software using bit 3 of the marizes the port's functionality as controlled by the PSTAT and PBSEL pins and the PBSELF and PMO DE fields.

For 16-bit transfers, if PBS ELF is zero, the PIBF and POBE flags are set after the high byte is transferred. If PBSELF is one, the flags a re s et after the low byte is transferred. In 8-bit mode, only the low byte is accessed, and every completion of an input or output access sets PIBF or POBE.

Bit 1 of the to operate either with an chip select (PCSN) and either of the data strobes (PIDS or PODS) are needed to make an access, or with a

torola

protocol where the chip se lec t (PC SN ), a data strobe (PDS), and a read/write strobe (PRWN) are needed. PIDS and PODS are negative assertion data strobes while the assertion level o f PDS is programmable through bit 2, PSTRB, of the

Finally, the assertion leve l of th e out put pins, PIBF and POBE, is controlled through bit 4, PFLAG. When PFLAG is set low, PIBF and POBE output pins have positive assertion levels. By setting bit 5, PF LAGSEL, the logical OR of PIBF and POBE flags (positive assertion) is seen at the output pin PIBF. By setting bit 7 in the polarity of the POBE fla g in t he s t at us register, PSTAT, can be changed. PSOBEF has no effect on the POBE pin.

Pin Multiplexing

Please refer to Pin Multiplex ing in Section 4.1 for a description of BIO, PHIF, VE C [3 :0 ], and SIO2 pins.

phifc

Intel

protocol where only the

phifc

Mo-

, PSOBEF,

The parallel host interfac e c an be programmed for 8-bit or 16-bit data transfers using bit 0, PMODE, of the

phifc

Table 7. PHIF Function (8-bit and 16-bit Modes)

PMODE Field PSTAT Pin PBSEL Pin PBSELF Field = 0 PBSELF Field = 1

0 (8-bit) 0 0 pdx0 low byte reserved

0 0 1 reserved pdx0 low byte 010PSTATreserved 0 1 1 reserved PSTAT

1 (16-bit) 0 0 pdx0 low byte pdx0 high byte

1 0 1 pdx0 high byte pdx0 low byte 110PSTATreserved 1 1 1 reserved PSTAT

Table 8. pstat Register as Seen on PB[7:0]

Bit

Field

76543 2 1 0

RESERVED PIBF POBE

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Data Sheet March 2000 DSP1627 Digital Signal Processor

4 Hardware Architecture

(continued)

4.9 Bit Input/Output Unit (BIO)

The BIO controls the directions of eight bidirectional control I/O pins, IOBIT[7:0]. If a pin is configured as an output, it can be individually set, c leared, or toggled. If a pin is configured as an input , it ca n be read and/or tested.

The lower half of the current values (VALUE[7:0]) of the eight bidirectional pins IOBIT[7:0]. The uppe r half of th e REC[7:0]) controls the direction of each of the pins. A logic 1 configures the corresponding pin as an output; a logic 0 configures it as an input. The upper half of the ister is cleared upon reset .

cbit

The MODE/MASK[7:0] and DATA/PAT[7:0]. The values of DATA/PAT[7:0] are cleared upon reset. The meaning of a bit in either field depends on w hether it has been configured as an input or an output in figured to be an output, th e m eanings are MODE and DATA. For an input, the m eanings are MASK and PAT (pattern). Table 9 show s the functionality of the MOD E/ MASK and DATA/PAT bit s bas ed on the direction selected for the associated IOBIT pin.

Those bits that have been configured as inputs can be individually tested for 1 or 0. For those inputs that are being tested, there are four flags produced: allt (all true), allf (all false), somet (some true), and somef (some false). These flags can be used for cond it ional branch or special instructions. The state of these flags can be saved and restored by reading and writing bits 0 to 3 of the (see Table 35).

sbit

. If a pin has been con-

alf

sbit

reg-

4.10 Timer

The interrupt timer is composed of the timerc (control) register, the timer0 register, the prescaler, and the counter itself. The timer control register (see Table 31, timerc Register) sets up the operational state of the timer and prescaler. The timer0 register is used to hold the counter reload value (or period register) and to set the initial value of the counter. The prescaler slows the clock to the timer by a number of binary divisors to allow for a wide range of interrupt delay periods.

The counter is a 16-bit down counter that can be loaded with an arbitrary number from software. It counts down to 0 at the clock rate provided by the prescaler. Upon reaching 0 count, a vectored interrupt to program address 0x10 is issued to the DSP1627, providing the interrupt is enabled (bit 8 of inc and ins registers). The counter will then either wait in an inactive state for another command from software, or will automatically repeat the last interrupting period, depending upon the state of the RELOAD bit in the timerc register.

When RELOAD is 0, the counter counts down from its initial value to 0, interrupts the DSP1627, and then stops, remaining inactive until another value is written to the timer0 register. Writing to the timer0 register causes both the counter and the period register to be written with the specified 16-bit number. When RELOAD is 1, the counter counts down from its initial value to 0, interrupts the DSP1627, automatically reloads the specified initial value from the period register into the counter, and repeats indefinitely. This provides for either a single timed interrupt event or a regular interrupt clock of arbitrary period.

Table 9. BIO Operations

DIREC[n]

MODE/

MASK[n]

DATA/

PAT[n]

Action

1 (Output) 0 0 Clear 1 (Output) 0 1 Set 1 (Output) 1 0 No Change 1 (Output) 1 1 Toggle

0 (Input) 0 0 No Test 0 (Input) 0 1 No Test 0 (Input) 1 0 Test for Zero 0 (Input) 1 1 Test for One

*0 ≤ n ≤ 7.

If a BIO pin is switched from being configured as an output to being configured as an input and then back to being configured as an output, the pin retains the previous

The timer can be stopped and started by software, and can be reloaded with a new period at any time. Its count value, at the time of the read, can also be read by software. Due to pipeline stages, stopping and starting the timer may result in one inaccurate count or prescaled period. When the DSP1627 is reset, the bottom 6 bits of the timerc register and the timer0 register and counter are initialized to 0. This sets the prescaler to CKO/2*, turns off the reload feature, disables timer counting, and initializes the timer to its inactive state. The act of resetting the chip does not cause a timer interrupt. Note that the period register is not initialized on reset.

The T0EN bit of the timerc register enables the clock to the timer. When T0EN is a 1, the timer counts down towards 0. When T0EN is a 0, the timer holds its current count.

output val ue.

Pin Multiplexing

Please refer to Pin Multiplexing in Section 4.1 for a description of BIO, PHIF, VEC[3:0], and SIO2 pins.

* Frequency of CKO/2 is equivalent to either CKI/2 for the PLL by-

passed or related to CKI by the PLL multiplying factors. See Section

4.12, Clock Synthesis.

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4 Hardware Architecture

(continued)

The PRESCALE field of the timerc register selects one of 16 possible clock rates for the timer input clock (see Table 31, timerc Register).

Setting the DISABLE bit of the timerc register to a logic 1 shuts down the timer and the prescaler for power savings. Setting the TIMERDIS, bit 4, in the powerc register has the same effect of shutting down the timer. The DISABLE bit and the TIMERDIS bit are cleared by writing a 0 to their respective registers to restore the normal operating mode.

4.11 JTAG Test Port

The DSP1627 uses a JTAG/ wire test port for self-test and hardware emulation. There is no separate TRST input pin. An instruction register, a boundary-scan register, a bypass register, and a device identification register have been implemented. The device identification register coding for the DSP1627 is shown in Table 37. The instruction register (IR) is 4 bits long. The instruction for accessing the device ID is 0xE (1110). The behavior of the instruction register is summarized in Table 10. Cell 0 is the LSB (closest to TDO).

IEEE

1149.1 standard four-

The first line shows the cells in the IR that capture from a parallel input in the capture-IR controller state. The second line shows the cells that always load a logic 1 in the capture-IR controller state. The third line shows the cells that always load a logic 0 in the capture-IR controller state. Cell 3 (MSB of IR) is tied to status signal PINT, and cell 2 is tied to status signal JINT. The state of these signals can therefore be captured during capture-IR and shifted out during SHIFT-IR controller states.

Boundary-Scan Register

All of the chip's inputs and outputs are incorporated in a JTAG scan path shown in Table 11. The types of boundary-scan cells are as follows:

■

I = input cell

■

O = 3-state output cell

■

B = bidirectional (I/O) cell

■

OE = 3-state control cell

■

DC = bidirectional control cell

Table 10. JTAG Instruction Register

IR Cell #: 3 2 1 0

Parallel Input? Y Y N N Always Logic 1? N N N Y Always Logic 0? N N Y N

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Data Sheet March 2000 DSP1627 Digital Signal Processor

4 Hardware Architecture

(continued)

Note that the direction of shifting is from TDI to cell 104 to cell 103 . . . to cell 0 of TDO.

Table 11. JTAG Boundary-Scan Register

Cell Type Signal Name/Function Cell Type Signal Name/Function

0 OE Controls cells 1, 27—31 69 B OCK2/PCSN* 1 O CKO 70 DC Controls cell 71 2IRSTB 71BDO2/PSTAT* 3 DC Controls cell 4 72 DC Controls cell 73 4 B TRAP 73 B SYNC2/PBSEL* 5I

STOP

†

74 DC Controls cell 75 6 O IACK 75 B ILD2/PIDS* 7 I INT0 76 DC Controls cell 77 8 OE Controls cells 6, 10—25, 49, 50, 78, 79 77 B OLD2/PODS* 9 I INT1 78 O IBF2/ PIBF*

10—25 O AB[0:15] 79 O OBE2/POBE*

26 I EXM 80 DC Controls cell 81

27 O RWN 81 B ICK2/PB0* 28—31 O EROM, ERAMLO, ERAMHI, IO 82 DC Controls cell 83 32—36 B DB[0:4] 83 B DI2/PB1*

37 DC Controls cells 32—36, 38—48 84 DC Controls cell 85 38—48 B DB[5:15] 85 B DOEN2/PB2*

49 O OBE1 86 DC Controls cell 87

50 O IBF1 87 B SADD2/PB3*

51 I DI1 88 DC Controls cell 89

52 DC Controls cell 53 89 B IOBIT0/PB4*

53 B ILD1 90 DC Controls cell 91

54 DC Controls cell 55 91 B IOBIT1/PB5*

55 B ICK1 92 DC Controls cell 93

56 DC Controls cell 57 93 B IOBIT2/PB6*

57 B OCK1 94 DC Controls cell 95

58 DC Controls cell 59 95 B IOBIT3/PB7*

59 B OLD1 96 DC Controls cell 97

60 OE Controls cell 61 97 B VEC3/IOBIT4*

61 O DO1 98 DC Controls cell 99

62 DC Controls cell 63 99 B VEC2/IOBIT5*

63 B SYNC1 100 DC Controls cell 101

64 DC Controls cell 65 101 B VEC1/IOBIT6*

65 B SADD1 102 DC Controls cell 103

66 DC Controls cell 67 103 B VEC0/IOBIT7*

67 B DOEN1 104 I

CKI

‡

68 DC Controls cell 69

* Please refer to Pin Multiplexing in Section 4.1 for a description of pin multiplexing of BIO, PHIF, VEC[3:0], and SIO2. † Note that shifting a zero into this cell in the mode to scan a zero into the chip will disable the processor clocks just as the STOP pin will. ‡ When the JTAG SAMPLE instruction is used, this cell will have a logic one regardless of the state of the pin.

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4 Hardware Architecture

4.12 Clock Synthesis

CKI INPUT CLOCK

CKI

÷ N

Nbits[2:0]

PHASE

DETECTOR

(continued)

RING

OSCILLATOR

LOCK

(FLAG TO INDICATE LOCK CONDITION OF PLL)

CHARGE

PUMP

÷ M

LOOP

FILTER

powerc

VCO

VCO CLOCK

VCO

SLOWCKI

SLOW CLOCK

÷ 2

PLLEN

INTERNAL

PROCESSOR

CKI

U X

CLOCK

INTERNAL CLOCK

PLLSEL

pllc

PLL/SYNTHESIZER

LF[3:0]Mbits[4:0]

Figure 6. Clock Source Block Diagram

The DSP1627 provides an on-chip, programmable clock synthesizer. Figure 6 is the clock source diagram. The 1X CKI input clock, the output of the synthesizer, or a slow internal ring oscillator can be used as the source for the internal DSP clock. The clock synthesizer is based on a phase-locked loop (PLL), and the terms clock synthesizer and PLL are used interchangeably.

On powerup, CKI is used as the clock source for the DSP. This clock is used to generate the internal processor clocks and CKO, where f

CKI

= f

. Setting the ap-

CKO

propriate bits in the pllc control register (described in Table 32) will enable the clock synthesizer to become the clock source. The powerc register, which is discussed in Section 4.13, can override the selection to stop clocks or force the use of the slow clock for lowpower operation.

5-4520 (F)

PLL Control Signals

The input to the PLL comes from one of the three maskprogrammable clock options: CMOS, crystal, or smallsignal. The PLL cannot operate without an external input clock.

To use the PLL, the PLL must first be allowed to stabilize and lock to the programmed frequency. After the PLL has locked, the LOCK flag is set and the lock detect circuitry is disabled. The synthesizer can then be used as the clock source. Setting the PLLSEL bit in the pllc register will switch sources from f

CKI

to f

/2 without

VCO

glitching. It is important to note that the setting of the pllc register must be maintained. Otherwise, the PLL will seek the new set point. Every time the pllc register is written, the LOCK flag is reset.

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Data Sheet March 2000 DSP1627 Digital Signal Processor

4 Hardware Architecture

The frequency of the PLL output clock, f

(continued)

, is deter-

VCO

mined by the values loaded into the 3-bit N divider and the 5-bit M divider. When the PLL is selected and locked, the frequency of the internal processor clock is related to the frequency of CKI by the following equations:

= f

CKI

* M/N

= f

CKO

VCO

= f

÷ 2

, must fall within the

VCO

must be at

VCO

INTERNAL CLOCK

The frequency of the VCO, f range listed in Table 63. Also note that f least twice f

CKI

The coding of the Mbits and Nbits is described as follows:

Mbits = M − 2 if (N == 1)

Nbits = 0x7

else

Nbits = N − 2 where N ranges from 1 to 8 and M ranges from 2 to 20. The loop filter bits LF[3:0] should be programmed ac-

cording to Table 64.

Two other bits in the pllc register control the PLL. Clearing the PLLEN bit powers down the PLL; setting this bit powers up the PLL. Clearing the PLLSEL bit deselects the PLL so that the DSP is clocked by a 1X version of the CKI input; setting the PLLSEL bit selects the PLLgenerated clock for the source of the DSP internal processor clock. The pllc register is cleared on reset and powerup. Therefore, the DSP comes out of reset with the PLL deselected and powered down. M and N should be changed only while the PLL is deselected. The values of M and N should not be changed when powering down or deselecting the PLL.

As previously mentioned, the PLL also provides a user flag, LOCK, to indicate when the loop has locked. When this flag is not asserted, the PLL output is unstable. The DSP should not be switched to the PLL-based clock without first checking that the lock flag is set. The lock flag is cleared by writing to the pllc register. When the PLL is deselected, it is necessary to wait for the PLL to relock before the DSP can be switched to the PLLbased clock. Before the input clock is stopped, the PLL should be powered down. Otherwise, the LOCK flag will not be reset and there may be no way to determine if the PLL is stable, once the input clock is applied again.

The lock-in time depends on the frequency of operation and the values programmed for M and N (see Table 64).

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Data Sheet

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4 Hardware Architecture

(continued)

PLL Programming Examples

The following section of code illustrates how the PLL would be initialized on powerup, assuming the following operating conditions:

■

CKI input frequency = 10 MHz

■

Internal clock and CKO frequency = 50 MHz

■

VCO frequency = 100 MHz

■

Input divide down count N = 2 (Set

■

Feedback down count M = 20 (Set

Nbits[2:0]

Mbits[4:0]

= 000 to get N = 2, as described in Table 32.) = 10010 to get M = 18 + 2 = 20, as described in Table 32.)

The device would come out of reset with the PLL disabled and deselected.

pllinit: pllc = 0x2912 /* Running CKI input clock at 10 MHz, set up counters in PLL */

pllc = 0xA912 /* Power on PLL, but PLL remains deselected */ call pllwait /* Loop to check for LOCK flag assertion */ pllc = 0xE912 /* Select high-speed, PLL clock */ goto start /* User's code, now running at 50 MHz */

pllwait: if lock return

goto pllwait

Programming examples which illustrate how to use the PLL with the various power management modes are listed in Section 4.13.

Latency

The switch between the CKI-based clock and the PLL-based clock is synchronous. This method results in the actual switch taking place several cycles after the PLLSEL bit is changed. During this time, actual code can be executed, but it will be at the previous clock rate. Table 12 shows the latency times for switching between CKI-based and PLLbased clocks. In the example given, the delay to switch to the PLL source is 1—4 CKO cycles and to switch back is 11—31 CKO cycles.

Table 12. Latency Times for Switching Between CKI and PLL-Based Clocks

Minimum Latency (Cycles) Maximum Latency (Cycles)

Switch to PLL-based clock 1 N + 2

Switch from PLL-based clock M/N + 1 M + M/N + 1

Frequency Accuracy and Jitter

When using the PLL to multiply the input clock frequency up to the instruction clock rate, it is important to realize that although the average frequency of the internal clock and CKO will have about the same relative accuracy as the input clock, noise sources within the DSP will produce jitter on the PLL clock such that each individual clock period will have some error associated with it. The PLL is guaranteed only to have sufficiently low jitter to operate the DSP, and thus, this clock should not be used as an input to jitter-sensitive devices in the system.

and V

DDA

The PLL has its own power and ground pins, V form of a ferrite bead connected from V a 0.01 µF ceramic) from V

Connections

SSA

to VSS. V

DDA

and V

DDA

to VDD and two decoupling capacitors (4.7 µF tantalum in parallel with

DDA

can be connected directly to the main ground plane. This recommen-

SSA

. Additional filtering should be provided for V

SSA

DDA

in the

dation is subject to change and may need to be modified for specific applications depending on the characteristics of the supply noise.

Note:

For devices with the CMOS clock input option, the CKI2 pin should be connected to V

SSA

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Data Sheet March 2000 DSP1627 Digital Signal Processor

4 Hardware Architecture

(continued)

4.13 Power Management

There are three different control mechanisms for putting the DSP1627 into low-power modes: the powerc control register, the STOP pin, and the AWAIT bit in the alf register. The PLL can also be disabled with the PLLEN bit of the pllc register for more power saving.

Powerc Control Register Bits

The powerc register has 10 bits that power down various portions of the chip and select the clock source:

XTLOFF:

crystal oscillator or the small-signal input circuit, disabling the internal processor clock. Assertion of the XTLOFF bit to disable the crystal oscillator also prevents its use as a noninverting buffer. Since the oscillator and the small-signal input circuits take many cycles to stabilize, care must be taken with the turn-on sequence, as described later.

SLOWCKI:

ring oscillator as the clock source for the internal processor clock instead of CKI or the PLL. When CKI or the PLL is selected, the ring oscillator is powered down. Switching of the clocks is synchronized so that no partial or short clock pulses occur. Two the instruction that sets or clears SLOWCKI.

NOCK:

off the internal processor clock, regardless of whether its source is provided by CKI, the PLL, or the ring oscillator. The NOCK bit can be cleared by resetting the chip with the RSTB pin, or asserting the INT0 or INT1 pins. Two The PLL remains running, if enabled, while NOCK is set.

INT0EN:

clear the NOCK bit, thereby allowing the device to continue program execution from where it left off without any loss of state. No chip reset is required. It is recommended that, when INT0EN is to be used, the INT0 interrupt be disabled in the inc register so that an unintended interrupt does not occur. After the program resumes, the INT0 interrupt in the ins register should be cleared.

INT1EN:

NOCK clear, exactly like INT0EN previously described. The following control bits power down the peripheral

I/O units of the DSP. These bits can be used to further reduce the power consumption during standard sleep mode.

Assertion of the XTLOFF bit powers down the

Assertion of the SLOWCKI bit selects the

nop

s should follow

Assertion of the NOCK bit synchronously turns

nop

s should follow the instruction that sets NOCK.

This bit allows the INT0 pin to asynchronously

This bit enables the INT1 pin to be used as the

SIO1DIS:

unit. It disables the clock input to the unit, thus eliminating any sleep power associated with the SIO1. Since the gating of the clocks may result in incomplete transactions, it is recommended that this option be used in applications where the SIO1 is not used or when reset may be used to reenable the SIO1 unit. Otherwise, the first transaction after reenabling the unit may be corrupted.

SIO2DIS:

way SIO1DIS powers down the SIO1.

PHIFDIS:

host interface. It disables the clock input to the unit, thus eliminating any sleep power associated with the PHIF. Since the gating of the clocks may result in incomplete transactions, it is recommended that this option be used in applications where the PHIF is not used, or when reset may be used to reenable the PHIF. Otherwise, the first transaction after reenabling the unit may be corrupted.

TIMERDIS:

the clock input to the timer unit. Its function is identical to the DISABLE field of the timerc control register. Writing a 0 to the TIMERDIS field will continue the timer operation.

Figure 7 shows a functional view of the effect of the bits of the powerc register on the clock circuitry. It shows only the high-level operation of each bit. Not shown are the bits that power down the peripheral units.

STOP Pin

Assertion (active-low) of the STOP pin has the same effect as setting the NOCK bit in the powerc register. The internal processor clock is synchronously disabled until the STOP pin is returned high. Once the STOP pin is returned high, program execution will continue from where it left off without any loss of state. No chip reset is required. The PLL remains running, if enabled, during STOP assertion.

The pllc Register Bits

The PLLEN bit of the pllc register can be used to power down the clock synthesizer circuitry. Before shutting down the clock synthesizer circuitry, the system clock should be switched to either CKI using the PLLSEL bit of pllc, or to the ring oscillator using the SLOWCKI bit of powerc.

This is a powerdown signal to the SIO1 I/O

This bit powers down the SIO2 in the same

This is a powerdown signal to the parallel

This is a timer disable signal which disables

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Data Sheet

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4 Hardware Architecture

CKI2

CKI

STOP

RSTB

XTLOFF

OSCILLATOR,

SMALL SIGNAL

MASK-PROGRAMMABLE

CMOS INPUT CLOCK

HW STOP

NOCK

CLEAR NOCK

OFF

CRYSTAL

CLOCK

OPTION

SW STOP

(continued)

PLLSEL

PLLEN

PLL

CKI

DEEP

SLEEP

DISABLE

RING

OSCILLATOR

VCO/2

SYNC.

MUX

SYNC.

GATE

INTERNAL CLOCK

SLOW CLOCK

DEEP

SLEEP

SLOWCKI

INT0

INT0EN

INT1

INT1EN

Notes: The functions in the shaded ovals are bits in the powerc control register. The functions in the nonshaded ovals are bits in the pllc control register.

Deep sleep is the state arrived at either by a hardware or software stop of the internal processor clock. The switching of the multiplexers and the synchronous gate is designed so that no partial clocks or glitching will occur. When the deep sleep state is entered with the ring oscillator selected, the internal processor clock is turned off before the ring oscillator is pow-

ered down. PLL select is the PLLSEL bit of pllc; PLL powerdown is the PLLEN bit of pllc.

INTERNAL

PROCESSOR

CLOCK

5-4124 (F).h

Figure 7. Power Management Using the powerc and the pllc Registers

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4 Hardware Architecture

Await Bit of the alf Register

Setting the AWAIT bit of the alf register causes the processor to go into the standard sleep state or power-saving standby mode. Operation of the AWAIT bit is the same as in the DSP1610, DSP1611, DSP1616, DSP1617, and DSP1618. In this mode, the minimum circuitry required to process an incoming interrupt remains active, and the PLL remains active if enabled. An interrupt will return the processor to the previous state, and program execution will continue. The action resulting from setting the AWAIT bit and the action resulting from setting bits in the powerc register are mostly independent. As long as the processor is receiving a clock, whether slow or fast, the DSP may be put into standard sleep mode with the AWAIT bit. Once the AWAIT bit is set, the STOP pin can be used to stop and later restart the processor clock, returning to the standard sleep state. If the processor clock is not running, however, the AWAIT bit cannot be set.

Power Management Sequencing

There are important considerations for sequencing the power management modes. Both the crystal oscillator and the small-signal clock input circuits have start-up delays which must be taken into account, and the PLL requires a delay to reach lock-in. Also, the chip may or may not need to be reset following a return from a lowpower state.

Devices with a crystal oscillator or small-signal input clocking option may use the XTLOFF bit in the powerc register to power down the on-chip oscillator or smallsignal circuitry, thereby reducing the power dissipation. When reenabling the oscillator or the small-signal circuitry, it is important to bear in mind that a start-up interval exists during which time the clocks are not stable.

(continued)

Two scenarios exist here:

1. Immediate Turn-Off, Turn-On with RSTB: This scenario applies to situations where the target device is not required to execute any code while the crystal oscillator or small-signal input circuit is powered down and where restart from a reset state can be tolerated. In this case, the processor clock derived from either the oscillator or the small-signal input is running when XTLOFF is asserted. This effectively stops the internal processor clock. When the system chooses to reenable the oscillator or small-signal input, a reset of the device will be required. The reset pulse must be of sufficient duration for the oscillator start-up interval to be satisfied. A similar interval is required for the small-signal input circuit to reach its dc operating point. A minimum reset pulse of 20 ms will be adequate. The falling edge of the reset signal, RSTB, will asynchronously clear the XTLOFF field, thus re-enabling the power to the oscillator or small-signal circuitry. The target DSP will then start execution from a reset state, following the rising edge of RSTB.

2. Running from Slow Clock While XTLOFF Active: The second scenario applies to situations where the device needs to continue execution of its target code when the crystal oscillator or small-signal input is powered down. In this case, the device switches to the slow ring oscillator clock first, by enabling the SLOWCKI field before writing a 1 to the XTLOFF field. Two operations to the powerc register. The target device will then continue execution of its code at slow speed, while the crystal oscillator or small-signal input clock is turned off. Switching from the slow clock back to the high-speed crystal oscillator clock is then accomplished in three user steps. First, XTLOFF is cleared. Then, a user-programmed routine sets the internal timer to a delay to wait for the crystal's oscillations to become stable. When the timer counts down to zero, the high-speed clock is selected by clearing the SLOWCKI field, either in the timer's interrupt service routine or following a timer polling loop. If PLL operation is desired, then an additional routine is necessary to enable the PLL and wait for it to lock.

nop

s are needed in between the two write

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4 Hardware Architecture

Power Management Examples Without the PLL

The following examples show the more significant options for reducing the power dissipation. These are valid only if the pllc register is set to disable and deselect the PLL (PLLEN = 0, PLLSEL = 0).

Standard Sleep Mode.

CKI, the alf register's AWAIT bit is set. Peripheral units may be turned off to further reduce the sleep power.

powerc = 0X00F0 /* Turn off peripherals, core running with CKI */

sleep:a0 = 0x8000 /* Set alf register in cache loop if running from */

do 1 { /* external memory with >1 wait state */ alf = a0 /* Stop internal processor clock, interrupt circuits */ nop /* active */ } nop /* Needed for bedtime execution. Only sleep power */

nop /* consumed here until.... interrupt wakes up the device */

cont: . . . /* User code executes here */

powerc = 0x0 /* Turn peripheral units back on */

Sleep with Slow Internal Clock.

is put to sleep. This will reduce the power dissipation while waiting for an interrupt to continue program execution.

powerc = 0x40F0 /* Turn off peripherals and select slow clock */ 2*nop /* Wait for it to take effect */

sleep:a0 = 0x8000 /* Set alf register in cache loop if running from */

do 1 { /* external memory with >1 wait state */ alf = a0 /* Stop internal processor clock, interrupt circuits */ nop /* active */ } nop /* Needed for bedtime execution. Reduced sleep power */

nop /* consumed here.... Interrupt wakes up the device */

cont: . . . /* User code executes here */

powerc = 0x00F0 /* Select high-speed clock */ 2*nop /* Wait for it to take effect */ powerc = 0x0000 /* Turn peripheral units back on */

This is the standard sleep mode. While the processor is clocked with a high-speed clock,

(continued)

In this case, the ring oscillator is selected to clock the processor before the device

Note that, in this case, the wake-up latency is determined by the period of the ring oscillator clock.

Sleep with Slow Internal Clock and Crystal Oscillator/Small-Signal Disabled.

crystal oscillator or the small-signal clock option, the clock input circuitry can be powered down to further reduce power. In this case, the slow clock must be selected first.

powerc = 0x40F0 /* Turn off peripherals and select slow clock */ 2*nop /* Wait for it to take effect */ powerc = 0xC0F0 /* Turn off the crystal oscillator */

sleep:a0 = 0x8000 /* Set alf register in cache loop if running from */

do 1 { /* external memory with >1 wait state */ alf = a0 /* Stop internal processor clock, interrupt circuits */ nop /* active */ } nop /* Needed for bedtime execution. Reduced sleep power */

nop /* consumed here.... Interrupt wakes up the device */

powerc = 0x40F0 /* Clear XTLOFF, reenable oscillator/small-signal */ call xtlwait /* Wait until oscillator/small-signal is stable */

cont: powerc = 0x00F0 /* Select high-speed clock */

2*nop /* Wait for it to take effect */ powerc = 0x0000 /* Turn peripheral units back on */

Note that, in this case, the wake-up latency is dominated by the crystal oscillator or small-signal start-up period. 32 Lucent Technologies Inc.

If the target device contains the

Page 33

Data Sheet March 2000 DSP1627 Digital Signal Processor

4 Hardware Architecture

Software Stop.

In this case, all internal clocking is disabled. INT0, INT1, or RSTB may be used to reenable the

(continued)

clocks. If the device uses the crystal oscillator or small-signal clock option, the power management must be done in correct sequence.

powerc = 0x4000 /* SLOWCKI asserted */ 2*nop /* Wait for it to take effect */ powerc = 0xD000 /* XTLOFF asserted if applicable and INT0EN asserted */ inc = NOINT0 /* Disable the INT0 interrupt */

sopor:powerc = 0xF000 /* NOCK asserted, all clocks stop */

/* Minimum switching power consumed here */

3*nop /* Some nops will be needed */

/* INT0 pin clears the NOCK field, clocking resumes */

cont: powerc = 0x4000 /* INT0EN cleared and XTLOFF cleared, if applicable*/

call waitxtl /* Wait for the crystal oscillator/small-signal to */

/* stabilize, if applicable*/ powerc = 0x0 /* Clear SLOWCKI field, back to high speed */ 2*nop /* Wait for it to take effect */ ins = 0x0010 /* Clear the INT0 status bit */

In this case also, the wake-up latency is dominated by the crystal oscillator or small-signal start-up period. The previous examples do not provide an exhaustive list of options available to the user. Many different clocking

possibilities exist for which the target device may be programmed, depending on:

■

The clock source to the processor.

■

Whether the user chooses to power down the peripheral units.

■

The operational state of the crystal oscillator/small-signal clock input, powered or unpowered.

■

Whether the internal processor clock is disabled through hardware or software.

■

The combination of power management modes the user chooses.

■

Whether or not the PLL is enabled.

An example subroutine for xtlwait follows:

xtlwait: timer0 = 0x2710 /* Load a count of 10,000 into the timer */

timerc = 0x0010 /* Start the timer with a PRESCALE of two */ inc = 0x0000 /* Disable the interrupts */

loop1: a0 = ins /* Poll the ins register */

a0 = a0 & 0x0100 /* Check bit 8 (TIME) of the ins register */ if eq goto loop1 /* Loop if the bit is not set */ ins = 0x0100 /* Clear the TIME interrupt bit */ return /* Return to the main program */

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4 Hardware Architecture

Power Management Examples with the PLL

The following examples show the more significant options for reducing power dissipation if operation with the PLL clock synthesizer is desired.

Standard Sleep Mode, PLL Running.

the input to the clock synthesizer, CKI, remains running, the alf register's AWAIT bit is set. The PLL will continue to run and dissipate power. Peripheral units may be turned off to further reduce the sleep power.

powerc = 0x00F0 /* Turn off peripherals, core running with PLL */

sleep:a0 = 0x8000 /* Set alf register in cache loop if running from */

do 1 { /* external memory with >1 wait state */ alf = a0 /* Stop internal processor clock, interrupt circuits */ nop /* active */ } nop /* Needed for bedtime execution. Only sleep power plus PLL */

nop /* power consumed here.... Interrupt wakes up the device */

cont: . . . /* User code executes here */

powerc = 0x0 /* Turn peripheral units back on */

Sleep with Slow Internal Clock, PLL Running

before the device is put to sleep. This will reduce power dissipation while waiting for an interrupt to continue program execution.

powerc = 0x40F0 /* Turn off peripherals and select slow clock */ 2*nop /* Wait for slow clock to take effect */

sleep:a0 = 0x8000 /* Set alf register in cache loop if running from */

do 1 { /* external memory with >1 wait state */ alf = a0 /* Stop internal processor clock, interrupt circuits */ nop /* active */ } nop /* Needed for bedtime execution. Reduced sleep power, PLL */ nop /* power, and ring oscillator power consumed here... */

cont: . . . /* User code executes here */

powerc = 0x00F0 /* Select high-speed PLL based clock */ 2*nop /* Wait for it to take effect */ powerc = 0x0000 /* Turn peripheral units back on */

(continued)

This mode would be entered in the same manner as without the PLL. While

. In this case, the ring oscillator is selected to clock the processor

/* Interrupt wakes up the device */

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Data Sheet March 2000 DSP1627 Digital Signal Processor

4 Hardware Architecture

Sleep with Slow Internal Clock and Crystal Oscillator/Small-Signal Disabled, PLL Disabled

vice contains the crystal oscillator or the small-signal clock option, the clock input circuitry can be powered down to further reduce power. In this case, the slow clock must be selected first, and then the PLL must be disabled, since the PLL cannot run without the clock input circuitry being active.

powerc = 0x40F0 /* Turn off peripherals and select slow clock */ 2*nop /* Wait for slow clock to take effect */ pllc = 0x29F2 /* Disable PLL (assume N = 1,M = 20, LF = 1001) */ powerc = 0xC0F0 /* Disable crystal oscillator */

sleep:a0 = 0x8000 /* Set alf register in cache loop if running from */

do 1 { /* external memory with >1 wait state */ alf = a0 /* Stop internal processor clock, interrupt circuits */ nop /* active */ } nop /* Needed for bedtime execution. Reduced sleep power

nop /* consumed here.... Interrupt wakes up device */

powerc = 0x40F0 /* Clear XTLOFF, leave PLL disabled */ call xtlwait /* Wait until crystal oscillator/small-signal is stable */ pllc = 0xE9F2 /* Enable PLL, continue to run off slow clock */ call pllwait /* Loop to check for LOCK flag assertion */

cont: powerc = 0x00F0 /* Select high-speed PLL based clock */

2*nop /* Wait for it to take effect */ powerc = 0x0000 /* Turn peripherals back on */

(continued)

. If the target de-

Software Stop, PLL Disabled

reenable the clocks. If the device uses the crystal oscillator or small-signal clock option, the power management must be done in the correct sequence, with the PLL being disabled before shutting down the clock input buffer.

powerc = 0x4000 /* SLOWCKI asserted */ 2*nop /* Wait for slow clock to take effect */ pllc = 0x29F2 /* Disable PLL (assume N = 1, M = 20, LF = 1001) */ powerc = 0xD000 /* XTLOFF asserted, if applicable and INT0EN

sopor:powerc = 0xF000 /* NOCK asserted, all clocks stop */

3*nop /* Some nops will be needed */

cont: powerc = 0x4000 /* INTOEN cleared and XTLOFF cleared, if applicable */

call xtlwait /* Wait until crystal oscillator/small-signal is stable */

pllc = 0xE9F2 /* Enable PLL, continue to run off slow clock */ call pllwait /* Loop to check for LOCK flag assertion */ powerc = 0x0 /* Select high-speed PLL based clock */ 2*nop /* Wait for it to take effect */ ins = 0x0010 /* Clear the INT0 status bit */

. In this case, all internal clocking is disabled. INT0, INT1, or RSTB may be used to

/* asserted */

/* Minimum switching power consumed here */

/* INT0 pin clears NOCK field, clocking resumes */

/* if applicable */

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Data Sheet

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5 Software Architecture

5.1 Instruction Set

The DSP1627 processor has seven types of instructions: multiply/ALU, special function, control, F3 ALU, BMU, cache, and data move. The multiply/ALU instructions are the primary instructions used to implement signal processing algorithms. Statements from this group can be combined to generate multiply/accumulate, logical, and other ALU functions and to transfer data between memory and registers in the data arithmetic unit. The special function instructions can be conditionally executed based on flags from the previous ALU or BMU operation, the condition of one of the counters, or the value of a pseudorandom bit in the DSP1627 device. Special function instructions perform shift, round, and complement functions. The F3 ALU instructions enrich the operations available on accumulators. The BMU instructions provide high-performance bit manipulation. The control instructions implement the goto and call commands. Control instructions can also be executed conditionally. Cache instructions are used to implement low-overhead loops, conserve program memory, and decrease the execution time of certain multiply/ALU instructions. Data move instructions are used to transfer data between memory and registers or between accumulators and registers. See the

Digital Signal Processor Information Manual

tailed description of the instruction set. The following operators are used in describing the in-

struction set:

■

* 16 x 16-bit –> 32-bit multiplication

direct addressing when used as a prefix to an address register

denotes direct addressing

when used as a prefix to an immediate

■

+ 36-bit addition

■

– 36-bit subtraction

■

>> Arithmetic right shift

■

>>> Logical right shift

■

<< Arithmetic left shift

■

<<< Logical left shift

■

| 36-bit bitwise OR

■

& 36-bit bitwise AND

■

^ 36-bit bitwise EXCLUSIVE OR

■

: Compound address swapping, accumulator

†

shuffling

■

~ One's complement

DSP1611/17/18/27

†

for a de-

Multiply/ALU Instructions

Note that the function statements and transfer statements in Table 13 are chosen independently. Any function statement (F1) can be combined with any transfer statement to form a valid multiply/ALU instruction. If either statement is not required, a single statement from either column also constitutes a valid instruction. The number of cycles to execute the instruction is a function of the transfer column. (An instruction with no transfer statement executes in one instruction cycle.) Whenever PC, pt, or rM is used in the instruction and points to external memory, the programmed number of wait-states must be added to the instruction cycle count. All multiply/ALU instructions require one word of program memory. The no-operation (

nop

) instruction is a specialcase encoding of a multiply/ALU instruction and executes in one cycle. The assembly-language representation of a

nop

is either

nop

or a single semicolon.

A single-cycle squaring function is provided in DSP1627. By setting the X = Y = bit in the auc register, any instruction that loads the high half of the y register also loads the x register with the same value. A subsequent instruction to multiply the x register and y register results in the square of the value being placed in the p register. The instruction a0 = p p = x*y y = *r0++ with the X = Y = bit set to one will read the value pointed to by r0, load it to both x and y, multiply the previously fetched value of x and y, and transfer the previous product to a0. A table of values pointed to by r0 can thus be squared in a pipeline with one instruction cycle per each value. Multiply/ALU instructions that use x = X transfer statements (s uch as a 0 = p p = x*y y = *r0 ++ x = *pt ++) are not recommended for squaring because pt will be incremented even though x is not loaded from the value pointed to by pt. Also, the same conflict wait occurrences from reading the same bank of internal memory or reading from external memory apply, since the X space fetch occurs (even though its value is not used).

† These are 36-bit operations. One operand is 36-bit data in an ac-

cumulator; the other operand may be 16, 32, or 36 bits.

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Data Sheet March 2000 DSP1627 Digital Signal Processor

5 Software Architecture

(continued)

Table 13. Multiply/ALU Instructions

Function Statement

Transfer Statement

†

Cycles (Out/In Cache)

p = x * y y = Y x = X 2/1

aD = p p = x * y y = aT x = X 2/1 aD = aS + p p = x * y y[l] = Y 1/1 aD = aS – p p = x * y aT[l] = Y 1/1

aD = p x = Y 1/1 aD = aS + p Y 1/1 aD = aS – p Y = y[ l] 2/2

aD = y Y = aT[l] 2/2 aD = aS + y Z:y x = X 2/2 aD = aS – y Z:y[l] 2/2 aD = aS & y Z:aT[l] 2/2

aD = aS | y

aD = aS ^ y

aS – y

aS & y

† The l in [ ] is an optional argument that specifies the low 16 bits of aT or y. ‡ Add cycles for:

1. When an external memory access is made in X or Y space and wait-states are programmed, add the number of wait-states.

2. If an X space access and a Y space access are made to the same bank of DPRAM in one instruction, add one cycle.

‡

Note:

For transfer statements when loading the upper half of an accumulator, the lower half is cleared if the corresponding CLR bit in the auc register is zero. auc is cleared by reset.

Table 14. Replacement Table for Multiply/ALU Instructions

Replace Value Meaning

aD, aS, aT a0, a1 One of two DAU accumulators.

X *pt++, *pt++i X memory space location pointed to by pt. pt is postmodified by +1 and

i, respectively.

Y *rM, *rM++, *rM--, rM++j RAM location pointed to by rM (M = 0, 1, 2, 3). rM is postmodified by

0, +1, –1, or j, respectively.

Z *rMzp, *rMpz, *rMm2, *rMjk Read/Write compound addressing. rM (M = 0, 1, 2, 3) is used twice.

First, postmodified by 0, +1, –1, or j, respectively; and, second, postmodified by +1, 0, +2, or k, respectively.

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Data Sheet

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5 Software Architecture

Special Function Instructions

All forms of the special function require one word of program memory and execute in one instruction cycle. (If PC points to external memory, add programmed wait-states.)

aD = aS >> 1 aD = aS >> 4 aD = aS >> 8 aD = aS >> 16

aD = aS — Load destination accumulator from source accumulator aD = –aS — 2's complement

aD = ~aS aD = rnd(aS) — Round upper 20 bits of accumulator aDh = aSh + 1 — Increment upper half of accumulator (lower half cleared) aD = aS + 1 — Increment accumulator aD = y — Load accumulator with 32-bit y register value with sign extend aD = p — Load accumulator with 32-bit p register value with sign extend

aD = aS << 1 aD = aS << 4 aD = aS << 8 aD = aS << 16

}

Arithmetic right shift (sign preserved) of 36-bit accumulators

— 1's complement

}

Arithmetic left shift (sign not preserved) of the lower 32 bits of accumulators (upper 4 bits are sign-bit-extended from bit 31 at the completion of the shift)

(continued)

The above special functions can be conditionally executed, as in:

if CON instruction

and with an event counter

ifc CON instruction

which means:

if CON is true then

c1 = c1 + 1 instruction c2 = c1

else

c1 = c1 + 1

The above special function statements can be executed unconditionally by writing them directly, e.g., a0 = a1.

Table 15. Replacement Table for Special Function Instructions

Replace Value Meaning

aD aS

CON mi, pl, eq, ne, gt, le, lvs, lvc, mvs, mvc, c0ge,

c0lt, c1ge, c1lt, heads, tails, true, false, allt, allf,

somet, somef, oddp, evenp , mns1, nmns1, npint,

a0, a1 One of two DAU accumulators.

See Table 17 for definitions of mnemonics.

njint, lock

* This function is not available for the DSP16A.

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5 Software Architecture

(continued)

Control Instructions

All control instructions executed unconditionally execute in two cycles, except

icall

which takes three cycles. Control instructions executed conditionally execute in three instruction cycles. (If PC, pt, or pr point to external memory, add programmed wait-states.) Control instructions executed unconditionally require one word of program memory, while control instructions executed conditionally require two words. Control instructions cannot be executed from the cache.

goto JA

†

goto pt call JA

†

call pt icall

‡

return (goto pr) ireturn (goto pi)

goto JA

†The

goto

the to the desired current page.

‡The

icall

instruction is reserved for development system use.

The above control instructions, with the exception of

call JA

and

call

is placed there, the program counter will have incremented to the next page and the jump will be to the next page, rather than

instructions should not be placed in the last or next-to-last instruction before the boundary of a 4 Kwords page. If

ireturn

and

icall

, can be conditionally executed. For example:

if le goto 0x0345

Table 16. Replacement Table for Control Instructions

Replace Value Meaning

CON mi, pl, eq, ne, gt, le, nlvs, lvc, mvs, mvc, c0ge, c0lt,

See Table 17 for definitions of mnemonics.

c1ge, c1lt, heads, tails, true, false, allt, allf, somet,

somef, oddp, evenp, mns1, nmns1, npint, njint, lock

JA 12-bit value Least significant 12 bits of absolute address

within the same 4 Kwords memory section.

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Conditional Mnemonics (Flags)

Table 17 lists mnemonics used in conditional execution of special function and control instructions.

Table 17. DSP1627 Conditional Mnemonics

Test Meaning Test Meaning

pl Result is nonnegative (sign bit is bit 35). ≥ 0 mi Result is negative. < 0

eq Result is equal to 0. = 0 ne Result is not equal to 0. ≠ 0

gt Result is greater than 0. > 0 le Result is less than or equal to 0. ≤ 0

lvs Logical overflow set.

mvs Mathematical overflow set.

†

lvc Logical overflow clear.

mvc Mathematical overflow clear. c0ge Counter 0 greater than or equal to 0. c0lt Counter 0 less than 0. c1ge Counter 1 greater than or equal to 0. c1lt Counter 1 less than 0.

heads Pseudorandom sequence bit set. tails Pseudorandom sequence bit clear.

true The condition is always satisfied in an if in-

struction.

allt All True, all BIO input bits tested compared

successfully.

somet Some True, some BIO input bits tested com-

pared successfully.

false The condition is never satisfied in an if instruc-

tion.

allf All False, no BIO input bits tes ted com par ed

successfully.

somef Some False, some BIO input bits tested did

not compare successfully.

oddp Odd Parity, from BMU operation. evenp Even Parity, from BMU operation.

mns1 Minus 1, result of BMU operation. nmns1 Not Minus 1, result of BMU operation.

npint Not PINT, used by hardware development

system.

njint Not JINT, used by hardware development

system.

lock The PLL has achieved lock and is stable.

* Result is not representable in the 36-bit accumulators (36-bit overflow). † Bits 35—31 are not the same (32-bit overflow).

Notes: Testing the state of the counters (c0 or c1) automatically increments the counter by one.

The heads or tails condition is determined by a randomly set or cleared bit, respectively. The bit is randomly set with a probability of 0.5. A random rounding function can be implemented with either heads or tails. The random bit is generated by a ten-stage pseudorandom sequence generator (PSG) that is updated after either a heads or tails test. The pseudorandom sequence may be reset by writing any value to the pi register, except during an interrupt service routine (ISR). While in an ISR, writing to the pi register updates the register and does not reset the PSG. If not in an ISR, writing to the pi register resets the PSG. (The pi register is updated, but will be written with the contents of the PC on the next instruction.)

Interrupts must be disabled when writing to the pi register.

value, the resets the PSG.

ireturn

instruction will not return to the correct location. If the RAND bit in the auc register is set, however, writing the pi regist er never

If an interrupt is taken after the pi write, but before pi is updated with the PC

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F3 ALU Instructions

These instructions are implemented in the DSP1600 core. They allow accumulator two-operand operations with either another accumulator, the p register, or a 16-bit immediate operand (IM16). The result is placed in a destination accumulator that can be independently specified. All operations are done with the full 36 bits. For the accumulator with accumulator operations, both inputs are 36 bits. For the accumulator with p register operations, the p register is sign-extended into bits 35—32 before the operation. For the accumulator high with immediate operations, the immediate is sign-extended into bits 35—32 and the lower bits 15—0 are filled with zeros, except for the AND operation, for which they are filled with ones. These conventions allow the user to do operations with 32-bit immediates by programming two consecutive 16-bit immediate operations. The F3 ALU instructions are shown in Table 18.

Table 18. F3 ALU Instructions

F3 ALU Instructions

Cachable (One-Cycle)

aD = aS + aT aD = aS – aT aD = aS & aT

aD = aS | aT aD =aS ^ aT

aS – aT

aS & aT aD = aS + p aD = aS – p aD = aS & p

aD = aS | p

aD = aS ^ p

aS – p aS & p

†

Not Cachable (Two-Cycle)

aD = aSh + IM16 aD = aSh – IM16 aD = aSh & IM16

aD = aSh | IM16

aD = aSh ^ IM16

aSh – IM16

aSh & IM16 aD = aSl + IM16 aD = aSl – IM16

aD = aSl & IM16

aD = aSl | IM16

aD = aSl ^ IM16

aSl – IM16

aSl & IM16

‡

Note: The F3 ALU instructions that do not have a destination accumulator are used to set flags for conditional

operations, i.e., bit test operations.

† If PC points to external memory, add programmed wait-states. ‡ The h and l are required notation in these instructions.

F4 BMU Instructions

The bit manipulation unit in the DSP1627 provides a set of efficient bit manipulation operations on accumulators. It contains four auxiliary registers, ar<0—3> (arM, M = 0, 1, 2, 3), two alternate accumulators (aa0—aa1), which can be shuffled with the working set, and four flags (oddp, evenp, mns1, and nmns1). The flags are testable by conditional instructions and can be read and written via bits 4—7 of the alf register. The BMU also sets the LMI, LEQ, LLV, and LMV flags in the psw register.

■

LMI = 1 if negative (i.e., bit 35 = 1)

■

LEQ = 1 if zero (i.e., bits 35—0 are 0)

■

LLV = 1 if (a) 36-bit overflow, or if (b) illegal shift on field width/offset condition

■

LMV = 1 if bits 31—35 are not the same (32-bit overflow)

The BMU instructions and cycle times follow. (If PC points to external memory, add programmed wait-states.) All BMU instructions require 1 word of program memory unless otherwise noted. Please refer to the

27 Digital Signal Processor Information Manual

for further discussion of the BMU instructions.

DSP1611/17/18/

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■

Barrel Shifter:

(continued)

aD = aS >> IM16 Arithmetic right shift by immediate (36-bit, sign filled in); 2-cycle, 2-word. aD = aS >> arM Arithmetic right shift by arM (36-bit, sign filled in); 1-cycle. aD = aS

>> aS Arithmetic right shift by aS (36-bit, sign filled in); 2-cycle.

aD = aS >>> IM16 Logical right shift by immediate (32-bit shift, 0s filled in); 2-cycle, 2-word. aD = aS >>> arM Logical right shift by arM (32-bit shift, 0s filled in); 1-cycle. aD = aS

aD = aS << IM16 Arithmetic left shift aD = aS << arM Arithmetic left shift aD = aS << aS Arithmetic left shift

>>> aS Logical right shift by aS (32-bit shift, 0s filled in); 2-cycle.

†

by immediate (36-bit shift, 0s filled in); 2-cycle, 2-word.

†

by arM (36-bit shift, 0s filled in); 1-cycle.

†

by aS (36-bit shift, 0s filled in); 2-cycle.

aD = aS <<< IM16 Logical left shift by immediate (36-bit shift, 0s filled in); 2-cycle, 2-word. aD = aS <<< arM Logical left shift by arM (36-bit shift, 0s filled in); 1-cycle. aD = aS

† Not the same as the special function arithmetic left shift. Here, the guard bit s in the destination accumulator are shifted in to, not sign-extended.

■

Normalization and Exponent Computation:

<<< aS Logical left shift by aS (36-bit shift, 0s filled in); 2-cycle.

aD = exp(aS) Detect the number of redundant sign bits in accumulator; 1-cycle. aD = norm(aS, arM) Normalize aS with respect to bit 31, with exponent in arM; 1-cycle.

■

Bit Field Extraction and Insertion:

aD = extracts(aS, IM16) Extraction with sign extension, field specified as immediate; 2-cycle, 2-word. aD = extracts(aS, arM) Extraction with sign extension, field specified in arM; 1-cycle.

aD = extractz(aS, IM16) Extraction with zero extension, field specified as immediate; 2-cycle, 2-word. aD = extractz(aS, arM) Extraction with zero extension, field specified in arM; 1-cycle.

aD = insert(aS, IM16) Bit field insertion, field specified as immediate; 2-cycle, 2-word. aD = insert(aS, arM) Bit field insertion, field specified in arM; 2-cycle.

Note:

The bit field to be inserted or extracted is specified as follows. The width (in bits) of the field is the upper byte of the operand (immediate or arM), and the offset from the LSB is in the lower byte.

■

Alternate Accumulator Set:

aD = aS:aa0 Shuffle accumulators with alternate accumulator 0 (aa0); 1-cycle. aD = aS:aa1 Shuffle accumulators with alternate accumulator 1 (aa1); 1-cycle.

Note:

The alternate accumulator gets what was in aS. aD gets what was in the alternate accumulator.

Table 19. Replacement Table for F3 ALU Instructions and F4 BMU Instructions

Replace Value Meaning

aD, aT, aS a0 or a1 One of the two accumulators.

IM16 immediate 16-bit data, sign-, zero-, or one-extended as appropriate.

arM ar<0—3> One of the auxiliary BMU registers.

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Cache Instruction s

Cache instructions require one word of program memory. The do instruction executes in one instruction cycle, and

redo

the

instruction executes in two instruction cycles. (If PC points to external memory, add programmed waitstates.) Control instructions and long immediate values cannot be stored inside the cache. The instruction formats are as follows:

■

do K {

■

instr1

■

instr2

■

instrN

■

}

■

redo K

Table 20. Replacement Table for Cache Instructions

Replace Instruction

Meaning

Encoding

cloop

†

Number of times the instructions are to be executed taken from bits 0—6 of the

cloop

1 to 127 Number of times the instructions to be executed is encoded in the instruction.

N 1 to 15 1 to 15 instructions can be included.

† The assembly-language statement, do

cloop

(or redo

cloop

), is used to specify that the number of iterations is to be taken from the

cloop

When the cache is used to execute a block of instructions, the cycle timings of the instructions are as follows:

1. In the first pass, the instructions are fetched from program memory and the cycle times are the normal out-of-

cache values, except for the last instruction in the block of NI instructions. This instruction executes in two cycles.

2. During pass two through pass K – 1, each instruction is fetched from cache and the in-cache timings apply.

3. During the last (Kth) pass, the block of instructions is fetched from cache and the in-cache timings apply, except

that the timing of the last instruction is the same as if it were out-of-cache.

4. If any of the instructions access external memory, programmed wait-states must be added to the cycle counts.

redo

The Using the

The number of iterations, K, for a do or

cloop

value of

instruction treats the instructions currently in the cache memory as another loop to be executed K times.

redo

instruction, instructions are reexecuted from the cache without reloading the cache.

redo

can be set at run time by first moving the number of iterations into the

cloop

is decremented to 0; hence,

cloop

needs to be written before each

cloop

or redo

cloop

. At the completion of the loop, the

do cloop or redo cloop

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Data Move Instructions

Data move instructions normally execute in two instruction cycles. (If PC or rM point to external memory, any programmed wait-states must be added. In addition, if PC and rM point to the same bank of DPRAM, then one cycle must be added.) Immediate data move instructions require two words of program memory; all other data move instructions require only one word. The only exception to these statements is a special case immediate load (short immediate) instruction. If a YAAU register is loaded with a 9-bit short immediate value, the instruction requires only one word of memory and executes in one instruction cycle. All data move instructions, except those doing long immediate loads, can be executed from within the cache. The data move instructions are as follows:

■

R = IM16

■

aT[l] = R

■

SR = IM9

■

Y = R

■

R = Y

■

Z : R

■

R = aS[l]

■

DR = *(OFFSET)

■

(OFFSET) = DR

Table 21. Replacement Table for Data Move Instructions

Replace Value Meaning

R Any of the registers in Table 51 —

DR r<0—3>, a0[l], a1[l], y[l], p, pl, x,

Subset of registers accessible with direct addressing.

pt, pr, psw

aS, aT a0, a1 High half of accumulator.

Y Z

rM, *rM++, *rM--, *rM++j Same as in multiply/ALU instructions.

rMzp, *rMpz, *rMm2, *rMjk Same as in multiply/ALU instructions.

IM16 16-bit value Long immediate data.

IM9 9-bit value Short immediate data for YAAU registers.

OFFSET 5-bit value from instruction

11-bit value in base register

Value in bits [15:5] of ybase register form the 11 most significant bits of the base address. The 5-bit offset is concatenated to this to form a 16-bit address.

SR r<0—3>, rb, re, j, k Subset of registers for short immediate.

Notes: sioc, sioc2, tdms, tdms2, srta, and srta2 registers are not readable.

When signed registers less than 16 bits wide (c0, c1, c2) are read, their contents are sign-extended to 16 bits. When unsigned registers less than 16 bits wide are read, their contents are zero-extended to 16 bits.

Loading an accumulator with a data move instruction does not affect the flags.

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5.2 Register Settings

Tables 22 through 38 describe the programmable registers of the DSP1627 device. Table 40 describes the register settings after reset.

Note that the following abbreviations are used in the tables:

■

x = don't care

■

R = read only

■

W = read/write

The reserved (RSVD) bits in the tables should always be written with zeros to make the program compatible with future chip versions.

Table 22. Serial I/O Control Registers sioc

Bit

Field

* See tdms register, SYNC field.

10987654321 0

DODLY LD CLK MSB OLD ILD OCK ICK OLEN ILEN

Field Value Description

DODLY 0

DO changes on the rising edge of OCK.

DO changes on the falling edge of OCK. This delay in driving DO increases the hold time on DO by half a cycle of OCK.

LD 0

CLK 00

MSB 0

OLD 0

ILD 0

OCK 0

ICK 0

OLEN 0

ILEN 0

In active mode, ILD1 and/or OLD1 = ICK1/16, active SYNC1 = ICK1/[128/256*].

In active mode, ILD1 and/or OLD1 = OCK1/16, active SYNC1 = OCK1/[128/256*]. Active clock = CKI/2 (1X).

Active clock = CKI/6 (1X).

Active clock = CKI/8 (1X).

Active clock = CKI/10 (1X).

LSB first.

MSB first. OLD1 is an input (passive mode).

OLD1 is an output (active mode). ILD1 is an input (passive mode).

ILD1 is an output (active mode). OCK1 is an input (passive mode).

OCK1 is an output (active mode). ICK1 is an input (passive mode).

ICK1 is an output (active mode). 16-bit output.

8-bit output. 16-bit input.

8-bit input.

‡

sioc2

Bit

Field

† See tdms register, SYNC field. ‡ The bit definitions of the sioc2 register are identical to the sioc register bit definitions.

109876543210

DODLY2 LD2 CLK2 MSB2 OLD2 ILD2 OCK2 ICK2 OLEN2 ILEN2

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Table 23. Time-Division Multiplex Slot Registers tdms

Bit

Field

9 8 7654321 0

SYNCSP MODE TRANSMIT SLOT SYNC

Field Value Description

SYNCSP

†

0‡

SYNC1 = ICK1/128 if LD = 0 SYNC1 = OCK1/128 if LD = 1*.

SYNC1 = ICK1/256 if LD = 0*. SYNC1 = OCK1/256 if LD = 1*.

MODE 0 Multiprocessor mode off; DOEN1 is an input (passive mode).

1 Multiprocessor mode on; DOEN1 is an output (active mode).

TRANSMIT SLOT 1xxxxxx Transmit slot 7.

x1xxxxx Transmit slot 6. xx1xxxx Transmit slot 5. xxx1xxx Transmit slot 4. xxxx1xx Transmit slot 3. xxxxx1x Transmit slot 2. xxxxxx1 Transmit slot 1.

SYNC 1 Transmit slot 0, SYNC1 is an output (active mode).

0 SYNC1 is an input (passive mode).

* See sioc register, LD field. ‡ Select this mode when in multiprocessor mode.

tdms2

Bit

Field

† See sioc register, LD field. ‡ Select this mode when in multiprocessor mode.

§ The tdms2 register bit definitions are identical to the tdms register bit definitions.

9 8 7654321 0

SYNCSP2

†

MODE2 TRANSMIT SLOT2 SYNC2

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Table 24. Serial Receive/Transmit Address Registers srta

Bit

Field

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

RECEIVE ADDRESS TRANSMIT ADDRESS

Field Value Description

RECEIVE ADDRESS 1xxxxxxx Receive address 7.

x1xxxxxx Receive address 6. xx1xxxxx Receive address 5. xxx1xxxx Receive address 4. xxxx1xxx Receive address 3. xxxxx1xx Receive address 2. xxxxxx1x Receive address 1. xxxxxxx1 Receive address 0.

TRANSMIT ADDRESS 1xxxxxxx Transmit address 7.

x1xxxxxx Transmit addre ss 6. xx1xxxxx Transmit address 5. xxx1xxxx Transmit address 4. xxxx1xxx Transmit address 3. xxxxx1xx Transmit address 2. xxxxxx1x Transmit address 1. xxxxxxx1 Transmit address 0.

†

srta2

Bit

Field

† The srta2 field definitions are identical to the srta register field definitions.

1514131211109876543210

RECEIVE ADDRESS2 TRANSMIT ADDRESS2

Table 25. Multiprocessor Protocol Registers saddx

Bit Field

Write Read

saddx2

‡

Read Protocol Field [7:0] 0

Bit Field

Write Read

‡ The saddx2 field definitions are identical to the saddx register field definitions.

Read Protocol2 Field [7:0] 0

15—8 7—0

X Write Protocol Field [7:0]

15—8 7—0

X Write Protocol2 Field [7:0]

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Table 26. Processor Status Word (psw) Register

Bit

Field

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

DAU FLAGS X X a1[V] a1[35:32] a0[V] a0 [35 :32]

Field V alue Description

DAU FLAGS

Wxxx LMI — logical minus when set (bit 35 = 1). xWxx LEQ — logical equal when set (bit [35:0] = 0). xxWx LLV — logical overflow when set. xxxW LMV — mathematical overflow when set.

a1[V] W Accumulator 1 (a1) overflow when set.

a1[35:32] Wxxx Accumulator 1 (a1) bit 35.

xWxx Accumulator 1 (a1) bit 34. xxWx Accumulator 1 (a1) bit 33. xxxW Accumulator 1 (a1) bit 32.

a0[V] W Accumulator 0 (a0) overflow when set.

a0[35:32] Wxxx Accumulator 0 (a0) bit 35.

xWxx Accumulator 0 (a0) bit 34. xxWx Accumulator 0 (a0) bit 33. xxxW Accumulator 0 (a0) bit 32.

* The DAU flags can be set by either BMU or DAU operations.

Table 27. Arithmetic Unit Control (auc) Register

Bit

Field

8 7654321 0

RAND X=Y= CLR SAT ALIGN

†

Field Value Description

RAND 0

Pseudorandom sequence generator (PSG) reset by writing the pi register only outside an interrupt service routine.

X=Y= 0

PSG never reset by writing the pi register. Normal operation.

All instructions which load the high half of the y register also load the x register, allowing single-cycle squaring with p = x * y.

CLR 1xx Clearing yl is disabled (enabled when 0).

x1x Clearing a1l is disabled (enabled when 0). xx1 Clearing a0l is disabled (enabled when 0).

SAT 1x a1 saturation on overflow is disabled (enabled when 0).

x1 a0 saturation on overflow is disabled (enabled when 0).

ALIGN 00 a0, a1

←

p. 01 a0, a1 ← p/4. 10 a0, a1 ← p x 4 (and zeros written to the two LSBs). 11 a0, a1 ← p x 2 (and zero written to the LSB).

† The auc is 9 bits [8:0]. The upper 7 bits [15:9] are always zero when read and should always be written with zeros to make the program

compatible with future chip versions. The auc register is cleared at reset.

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Table 28. Parallel Host Interface Control (phifc) Register

Bit

Field

PMODE 0

PSTROBE 0

PSTRB 0

PBSELF 0

PFLAG 0

PFLAGSEL 0

PSOBEF 0

15—7 6 5 4 3 2 1 0 RSVD PSOBEF PFLAGSEL PFLAG PBSELF PSTRB PSTROBE PMODE

Field Value Description

(continued)

8-bit data transfers. 16-bit data transfers.

Intel

protocol: PIDS and PODS data strobes.

Motorola

When PSTROBE = 1, PODS pin (PDS) active-low. When PSTROBE = 1, PODS pin (PDS) active-high.

In either mode, PBSEL pin = 0 → pdx0 low byte. See Table 7. If PMODE = 0, PBSEL pin = 1 → pdx0 low byte. If PMODE = 1, PBSEL pin = 0 → pdx0 high byte.

PIBF and POBE pins active-high. PIBF and POBE pins active-low.

Normal. PIBF flag ORed with POBE flag and output on PIBF pin; POBE pin unchanged (output buffer empty).

Normal. POBE flag as read through PSTAT register is active-low.

protocol: PRWN and PDS data strobes.

Table 29. Interrupt Control (inc) Register

Bit

Field

* JINT is a JTAG interrupt and is controlled by the HDS. It may be made unmaskable by the Lucent Technologies development system tools.

Encoding: A 0 disables an interrupt; a 1 enables an interrupt.

Table 30. Interrupt Status (ins) Register

Bit

Field

Encoding: A 0 indicates no interrupt. A 1 indicates an interrupt has been recognized and is pending or being serviced. If a 1 is written to bits 4, 5, or 8 of ins, the corresponding interrupt is cleared.

15 14—11 10 9 8 7—6 5—4 3 2 1 0

JINT

15 14—11 10 9 8 7—6 5—4 3 2 1 0

JINT RSVD OBE2 IBF2 TIME RSVD INT[1:0] PIBF POBE OBE IBF

RSVD OBE2 IBF2 T IME RSVD INT[1:0] PIBF POBE OBE IBF

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Table 31. timerc Register

Bit

Field

15—7 6 5 4 3—0 RSVD DISABLE RELOAD T0EN PRESCALE

Field Value Description

DISABLE 0

RELOAD 0

T0EN 0

Timer enabled. Timer and prescaler disabled. The period register and timer0 are not reset.

Timer stops after counting down to 0. Timer automatically reloads and repeats indefinitely.

Timer holds current count. Timer counts down to 0.

PRESCALE — See table below.

PRESCALE Field

PRESCALE Frequency of

Timer Interrupts

0000 CKO/2 1000 CKO/512 0001 CKO/4 1001 CKO/1024 0010 CKO/8 1010 CKO/2048 0011 CKO/16 1011 CKO/4096 0100 CKO/32 1100 CKO/8192 0101 CKO/64 1101 CKO/16384 0110 CKO/128 1110 CKO/32768 0111 CKO/256 1111 CKO/65536

Timer Interrupts

Table 32. Phase-Locked Loop Control (pllc) Register

Bit

Field

15 14 13 12 11—8 7—5 4—0

PLLEN PLLSEL ICP SEL5V LF[3:0] Nbits[2:0] Mbits[4:0]

Field Value Description

PLLEN 0

PLLSEL 0

PLL powered down. PLL powered up.

DSP internal clock taken directly from CKI. DSP internal clock taken from PLL.

ICP — Charge pump current selection (see Table 64 for proper value).

SEL5V 0

3 V operation (see Table 64 for proper value). 5 V operation (see Table 64 for proper value).

LF[3:0] — Loop filter setting (see Table 64 for proper value). Nbits[2:0] — Encodes N, 1 ≤ N ≤ 8, where N = Nbits[2:0] + 2, unless Nbits[2:0] = 111, then N = 1. Mbits[4:0] — Encodes M, 2 ≤ M ≤ 20, where M = Mbits[4:0] + 2, f

INTERNAL CLOCK

= f

CKI

x (M/(2N)).

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Table 33. sbit Register

Bit

Field

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Field Value Description

DIREC 1xxxxxxx IOBIT7 is an output (input when 0).

x1xxxxxx IOBIT6 is an output (input when 0). xx1xxxxx IOBIT5 is an output (input when 0). xxx1xxxx IOBIT4 is an output (input when 0). xxxx1xxx IOBIT3 is an output (input when 0). xxxxx1xx IOBIT2 is an output (input when 0). xxxxxx1x IOBIT1 is an output (input when 0). xxxxxxx1 IOBIT0 is an output (input when 0).

VALUE Rxxxxxxx Reads the current value of IOBIT7.

xRxxxxxx Reads the current value of IOBIT6. xxRxxxxx Reads the current value of IOBIT5. xxxRxxxx Reads the current value of IOBIT4. xxxxRxxx Reads the current value of IOBIT3. xxxxxRxx Reads the current value of IOBIT2. xxxxxxRx Reads the current value of IOBIT1. xxxxxxxR Reads the current value of IOBIT0.

(continued)

DIREC[7:0] VALUE[7:0]

Table 34. cbit Register

Bit

Field

*0 ≤ n ≤ 7.

1514131211109876543210

MODE/MASK[7:4] MODE/MASK[3:0] DATA/PAT[7:4] DATA/PAT[3:0]

DIREC[n]

1 (Output) 0 0 Clear 1 (Output) 0 1 Set 1 (Output) 1 0 No Change 1 (Output) 1 1 Toggle

0 (Input) 0 0 No Test 0 (Input) 0 1 No Test 0 (Input) 1 0 Test for Zero 0 (Input) 1 1 Test for One

MODE/MASK[n] DATA/PAT[n] Action

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Table 35. alf Register

Bit

Field

Field Value Action

AWAIT 1

LOWPR 1

FLAGS — See table below.

Bit Flag Use

13—8 Reserved —

7 nmns1 NOT-MINUS-ONE from BMU 6 mns1 MINUS-ONE from BMU 5 evenp EVEN PA RITY fro m BMU 4 oddp ODD PARITY from BMU 3 somef SOME FALSE from BIO 2 somet SOME TRUE from BIO 1 allf ALL FALSE from BIO 0 allt ALL TRUE from BIO

15 14 13—0

A WAIT LOWPR FLAGS

(continued)

Power-saving standby mode or standard sleep enabled. Normal operation.

The internal DPRAM is addressed beginning at 0x0000 in X space. The internal DPRAM is addressed beginning at 0xc000 in X space.

Table 36. mwait Register

Bit

Field

If the EXM pin is high and the INT1 is low upon reset, the mwait register is initialized to all 1s (15 wait-states for all external memory). Otherwise, the mwait register is initialized to all 0s (0 wait-states) upon reset.

Table 37. DSP1627 32-Bit JTAG ID Register

Bit

Field

RESERVED 0 —

SECURE 0

CLOCK 01

ROMCODE — Users ROMCODE ID:

PART ID 0x1C DSP1627x36 with 36K IROM and no EROM in MAP1 or MAP3.

RESERVED SECURE CLOCK ROMCODE PART ID 0x03B

Field Value Mask-Programmable Features

15—12 11—8 7—4 3—0

EROM[3:0] ERAMHI[3:0] IO[3:0] ERAMLO[3:0]

31 30 29—28 27—19 18—12 11—0

Nonsecure ROM option.

10 11

0x2C DSP1627x32 with 32K IROM and 16K EROM in MAP1 and MAP3.

Secure ROM option. Small-signal input clock option.

Crystal oscill ator input clock o ption. CMOS level input clock option.

The ROMCODE ID is the 9-bit binary value of the following expression: (20 x value for first letter) + (value of second letter), where the values of the letters are in the following table. For example, ROMCODE GK is (20 x 6) + (9) = 129 or 0 1000 0001.

ROMCODE Letter

Value

52 Lucent Technologies Inc.

ABCDEFGHJKLMNPRSTUWY

012345678910111213141516171819

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Table 38. ioc Register

Bit

Field

* The field definitions for the ioc register are different from the DSP1610.

15 14 13 12 11 10 9 8—7 6—4 3—0

RSVD EXTROM CKO2 EBIOH WEROM ESIO2 SIOLBC CKO[1:0] RSVD DENB[3:0]

(continued)

ioc Fields

ioc Field Description

EXTROM If 1, sets AB15 low during external memory accesses when WEROM = 1.

CKO2 CKO configuration (see below).

EBIOH If 1, enables high half of BIO, IOBIT[4:7], and disables VEC[3:0] from pins.

WEROM If 1, allows writing into external program (X) memory.

ESIO2 If 1, enables SIO2 and low half of BIO, and disables PHIF from pins.

SIOLBC If 1, DO1 and DO2 looped back to DI1 and DI2.

CKO[1:0] CKO configuration (see below).

DENB3 If 1, delay EROM. DENB2 If 1, delay ERAMHI. DENB1 If 1, delay IO. DENB0 If 1, delay ERAMLO.

CKO2 CKO1 CKO0 CKO Output Description

1X PLL — 0 0 0 CKI CKI x M/(2N) Free-running clock. 0 0 1 CKI/(1 + W) CKI x (M/(2N)) / [1 + W]

010 1 1

Wait-state d clock. Held high.*,

*, †

‡

†

, 0 1 1 0 0 Held low. 1 0 0 CKI CKI Output of CKI buffer. 1 0 1 CKI/(1 + W) CKI x (M/(2N)) / [1 + W]

Sequenced, wait-stated clock.*,

†, ‡, §

1 1 0 Reserved 1 1 1 Reserved

* The phase of CKI is synchronized by the rising edge of RSTB. † When SLOWCKI is enabled in the powerc register, these options reflect the low-speed internal ring oscillator. ‡ The wait-stated clock reflects the internal instruction cycle and may be stretched based on the mwait register setting (see Table 36). During

sequenced external memory accesses, it completes one cycle.

§ The sequenced wait-stated clock completes two cycles during a sequenced external memory access and may be stretched based on the mwait register setting (see Table 36).

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Table 39. powerc Register

powerc

The

Bit

Field

Note: The reserved (RSVD) bits should always be written with zeros to make the program compatible with future chip versions.

15 14 13 12 11 10 9—8 7 6 5 4 3—0

XTLOFF SLOWCKI NOCK INT0EN RSVD INT1EN RSVD SIO1DIS SIO2DIS PHIFDIS TIMERDIS RSVD

powerc fields

Field Description

XTLOFF 1 = powerdown crystal oscillator or small-signal clock input.

SLOWCKI 1 = select ring oscillator clock (internal slow clock).

NOCK 1 = disable internal processor clock. INT0EN 1 = INT0 clears NOCK field. INT1EN 1 = INT1 clears NOCK field.

SIO1DIS 1 = disable SIO1. SIO2DIS 1 = disable SIO2. PHIFDIS 1 = disable PHIF.

TIMERDIS 1 = disable timer.

A • indicates that this bit is unknown on powerup reset and unaffected on subsequent reset. An S indicates that this bit shadows the PC. P indicates the value on an input pin, i.e., the bit in the register reflects the value on the corresponding input pin.

Table 40. Register Settings After Reset

r0 •••••••••••••••• inc 0000000000000000

r1 •••••••••••••••• ins 0000010000000110

r2 •••••••••••••••• sdx2 ••••••••••••••••

r3 •••••••••••••••• saddx ••••••••••••••••

j •••••••••••••••• cloop 000000000•••••••

k •••••••••••••••• mwait

rb 0000000000000000 saddx2 ••••••••••••••••

re 0000000000000000 sioc2 ••••••0000000000

pt •••••••••••••••• cbit ••••••••••••••••

pr •••••••••••••••• sbit 00000000PPPPPPPP

pi SSSSSSSSSSSSSSSS ioc 0000000000000000

i •••••••••••••••• jtag ••••••••••••••••

p ••••••••••••••••

pl •••••••••••••••• a0 ••••••••••••••••

x •••••••••••••••• a0l •••••••••••••••• y •••••••••••••••• a1 ••••••••••••••••

yl •••••••••••••••• a1l •••••••••••••••• auc 0000000000000000 timerc ••••••••00000000 psw ••••00•••••••••• timer0 0000000000000000

c0 •••••••••••••••• tdms2 ••••••0000000000 c1 ••••••••••••••• srta2 •••••••••••••••• c2 •••••••••••••••• powerc 0000000000000000

sioc ••••••0000000000 pllc 0000000000000000

srta •••••••••••••••• ar0 •••••••••••••••• sdx •••••••••••••••• ar1 ••••••••••••••••

tdms ••••••0000000000 ar2 •••••••••••••••• phifc 0000000000000000 ar3 •••••••••••••••• pdx0 0000000000000000

ybase •••••••••••••••• alf 00000000••••••••

0000000000000000

†

† If EXM is high and INT1 is low when RSTB goes high, mwait will contain all ones instead of all zeros.

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5.3 Instruction Set Formats

This section defines the hardware-level encoding of the DSP1627 device instructions.

Multiply/ALU Instructions

Format 1: Multiply/ALU Read/Write Group

Field

Bit

Format 1a: Multiply/ALU Read/Write Group

Field

Bit

Format 2: Multiply/ALU Read/Write Group

Field

Bit

Format 2a: Multiply/ALU Read/Write Group

Field

Bit

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

TDSF1XY

TaTSF1XY

TDSF1XY

TaTSF1XY

Special Function Instructions

Format 3: F2 ALU Special Functions

Field

Bit

Format 3a: F3 ALU Operations

Field

Bit

Format 3b: BMU Operations

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Field

Bit

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

TDSF2 CON

T D S F3 SRC2 aT 0 1

T D S F4[3—1] 0 F4[0] AR

Immediate Operand (IM16)

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Control Instructions

Format 4: Branch Direct Group

Field

Bit

Format 5: Branch Indirect Group

Field

Bit

Format 6: Conditional Branch Qualifier/Software Interrupt (icall)

Field

Bit

Note: A branch instruction immediately follows except for a software interrupt (icall).

Data Move Instructions

Format 7: Data Move Group

Field

Bit

1514131211109876543210

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

TJA

TB Reserved0

T SI Reserved CON

TaT R Y/Z

(continued)

Format 8: Data Move (immediate operand—2 words)

Field

Bit

Format 9: Short Immediate Group

Field

Bit

Format 9a: Direct Addressing

Field

Bit

Cache Instruction s

Format 10: Do/Redo

Field

Bit

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

1514131211109876543210

T D R Reserved

Immediate Operand (IM16)

T I Short Immediate Operand (IM9)

T R/W DR 1 OFFSET

TNI K

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Field Descriptions Table 41. T Field

Specifies the type of instruction.

T Operation Format

0000x goto JA 4 00010 Short imm j, k, rb, re 9 00011 Short imm r0, r1, r2, r3 9 00100 Y = a1[l] F1 1 00101 Z : aT[l] F1 2a 00110 Y F1 1 00111 aT[l] = Y F1 1a 01000 Bit 0 = 0, aT = R 7 01000 Bit 0 = 1, aTl = R 7 01001 Bit 10 = 0, R = a0 7 01001 Bit 10 = 1, R = a0l 7 01010 R = IM16 8 01011 Bit 10 = 0, R = a1 7 01011 Bit 10 = 1, R = a1l 7 01100 Y = R 7 01101 Z : R 7 01110 do, redo 10 01111 R = Y 7

1000x call JA 4 10010 ifc CON F2 3 10011 if CON F2 3 10100 Y = y[l] F1 1 10101 Z : y[l] F1 2 10110 x = Y F1 1 10111 y[l] = Y F1 1 11000 Bit 0 = 0, branch indirect 5 11000 Bit 0 = 1, F3 ALU 3a 11001 y = a0 x = X F1 1 11010 Cond. branch qualifier 6 11011 y = a1 x = X F1 1 11100 Y = a0[l] F1 1 11101 Z : y x = X F1 2 11110 Bit 5 = 0, F4 ALU (BMU) 3b 11110 Bit 5 = 1, direct addressing 9a 11111 y = Y x = X F1 1

Table 42. D Field

Specifies a destination accumulator.

DRegister

0 Accumulator 0 1 Accumulator 1

(continued)

Table 43.

Specifies transfer accumulator.

Table 44. S Field

Specifies a source accumulator.

Table 45. F1 Field

Specifies the multiply/ALU function.

Table 46. X Field

Specifies the addressing of ROM data in two-operand multiply/ALU instructions. Specifies the high or low half of an accumulator or the y register in one-operand multiply/ALU instructions.

Field

aT Register

0 Accumulator 1 1 Accumulator 0

SRegister

0 Accumulator 0 1 Accumulator 1

F1 Operation

0000 aD = pp = x * y 0001 aD = aS + pp = x * y

pt++

pt++i

0010 p = x * 0011 aD = aS – pp = x * y 0100 aD = p 0101 aD = aS + p 0110 nop 0111 aD = aS – p 1000 aD = aS | y 1001 aD = aS ^ y 1010 aS & y 1011 aS – y 1100 aD = y 1101 aD = aS + y 1110 aD = aS & y 1111 aD = aS – y

X Operation

Two-Operand Multiply/ALU

0 1

One-Operand Multiply/ALU 0aTl, yl 1aTh, yh

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Table 47. Y Field

Specifies the form of register indirect addressing with postmodification.

Y Operation

0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111

r0++

r0--

* r0++j

r1++

r1--

* r1++j

r2++

r2--

* r2++j

r3++

r3--

* r3++j

Table 48. Z Field

Specifies the form of register indirect compound addressing with postmodification.

ZOperation

0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111

r0zp

r0pz

r0m2

r0jk

r1zp

r1pz

r1m2

r1jk

r2zp

r2pz

r2m2

r2jk

r3zp

r3pz

r3m2

r3jk

Table 49. F2 Field

Specifies the special function to be performed.

F2 Operation

0000 aD = aS >> 1 0001 aD = aS << 1 0010 aD = aS >> 4 0011 aD = aS << 4 0100 aD = aS >> 8 0101 aD = aS << 8 0110 aD = aS >> 16 0111 aD = aS << 16 1000 aD = p 1001 aDh = aSh + 1 1010 aD = ~aS 1011 aD = rnd(aS) 1100 aD = y 1101 aD = aS + 1 1110 aD = aS 1111 aD = – aS

Table 50. CON Field

Specifies the condition for special functions and conditional control instructions.

CON Condition CON Condition

00000 mi 01110 true 00001 pl 01111 false 00010 eq 10000 gt 00011 ne 10001 le 00100 lvs 10010 allt 00101 lvc 10011 allf 00110 mvs 10100 somet 00111 mvc 10101 somef 01000 heads 10110 oddp 01001 tails 10111 evenp 01010 c0ge 11000 mns1 01011 c0lt 11001 nmns1 01100 c1ge 11010 npint 01101 c1lt 11011 njint

11100 lock

Other

Reserved — —

codes

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Table 51. R Field

Specifies the register for data move instructions.

R Register R Register

000000 r0 100000 inc 000001 r1 100001 ins 000010 r2 100010 sdx2 000011 r3 100011 saddx 000100 j 100100 cloop 000101 k 100101 mwait 000110 rb 100110 saddx2 000111 re 100111 sioc2 001000 pt 101000 cbit 001001 pr 101001 sbit 001010 pi 101010 ioc 001011 i 101011 jtag 001100 p 101100 Reserved 001101 pl 101101 Reserved 001110 pllc 101110 Reserved 001111 Reserved 101111 Reserved 010000 x 110000 a0 010001 y 110001 a0l 010010 yl 110010 a1 010011 auc 110011 a1l 010100 psw 110100 timerc 010101 c0 110101 timer0 010110 c1 110110 tdms2 010111 c2 110111 srta2 011000 sioc 111000 powerc 011001 srta 111001 Reserved 011010 sdx 111010 ar0 011011 tdms 111011 ar1 011100 phifc 111100 ar2 011101 pdx0 111101 ar3 011110 Reserved 111110 Reserved 011111 ybase 111111 alf

(continued)

Table 52. B Field

Specifies the type of branch instruction (except software interrupt).

B Operation

000 return 001 ireturn 010 goto pt 011 call pt 1xx R eserved

Table 53. DR Field

DR Value Register

0000 r0 0001 r1 0010 r2 0011 r3 0100 a0 0101 a0l 0110 a1 0111 a1l 1000 y 1001 yl 1010 p 1011 pl 1100 x 1101 pt 1110 pr 1111 psw

Table 54. I Field

Specifies a register for short immediate data move instructions.

IRegister

00 r0/j 01 r1/k 10 r2/rb 11 r3/re

Table 55. SI Field

Specifies when the conditional branch qualifier instruction should be interpreted as a software interrupt instruction.

SI Operation

0 Not a software interrupt 1 Software interrupt

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NI Field

Number of instructions to be loaded into the cache. Zero implies redo operation.

K Field

Number of times the NI instructions in cache are to be executed. Zero specifies use of value in

JA Field

12-bit jump address.

R/W Field

A zero specifies a write, *(O) = DR. A one specifies a read, DR = *(O).

Table 56. F3 Field

Specifies the operation in an F3 ALU instruction.

F3 Operation

1000 aD = aS[h, l] | {aT, IM16, p} 1001 aD = aS[h, l] ^ {aT, IM16, p} 1010 aS[h, l] & {aT, IM16, p} 1011 aS[h, l] – {aT, IM16, p} 1101 aD = aS[h, l] + {aT, IM16, p} 1110 aD = aS[h, l] & {aT, IM16, p} 1111 aD = aS[h, l] – {aT, IM16, p}

(continued)

cloop

Table 58. BMU Encodings

F4 AR Operation

0000 00xx aD = aS >> arM 0001 00xx aD = aS << arM 0000 10xx aD = aS >>> arM 0001 10xx aD = aS <<< arM 1000 0000 aD = aS 1001 0000 aD = aS 1000 1000 aD = aS 1001 1000 aD = aS 1100 0000 aD = aS >> IM16 1101 0000 aD = aS << IM16 1100 1000 aD = aS >>> IM16 1101 1000 aD = aS <<< IM16 0000 1100 aD = exp(aS) 0001 11xx aD = norm(aS, arM) 1110 0000 aD = extracts(aS, IM16) 0010 00xx aD = extracts(aS, arM) 1110 0100 aD = extractz(aS, IM16) 0010 01xx aD = extractz(aS, arM) 1110 1000 aD = insert(aS, IM16) 1010 10xx aD = insert(aS, arM) 0111 0000 aD = aS:aa0 0111 0001 aD = aS:aa1

Note: xx encodes the auxiliary register to be used. 00 (ar0), 01(ar1),

10 (ar2), or 11(ar3).

>> aS

<< aS >>> aS <<< aS

Table 57. SRC2 Field

Specifies operands in an F3 ALU instruction.

SRC2 Operands

00 aS l, IM16 10 aSh, IM16 01 aS, aT 11 aS, p

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6 Signal Descriptions

EXTERNAL

MEMORY

INTERFACE

SERIAL

INTERFACE #1

AB[15:0] DB[15:0]

RWN EXM

EROM

ERAMHI

ERAMLO

DO1

OLD1

OCK1

OBE1

DI1 ILD1 ICK1

IBF1

SYNC1 SADD1 DOEN1

16 16

DSP1627

RSTB CKO CKI2 CKI STOP

INT[1:0]

VEC[3:0] OR IOBIT[4:7] IACK TRAP

PSTAT OR DO2 PODS OR OLD2 PCSN OR OCK2 POBE OR OBE2 PBSEL OR SYNC2 PB0 OR ICK2 PIDS OR ILD2

PB1 OR DI2 PIBF OR IBF2 PB2 OR DOEN2 PB3 OR SADD2

PB[7:4] OR IOBIT[3:O]

TDI TDO

TCK TMS

SYSTEM

INTERFACE

CONTROL I/O

INTERFACE

PARALLEL HOST

INTERFACE

SERIAL INTERFACE #2

AND CONTROL I/O

INTERFACE

JTAG TEST

INTERFACE

Figure 8. DSP1627 Pinout by Interface

Figure 8 shows the pinout for the DSP1627. The signals can be separated into five interfaces as shown. These interfaces and the signals that comprise them are described below.

6.1 System Interface

The system interface consists of the clock, interrupt, and reset signals for the processor.

RSTB Reset:

causes the processor to enter the reset state. The auc, powerc, sioc, sioc2, phifc, pdx0, tdms, tdms2, timerc, timer0, sbit (upper byte), inc, ins (except OBE, OBE2,

Negative assertion. A high-to-low transition

5-4006 (C)

and PODS status bits set), alf (upper 2 bits, AWAIT and LOWPR), ioc, rb, and re registers are cleared. The mwait register is initialized to all 0s (zero wait-states) unless the EXM pin is high and the INT1 pin is low. In that case, the mwait register is initialized to all 1s (15 wait-states).

Reset clears IACK, VEC[3:0]/IOBIT[4:7], IBF, and IBF2. The DAU condition flags are not affected by reset. IOBIT[7:0] are initialized as inputs. If any of the IOBIT pins are switched to outputs (by writing sbit), their initial value will be logic zero (see Table 40, Register Settings After Reset).

Upon negation of the signal, the processor begins execution at location 0x0000 in the active memory map (see Section 4.4, Memory Maps and Wait-States).

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■

6 Signal Descriptions

(continued)

CKI Input Clock:

A mask-programmable option selects one of three possible input buffers for the CKI pin (see Section 7, Mask-Programmable Options, and Table 1, Pin Descriptions). The internal CKI from the output of the selected input buffer can then drive the internal processor clock directly (1X) or drive the on-chip PLL (see Section 4.13 ). The PLL al lows th e CKI input clock to be at a lower frequency than the internal processor clock.

CKI2 Input Clock 2:

Used with mask-programmable input clock options which require an external crystal or small signal differential across CKI and CKI2 (see Table 1, Pin Descriptions). When the CMOS option is selected, this pin should be tied to V

SSA

STOP

A free-running output clock that runs at the CKI rate, independent of the is only available with the crystal and small-signal clock options. When the PLL is selected, the CKO frequency equals the input CKI frequency regardless of how the PLL is programmed.

■

A logic 0.

■

A logic 1.

powerc

INT[1:0] Processor Interrupts 0 and 1:

Positive asserti on. Hardware interrupt inputs to the DSP1627. Each is enabled via the inc register. When enabled and asserted, each cause the processor to vector to the memory location described in Table 4. INT1 is used in conjunction with EXM to select the desired reset initialization of the mwait register (see Table 36). When both INT0 and RSTB are asserted, all output and bidirectional pins (except TDO, which 3-states by JTAG control) are put in a 3-state condition.

Stop Input Clock:

Negative assertion. A high-to-low transition synchronously stops all of the internal processor clocks leaving the processor in a defined state. Returning the pin high will synchronously restart the processor clocks to continue program execution from where it left off without any loss of state. This hardware feature has the same effect as setting the NOCK bit in the powerc register (see Table 39).

CKO Clock Out:

Buffered output clock with options programmable via the ioc register (see Table 38). The selectable CKO options (see Tables 38 and 29) ar e as follow s:

■

A free-running output clock at the frequency of the internal processor clock; runs at the internal ring oscillator frequency when SLOWCKI is enabled.

■

A wait-stated clock based on the internal instruction cycle; runs at the internal ring oscillator frequency when SLOWCKI is enabled.

■

A sequenced, wait-stated clock based on the EMI sequencer cycle; runs at the internal ring oscillator frequency when SLOWCKI is enabled.

VEC[3:0] Interrupt Output Vector:

These four pins indicate which interrupt is currently being serviced by the device. Table 4 shows the code associated with each interrupt condition. VEC[3:0] are multiplexed with IOBIT[4:7].

IACK Interrupt Acknowledge:

Positive assertion. IACK signals when an interrupt is being serviced by the DSP1627. IACK remains asserted while in an interrupt service routine, and is cleared when the ireturn instruction is executed.

TRAP Trap Signal:

Positive assertion. When asserted, the processor is put into the trap condition, which normally causes a branch to the location 0x0046. The hardware development system (HDS) can configure the trap pin to cause an HDS trap, which causes a branch to location 0x0003. Although normally an input, the pin can be configured as an output by the HDS. As an output, the pin can be used to signal an HDS breakpoint in a multiple processor environment.

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(continued)

6.2 External Memory Interface

The external memory interface is used to interface the DSP1627 to external memory and I/O devices. It supports read/write operations from/to program and data memory spaces. The interface supports four external memory segments. Each external memory segment can have an independent number of software-programmable wait-states. One hardware address is decoded, and an enable line is provided, to allow glueless I/O interfacing.

AB[15:0] External Memory Address Bus:

This 16-bit bus supplies the address for read or write operations to the external memory or I/O. During external memory accesses, AB[15:0] retain the value of the last valid external access.

DB[15:0] External Memory Data Bus:

data bus is used for read or write operations to the external memory or I/O.

Output only.

This 16-bit bidirectional

EROM External ROM Enable Signal:

When asserted, the signal indicates an access to external program memory (see Table 5, Instruction/Coefficient Memory Maps). This signal's leading edge can be delayed via the ioc register (see Table 38).

ERAMHI External RAM High Enable Signal:

tion. When asserted, the signal indicates an access to external data memory addresses 0x8000 through 0xFFFF (see Table 6, Data Memory Map). This signal's leading edge can be delayed via the ioc register (see Table 38).

ERAMLO External RAM Low Enable Signal:

tion. When asserted, the signal indicates an access to external data memory addresses 0x4100 through 0x7FFF (see Table 6, Data Memory Map). This signal's leading edge can be delayed via the ioc register (see Table 38).

Negative assertion.

Negative asser-

RWN Read/Write Not:

the memory access is a read operation. When a logic 0, the memory access is a write operation.

EXM External Memory Select:

latched into the device on the rising edge of RSTB. The value of EXM latched in determines whether the internal ROM is addressable in the instruction/coefficient memory map. If EXM is low, internal ROM is addressable. If EXM is high, only external ROM is addressable in the instruction/coefficient memory map (see Table 5, Instruction/Coefficient Memory Maps). EXM chooses between MAP1 or MAP2 and between MAP3 or MAP4.

When a logic 1, the pin indicates that

Input only. This signal is

External I/O Enable Signal:

asserted, the signal indicates an access to external data memory addresses 0x4000 through 0x40FF (see Table 6, Data Memory Map). This memory segment is intended for memory-mapped I/O. This signal's leading edge can be delayed via the ioc register (see Table 38).

Negative assertion. When

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6.3 Serial Interface #1

The serial interface pins implement a full-featured synchronous/asynchronous serial I/O channel. In addition, several pins offer a glueless TDM interface for multiprocessing communication applications (see Figure 5, Multiprocessor Communicat ion s and Conn ections).

DI1 Data Input:

ICK1, either LSB or MSB first, according to the sioc register MSB field (see Table 22).

ICK1 Input Clock:

mode, ICK1 is an output; in passive mode, ICK1 is an input, according to the sioc register ICK field (see Table 22). Input has typically 0.7 V hysteresis.

ILD1 Input Load:

sdx[in], from the input shift register isr. A falling edge of ILD1 indicates the beginning of a serial input word. In active mode, ILD1 is an output; in passive mode, ILD1 is an input, according to the sioc register ILD field (see Table 22). Input has typically 0.7 V hysteresis.

IBF1 Input Buffer Full:

when the input buffer, sdx[in], is filled. IBF1 is negated by a read of the buffer, as in a0 = sdx. IBF1 is also negated by asserting RSTB.

DO1 Data Output:

shift register (osr), either LSB or MSB first (according to the sioc register MSB field). DO1 changes on the rising edges of OCK1. DO1 is 3-stated when DOEN1 is high.

DOEN1 Data Output Enable:

when not in the multiprocessor mode. DO1 and SADD1 are enabled only if DOEN1 is low. DOEN1 is bidirectional when in the multiprocessor mode (tdms register MODE field set). In the multiprocessor mode, DOEN1 indicates a valid time slot for a serial output.

Serial data is latched on the rising edge of

The clock for serial input data. In active

The clock for loading the input buffer,

Positive assertion. IBF1 is asserted

The serial data output from the output

Negative assertion. An input

OCK1 Output Clock:

mode, OCK1 is an output; in passive mode, OCK1 is an input, according to the sioc register OCK field (see Table 22). Input has typically 0.7 V hysteresis.

OLD1 Output Load:

ister, osr, from the output buffer sdx[out]. A falling edge of OLD1 indicates the beginning of a serial output word. In active mode, OLD1 is an output; in passive, OLD1 is an input, according to the sioc register OLD field (see Table 22). Input has typically 0.7 V hysteresis.

OBE1 Output Buffer Empty:

serted when the output buffer, sdx[out], is emptied (moved to the output shift register for transmission). It is cleared with a write to the buffer, as in sdx = a0. OBE1 is also set by asserting RSTB.

SADD1

Serial Address:

stream typically used for addressing during multiprocessor communication between multiple DSP16xx devices. In multiprocessor mode, SADD1 is an output when the tdms time slot dictates a serial transmission; otherwise, it is an input. Both the source and destination DSP can be identified in the transmission. SADD1 is always an output when not in multiprocessor mode and can be used as a second 16-bit serial output. See the

The clock for se rial output da ta. In active

The clock for loading the output shift reg-

Positive assertion. OBE1 is as-

Negative assertion. A 16-bit serial bit

DSP1611/17/18/27 Digital Signal Processor Information Manual

ed when DOEN1 is high. When used on a bus, SADD1 should be pulled high through a 5 kΩ resistor.

SYNC1 Multiprocessor Synchronization:

the multiprocessor mode, a falling edge of SYNC1 indicates the first word (time slot 0) of a TDM I/O stream and causes the resynchronization of the active ILD1 and OLD1 generators. SYNC1 is an output when the tdms registe r SY NC fi eld is se t (i. e ., se lect s th e ma ste r DSP and uses time slot 0 for transmit). As an input, SYNC1 must be tied low unless part of a TDM interface. When used as an output, SYNC1 = [ILD1/OLD1]/8 or 16, depending on the setting of the SYNCSP field of the tdms register. When configured as described above, SYNC1 can be used to generate a slow clock for SIO operations. Input has typically 0.7 V hysteresis.

for additional information. SADD1 is 3-stat-

Typically used in

64 Lucent Technologies Inc.

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Data Sheet March 2000 DSP1627 Digital Signal Processor

6 Signal Descriptions

(continued)

6.4 Parallel Host Interface or Serial Interface #2 and Control I/O Interface

This interface pin multiplexes a parallel host interface with a second serial I/O interface and a 4-bit I/O interface. The interface selection is made by writing the ESIO2 bit in the ioc register (see Table 38 and Section 4.1). The functions and signals for the second SIO correspo nd exactly wi th those in SIO #1. Therefore, the pin descriptions below discuss only PHIF and BIO pin functionality.

PB[7:0] Parallel I/O Data Bus:

used to input data to, or output data from, the PHIF. Note that PB[3:0] are pin multiplexed with SIO2 func-

tionality, and PB[7:4] are pin multiplexed with BIO unit pins IOBIT[3:0] (see Section 4.1).

PCSN Peripheral Chip Select Not:

PCSN is an input. While PCSN is low, the data strobes PIDS and PODS are enabled. While PCSN is high, the DSP1627 ignores any activity on PIDS and PODS.

PBSEL Peripheral Byte Select:

software. Selects the hig h or low by te of pd x0 avai lable for host accesses.

PSTAT Peripheral Status Select:

logic 0, the PHIF will output the pdx0[out] register on the PB bus. When a logic 1, the PHIF will output the contents of the PSTAT register on PB[7:0].

PIDS Parallel Input Data Strobe:

figurable to support both

Intel

In an external device to indicate that data is available on the PB bus. The DSP latches data on the PB bus on the rising edge (low-to-high transition) of PIDS or PCSN, whichever comes first.

In write strobe. The external device sets PIDS(PRWN*) to a logic 0 to indicate that data is available on the PB bus (write operation by the external device). A logic 1 on PIDS(PRWN*) indicates an external read operation by the external device.

mode: Negative assertion. PIDS is pulled low by

Motorola

mode: PIDS(PRWN*) functions as a read /

This 8-bit bidirectional bus is

Negative assertion.

An input pin, configurable in

PSTAT is an input. When a

An input pin, software con-

Intel

and

Motorola

protocols.

PODS Parallel Output Data Strobe:

configurable to support both cols.

Intel

mode: Negative assertion. When PODS is pulled low by an external device, the DSP1627 places the contents of the parallel output register, pdx0, onto the PB bus.

Motorola

level. The external device uses PODS(PDS strobe for both read and write operations.

PIBF Parallel Input Buffer Full:

assertion; configurable in software. This flag is cleared after reset, indicating an empty input buffer pdx0[in].

PIBF is set immediately after the rising edge of PIDS or PCSN, indicating that data has been latched into the pdx0[in] register. When the DSP1627 reads the contents of this register, emptying the buffer, the flag is cleared.

Configured in software, PIBF may become the logical OR of the PIBF and POBE flags.

POBE Parallel Output Buffer Empty:

itive assertion; configurable in software. This flag is set after reset, indicating an empty output buffer pdx0[out].

POBE is set immediately after the rising edge of PODS or PCSN, indicating that the data in pdx0[out] has been driven onto the PB bus. When the DSP1627 writes to pdx0[out], filling the buffer, this flag is cleared.

mode: Software-configurable assertion

An input pin, software

Intel

and

Motorola

An output pin with positive

An output pin with pos-

proto-

) as its data

6.5 Control I/O Interface

This interface is used for status and control operations provided by the bit I/O unit of the DSP1627. It is pin multiplexed with the PHIF and VEC[3:0] pins (see Section

4.1). Setting the ESIO2 and EBIOH bits in the ioc register provides a full 8-bit BIO interface at the associated pins.

IOBIT[7:0] I/O Bits [7:0]:

configured as either an input or an output. As outputs, they can be independently set, toggled, or cleared. As inputs, they can be tested independently or in combinations for various data patterns.

Motorola

Each of these bits can be independently

mode signal name.

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Data Sheet

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6 Signal Descriptions

(continued)

6.6 JTAG Test Interface

The JTAG test interface has features that allow programs and data to be downloaded into the DSP via four pins. This provides extensive test and diagnostic capability. In addition, internal circuitry allows the device to be controlled through the JTAG port to provide on-chip in-circuit emulation. Lucent Technologies provides hardware and software tools to interface to the on-chip HDS via the JTAG port.

Note:

The DSP1627 provides all JTAG/ standard test capabilities including boundary scan. See the

DSP1611/17/18/27 Digital Signal

Processor Information Manual

formation on the JTAG test interface.

TDI Test Data Input:

scanned data and instructions are input on this pin. This pin has an internal pull-up resistor.

JTAG serial input signal. All serial-

IEEE

1149.1

for additional in-

TDO Test Data Output:

scanned data and status bits are output on this pin.

TMS Test Mode Select:

when combined with TCK, controls the scan operations. This pin has an internal pull-up resistor.

TCK Test Clock:

all data into the port through TDI, and out of the port through TDO, and controls the port by latching the TMS signal inside the state-machine controller.

JTAG serial output signal. Serial-

JTAG mode control signal that,

JTAG serial shift clock. This signal clocks

66 Lucent Technologies Inc.

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Data Sheet March 2000 DSP1627 Digital Signal Processor

7 Mask-Programmable Options

The DSP1627 contains a ROM that is mask-programmable. The selection of several programmable features is made when a custom ROM is encoded. These features select the input clock options, the instruction/coefficient memory map option, and the hardware emulation or ROM security option, as summarized in Table 59.

Table 59. DSP1627 ROM Options

Features Options Comments

Input Clock CMOS Level

Memory Map DSP1627x36

ROM Security Nonsecure

* 1627hds.v

and must reside in the first 4 Kwords of ROM.

† crc16.v

of ROM. See the

(# indicates the current version number) is the relocatable HDS object code. It uses approximately 140 words

is the cyclic redundancy check object code. It uses approximately 75 words and must reside in the first 4 Kwords

DSP1600 Support Tools Manual

Small Signal

Crystal

DSP1627x32

Secure

for detailed information.

2.7 V, 3.0 V, and 5.0 V.

2.7 V, 3.0 V, and 5.0 V. 36 Kwords IROM, no EROM in MAP1 or MAP3.

32 Kwords IROM, 16 Kwords EROM in MAP1 and MAP3. Specify and l ink Specify and link

1627hds.v

crc16.v

, allows emulation.

†

, no emulation capability.

7.1 Input Clock Options

For all input options, the input clock CKI can run at some fraction of the internal clock frequency by setting the PLL multiplication factors appropriately (see Section 4.12, Clock Synthesis). When the PLL is bypassed, the input clock CKI frequency is the internal clock frequency.

If the mask option for using an external crystal is chosen, the internal oscillator may be used as a noninverting input buffer by supplying a CMOS level to the CKI pin and leaving the CKI2 pin open.

7.2 Memory Map Options

The DSP1627 offers a DSP1627x36 or a DSP1627x32 where the difference is in the instruction/coefficient memory maps. The DSP1627x36 contains 36 Kwords of internal ROM (IROM), but it doesn’t support the use of IROM and external ROM (EROM) in the same memory map. The DSP1627x32 supports the use of only 32 Kwords of IROM with 16 Kwords of EROM in the same memory map. See Section 4.4 Memory Maps and Wait-States for further description.

7.3 ROM Security Options

The DSP1600 Hardware Development System (HDS) provides on-chip in-circuit emulation and requires that the relocatable HDS code be linked to the application code. This code's object file is called 1627hds.v unique version identifier. Refer to the DSP1627-ST software tools release for more specific information. If on-chip in-circuit emulation is desired, a nonsecure ROM must be chosen. If ROM security is desired with the DSP1627, the HDS cannot be used. To provide testing of the internal ROM contents on a secure ROM device, a cyclic redundancy check (CRC) program is called by and linked with the user's source code. The CRC code resides in the first 4 Kwords of ROM.

, where # is a

See the

DSP1600 Support Tools Manual

for more detailed information.

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Data Sheet

DSP1627 Digital Signal Processor March 2000

8 Device Characteristics

8.1 Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability.

External leads can be bonded and soldered safely at temperatures of up to 300 °C. Voltage Range on V

Voltage Range on V

Voltage Range on Any Pin ............................................................................................ .V

Power Dissipation................................................................................................................................................ 1 W

Ambient Temperature Range ......................................................................................................... –40 °C to +85 °C

Storage Temperature Range

with Respect to Ground Using Devices Designed for 5 V Operation.............–0.5 V to +7 V

with Respect to Ground Using Devices Designed for 3 V Operation..........–0.5 V to +4.6 V

– 0.5 V to V

....................................................................................................................–

65 °C to +150 °C

+ 0.5 V

8.2 Handling Precautions

All MOS devices must be handled with certain precautions to avoid damage due to the accumulation of static charge. Although input protection circuitry has been incorporated into the devices to minimize the effect of this static buildup, proper precautions should be taken to avoid exposure to electrostatic discharge during handling and mounting. Lucent Technologies employs a human-body model for ESD susceptibility testing. Since the failure voltage of electronic devices is dependent on the current, voltage, and hence, the resistance and capacitance, it is important that standard values be employed to establish a reference by which to compare test data. Values of 100 pF and 1500 Ω are the most common and are the values used in the Lucent Technologies human-body model test circuit. The breakdown voltage for the DSP1627 is greater than 2000 V.

8.3 Recommended Operating Conditions

Table 60. Recommended Operating Conditions

Maximum

Instruction Rate

(MIPS)

50 20 ns CMOS, small-signal,

80 12.5 ns CMOS, small-signal,

100 10 ns CMOS, small-signal,

70 14 ns CMOS, small-signal,

90 11 ns CMOS, small-signal,

Device Speed Input Clock Package Supply Voltage

(V)

Min Max Min Max

crystal

BQFP

or TQFP

BQFP

or TQFP

BQFP

or TQFP

BQFP

or TQFP

BQFP

or TQFP

2.7 3.3 –40 85

3.0 3.6 –40 85

4.75 5.25 –40 85

Ambient Temperature

TA (

°°°°

The ratio of the instruction cycle rate to the input clock frequency is 1:1 without the PLL (referred to as 1X operation) and M/(2N) with the PLL selected (see Section 4.12). Device speeds greater than 50 MIPS do not support 1X operation; use the PLL.

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Data Sheet March 2000 DSP1627 Digital Signal Processor

8 Device Characteristics

(continued)

8.4 Package Thermal Considerations

The recommended operating temperature specified above is based on the maximum power, package type, and maximum junction temperature. The following equations describe the relationship between these parameters. If the applications' maximum power is less than the worst-case value, this relationship determines a higher maximum ambient temperature or the maximum temperature measured at top dead center of the package.

= TJ – P x

TDC

where TA is the still-air ambient temperature and T dead center of the package.

Maximum Junction Temperature (T 100-pin BQFP Maximum Thermal Resistance in Still-Air-Ambient ( 100-pin BQFP Maximum Thermal Resistance, Junction to Top Dead Center ( Maximum Junction Temperature (T 100-pin TQFP Maximum Thermal Resistance in Still-Air-Ambient ( 100-pin TQFP Maximum Thermal Resistance, Junction to Top Dead Center (

WARNING: Due to package thermal constraints, proper precautions in the user's application should be tak-

J-TDC

is the temperature measured by a thermocouple at the top

TDC

) in 100-Pin BQFP................................................................................. 125 °C

).....................................................55 °C/W

) in 100-Pin TQFP ................................................................................. 125 °C

) ..................................................... 30 °C/W

)...............................12 °C/W

J-TDC

).................................6 °C/W

J-TDC

en to avoid exceeding the maximum junction temperature of 125 °C. Otherwise, the device will be affected adversely.

Lucent Technologies Inc. 69

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Data Sheet

DSP1627 Digital Signal Processor March 2000

9 Electrical Characteristics and Requirements

The following electrical characteristics are preliminary and are subject to change. Electrical characteristics refer to the behavior of the device under specified conditions. Electrical requirements refer to conditions imposed on the user for proper operation of the device. The parameters below are valid for the conditions described in Section 8.3, Recommended Operating Cond iti ons .

Table 61. Electrical Characteristics and Requirements

Parameter Symbol Min Max Unit

Input Voltage:

Low High

Input Current (except TMS, TDI):

Low (V High (VIH = 5.25 V, VDD = 5.25 V)

Input Current (TMS, TDI):

Low (V High (VIH = 5.25 V, VDD = 5.25 V)

Output Low Voltage:

Low (I Low (IOL = 50 µA)

Output High Voltage:

High (I High (IOH = –50 µA)

Output 3-State Current:

Low (V High (VDD = 5.25 V, VIH = 5.25 V)

Input Capacitance

= 0 V, VDD = 5.25 V)

= 2.0 mA)

= –2.0 mA)

= 5.25 V, VIL = 0 V)

V V

OZL

OZH

IL IH

OL OL

OH OH

–0.3 0.3 * V

0.7 * V

VDD + 0.3 V

–5 —

—5µA

–100 —

—5µA

—0.4V —0.2V

VDD – 0.7 — V VDD – 0.2 — V

–10 —

—10µA

CI — 5 pF

Table 62. Electrical Requirements for Mask-Programmable Input Clock Options

Parameter Symbol Min Max Unit

CKI CMOS Level Input Voltage:

Low High

Small-signal Peak-to-pea k Volta ge

(on CKI)

Small-signal Input Duty Cycle Small-signal Input Voltage Range

(pins: CKI, CKI2) Small-signal Buffer Frequency Range Frequency Range of Fundamental Mode or Overtone

Crystal Series Resistance of Fundamental Mode or Overtone

Crystal (pins: CKI, CKI2) Mutual Capacitance of Crystal

(includes board stray capa citance)

* The small-signal buffer must be used in single-ended mode where an ac waveform (sine or square) is applied to CKI and a dc voltage approx-

imately equal to the average value of CKI is appl ied to CKI2, as shown in t he figure below. The maximum allowable ripple on CKI2 is 100 mV.

† Duty cycle for a sine wave is defined as the percentage of time during each clock cycle that the voltage on CKI exceeds the voltage on CKI2.

CKI

CKI2

†

–0.3 0.3 * V

0.7 * V

VDD + 0.3 V

Vpp 0.6 — V

DCyc 45 55 %

Vin 0.2 * V

0.6 * V

fss — 35 MHz

fX 5 25 MHz

RS — 40

C0 — 7 pF

Ω

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Data Sheet March 2000 DSP1627 Digital Signal Processor

9 Electrical Characteristics and Requirements

Additional Electrical Requirements with Crystal Option:

(continued)

See Section 13, Crystal Electrical Characteristics and

Requirements.

Table 63. PLL Electrical Specifications, VCO Frequency Ranges

Parameter Symbol Min Max Unit

VCO frequency range (V VCO frequency range (V VCO frequency range (V

10%)

= 3 V

= 3.0 V – 3.6 V)* f

= 5 V ± 5%)* f

VCO VCO VCO

50 160 MHz 50 200 MHz 70 180 MHz

Input Jitter at CKI — — 200 ps-rms

* The M and N counter values in the pllc register must be set so that the VCO will operate in the appropriate range (see Table 63). Choose the

lowest value of N and then the appropriate value of M for

INTERNAL CLOCK

CKI

x (M/(2N)) =

VCO

/2.

Table 64. PLL Electrical Specifications and pllc Register Settings

pllc13 (ICP) pllc12

(SEL5V)

pllc[11:8]

(LF[3:0])

Typical Lock-in Time (

µµµµ

23—24 2.7 V – 3.6 V 1 0 1011 30 21—22 2.7 V – 3.6 V 1 0 1010 30 19—20 2.7 V – 3.6 V 1 0 1001 30 16—18 2.7 V – 3.6 V 1 0 1000 30 12—15 2.7 V – 3.6 V 1 0 0111 30

8—11 2.7 V – 3.6 V 1 0 0110 30

2—7 2.7 V – 3.6 V 1 0 0100 30 19—20 5 V ± 5% 1 1 1110 30 17—18 5 V ± 5% 1 1 1101 30

16 5 V ± 5% 1 1 1100 30 14—15 5 V ± 5% 1 1 1011 30 12—13 5 V ± 5% 1 1 1010 30 10—11 5 V ± 5% 1 1 1001 30

8—9 5 V ± 5% 1 1 1000 30

75 V ± 5% 1 1 0111 30 5—6 5 V ± 5% 1 1 0110 30 2—4 5 V ± 5% 1 1 0101 30

* Lock-in time represents the time following assertion of the PLLEN bit of the pllc register during which the PLL output clock is un stable. The

DSP must operate from the 1X CKI input clock or from the slow ring oscillator while the PLL is locking. Completion of the lock-in interval is indicated by assertion of the LOCK flag.

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Data Sheet

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9 Electrical Characteristics and Requirements

VDD – 0.1

(V)

– 0.2

– 0.3

– 0.4

01020304051525354550

IOH (mA)

(continued)

DEVICE UNDER

TEST

5-4007 (F).a

(V)

Figure 9. Plot of V

vs. IOH Under Typical Operating Conditions

0.4

0.3

0.2

0.1

0 5 10 15 20 25 30 35 40 45 50

(mA)

DEVICE

UNDER

TEST

5-4008 (F).b

Figure 10. Plot of V

vs. IOL Under Typical Operating Conditions

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Data Sheet March 2000 DSP1627 Digital Signal Processor

9 Electrical Characteristics and Requirements

(continued)

9.1 Power Dissipation

Power dissipation is highly dependent on DSP program activity and the frequency of operation. The typical power dissipation listed is for a selected application. The following electrical characteristics are preliminary and are subject to change.

Table 65. Power Dissipation and Wake-Up Latency

Operating Mode

(Unused Inputs at VDD or VSS)

Normal Operation ioc = 0x0180

PLL Disabled CKI & CKO = 40 MHz CMOS 220 74 214 72 — —

Crystal Oscillator 241 80 235 78 — —

Small Signal 223 76 217 74 — — CKI & CKO = 0 MHz CMOS 0.19 0.067 0.19 0.067 — —

Small Signal 3.0 1.1 3.0 1.1 — — Normal Operation ioc = 0x0180

PLL Enabled

pllc = 0xFC0E

CKI = 10 MHz CKO = 40 MHz CMOS 228 77 222 75 — — Crystal Oscillator 249 83 243 81 — —

Small Signal 231 78 225 77 — —

Standard Sleep, Ext ernal Interrupt

alf[15] = 1, ioc = 0x0180

PLL Disabled During Sleep

CMOS

Crystal Oscillator

Small Signal

Standard Sleep, Ext ernal Interrupt

alf[15] = 1, ioc = 0x0180

PLL Enabled During Sleep

CMOS 33.2 10.9 25.8 7.5 — 3T*

Crystal Oscillator 54.0 17.1 46.0 14.0 — 3T*

Small Signal 36.0 12.4 28. 8 9.2 — 3T*

Sleep with Slow Internal Clock

Crystal/Small Signal Enabled

powerc[15:14] = 01,

alf[15] = 1, ioc = 0x0180

PLL Disabled During Sleep

CMOS 1.4 0.4 1.1 0.3 1.5 µs5.0 µs1.5 µs + t

Crystal Oscillator 21.9 6.2 21.8 6.1 1.5 µs5.0 µs1.5 µs + tL5.0 µs + t

Small Signal 3.9 2.1 3.8 2.0 1.5 µs5.0 µs1.5 µs + tL5.0 µs + t

Typical Power Dissipation (mW) Wake-Up Latency

I/O Units ON

powerc[7:4] = 0x0

I/O Units OFF

powerc[7:4] = 0xf

(PLL Not Used

During Wake State)

(PLL Used

During Wake State)

5 V 3 V 5 V 3 V 5 V 3 V 5 V 3 V

Power Management Modes

25.2 8.4 17.8 5.6 3T*

46.2 14.0 38.8 12.0 3T*

28.0 9.8 20.8 7.2 3T*

CKO = 40 MHz

3T* + t 3T* + t 3T* + t

L† L† L†

5.0 µs + t

L L L

* T = CKI clock cycle for 1X input clock option or T = CKI clock cycle divided by M/(2N) for PLL clock option (see Section 4.12).

†

= PLL lock time (see Table 64).

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Data Sheet

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9 Electrical Characteristics and Requirements

Table 65. Power Dissipation and Wake-Up Latency

Operating Mode

(Unused inputs at VDD or VSS)

Typical Power Dissipation (mW) Wake-Up Latency

I/O Units ON

powerc[7:4] = 0x0

(continued)

I/O Units OFF

powerc[7:4] = 0xf

(continued)

During Wake State)

(PLL Not Used

(PLL Used

During Wake State)

5 V 3 V 5 V 3 V 5 V 3 V 5 V 3 V

Sleep with Slow Internal Clock

Crystal/Small Signal Enabled

powerc[15:14] = 01,

alf[15] = 1, ioc = 0x0180

PLL Enabled During Sleep

CMOS 8.3 3.0 7.5 2.7 — 1.5 µs5.0 µs

Crystal Oscillator 27.5 9.9 24.5 8.8 — 1.5 µs5.0 µs

Small Signal 10.0 4.5 10.0 4.0 — 1.5 µs5.0 µs

Sleep with Slow Internal Clock

Crystal/Small Signal Disabled

powerc[15:14] = 11,

alf[15] = 1, ioc = 0x0180

PLL Disabled During Sleep

Crystal Oscillator

Small Signal

0.67 0.24 0.56 0.16 20 ms

0.67 0.24 0.56 0.16 20 µs

20 µs + t 20 µs + t

Software Stop

powerc[15:12] = 0011

PLL Disabled During STOP

CMOS

0.19 0.067 0.19 0.067 3T*

3T* + t

Software Stop

powerc[15:12] = 1111

PLL Disabled During STOP

Crystal Oscillator

Small Signal

0.19 0.067 0.19 0.067 20 ms

0.19 0.067 0.19 0.067 20 µs

20 µs +t

20 µs + t

Hardware Stop (STOP = VSS)

powerc[15:12] = 0000

PLL Disabled During STOP

CMOS 0.19 0.067 0.19 0.067 3T* —

Crystal Oscillator 20.0 6.0 20.0 6.0 3T* —

Small Signal 3.0 1.1 3.0 1.1 3T* —

Hardware Stop (STOP = V

)

powerc[15:12] = 0000

PLL Enabled During STOP

CMOS 5.6 2.4 5.6 2.4 3T* 3T*

Crystal Oscillator 25.6 8.4 25.6 8.4 3T* 3T*

Small Signal 8.6 3.5 8.6 3.5 3T* 3T*

* T = CKI clock cycle for 1X input clock option or T = CKI clock cycle divided by M/(2N) for PLL clock option (see Section 4.12).

†

= PLL lock time (see Table 64).

L† L†

L†

The power dissipation listed is for internal power dissipation only. Total power dissipation can be calculated on the basis

of the application by adding C x V

x f for each output, where C is the additional load capacitance and f is the output

frequency.

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Data Sheet March 2000 DSP1627 Digital Signal Processor

9 Electrical Characteristics and Requirements

(continued)

Power dissipation due to the input buffers is highly dependent on the input voltage level. At full CMOS levels, essentially no dc current is drawn. However, for levels between the power supply rails, especially at or near the threshold of V

/2, high currents can flow. Although input and I/O buffers may be left untied (since the input voltage levels

of the input and I/O buffers are designed to remain at full CMOS levels when not driven by the DSP), it is still recommended that unused input and I/O pins be tied to V biguities. Further, if I/O pins are tied high or low, they should be pulled fully to V

or VDD through a 10 kΩ resistor to avoid application am-

or VDD.

WARNING: The device needs to be clocked for at least six CKI cycles during reset after powerup. Otherwise,

high currents may

flow.

10 Timing Characteristics for 5 V Operation

The following timing characteristics and requirements are preliminary information and are subject to change. Timing characteristics refer to the behavior of the device under specified conditions. Timing requirements refer to conditions imposed on the user for proper operation of the device. All timing data is valid for the following conditions:

= –40 °C to +85 °C (See Section 8.3.)

= 5 V ± 5%, VSS = 0 V (See Section 8.3.)

Capacitance load on outputs ( C Output characteristics can be derated as a function of load capacitance (C All outputs: 0.03 ns/pF ≤ dt/dC

) = 50 pF, except for CKO, where CL = 20 pF.

≤ 0.06 ns/pF for 10 ≤ CL ≤ 100 pF at VIH for rising edge and at VIL for falling edge.

For example, if the actual load capacitance is 30 pF instead of 50 pF, the derating for a rising edge is (30 – 50) pF x 0.06 ns/pF = 1.2 ns

less

than the specified rise time or delay that includes a rise time.

Test conditions for inputs:

■

Rise and fall times of 4 ns or less

■

Timing reference levels for delays = VIH, V

Test conditions for outputs (unless noted otherwise):

■

= 50 pF; except for CKO, where C

LOAD

■

Timing reference levels for delays = VIH, V

■

3-state delays measured to the high-impedance state of the output driver

LOAD

= 20 pF

For the timing diagrams, see Table 62 for input clock requirements. Unless otherwise noted, CKO in the timing diagrams is the free-running CKO.

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10 Timing Characteristics for 5 V Operation

10.1 DSP Clock Generation

1X CKI*

†

CKO

‡

CKO

* See Table 62 for input clock electrical requirements. † Free-running clock. ‡ Wait-stated clock (see Table 38).

W = number of wait-states.

EXTERNAL MEMORY CYCLE

W = 1

(continued)

t6, t6a

5-4009 (F).a

Figure 11. I/O Clock Timing Diagram

Table 66. Timing Requirements for Input Clock

Abbreviated Reference Parameter

14 ns and 11 ns

Min Max Unit

t1 Clock In Period (high to high) 20 —

†

t2 Clock In Low Time (low to high) 10 — ns t3 Clock In High Time (high to low) 10 — ns

* Device speeds greater than 50 MIPS do not support 1X operation. Use the PLL. † Device is fully static, t1 is tested at 100 ns for 1X input clock option, and memory hold time is tested at 0.1 s.

Table 67. Timing Characteristics for Input Clock and Output Clock

Abbreviated Reference Parameter 14 ns 11 ns Unit

Min Max Min Max

t4 Clock Out High Delay — 10 — 8 ns t5 Clock Out Low Delay (high to low) — 10 — 8 ns t6 Clock Out Period (low to low) T* — T* — ns

t6a Clock Out Period with SLOWCKI Bit

0.74 1.6 0.74 1.6

Set in powerc Register (low to low)

* T = internal clock period, set by CKI or by CKI and the PLL parameters.

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10 Timing Characteristics for 5 V Operation

(continued)

10.2 Reset Circuit

The DSP1627 has a powerup reset circuit that automatically clears the JTAG controller upon powerup. If the supply voltage falls below V being used—by applying six low-to-high clock edges on TCK with TMS held high, followed by the usual RSTB and CKI reset sequence. Figure 12 shows two separate events: an initial powerup and a powerup following a drop in the power supply voltage.

* See Table 60, Recommended Operating Condiitons.

RAMP

CKI

TCK

TMS

MIN* and a reset is required, the JTAG controller must be reset—even if the JTAG port isn’t

MIN

0.4 V

t146

MIN

0.4 V t9

t151

t152

t153 t153

RSTB

t10

PINS

Notes: See Table 62 for CKI electrical requirements and Table 71 for TCK timing requirements.

When both INT0 and RSTB are asserted, all output and bidirectional pins (except TDO, which 3-states by JTAG control) are put in a 3-state condition. With RSTB asserted and INT0 not asserted, EROM, ERAMHI, ERAMLO, IO, DSEL, and RWN outputs remain high, and CKO remains a free-running clock.

TMS and TDI signals have internal pull-up devices.

t11

t10

t11

5-2253 (F).a

Figure 12. Powerup Reset and Chip Reset Timing Diagram

Table 68. Timing Requirements for Powerup Reset and Chip Reset

Abbreviated Reference Parameter Min Max Unit

t8 Reset Pulse (low to high) 6T — ns

t9 V

t146 V

t151 TMS Hig h t152 JTAG Reset to CMOS

Ramp — 10 ms

MIN to RSTB Low CMOS

Crystal* Small-signal

RSTB Low Crystal*

Small-Signal

20 ms – 6 * T

0 if 6 * T

20 µs – 6 * T

0 if 6 * T

6 * T

TCK

2T 20 20

TCK†

2T if 6 * T

≥ 20 ms

if 6 * T

TCK

≥ 20 µs

TCK

< 20 ms

TCK

< 20 µs

— — —

—ns —

— — — —

t153 RSTB Rise (low to high) — 95 ns

* With external components as specified in Table 62.

TCK

†T

= t12 = TCK period. See Table 71 for TCK timing requirements.

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10 Timing Characteristics for 5 V Operation

(continued)

Table 69. Timing Characteristics for Powerup Reset and Chip Reset

Abbreviated Reference Parameter Min Max Unit

t10 RSTB Disable Time (low to 3-state) — 100 ns t11 RSTB Enable Time (high to valid) — 100 ns

Note:

The device needs to be clocked for at least six CKI cycles during reset after powerup. Otherwise, high currents may flow.

10.3 Reset Synchronization

t5 + 2 x t6

CKI

RSTB

CKO

t126

CKO

* See Table 62 for input clock electrical requirements. Note: CKO

and CKO2 are two possible CKO states before reset. CKO is free-running.

Figure 13. Reset Synchronization Timing

Table 70. Timing Requirements for Reset Synchronization Timing

Abbreviated Reference Parameter Min Max Unit

t126 Reset Setup (high to high) 1.5 T/2 – 5 ns

5-4011 (F).a

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10 Timing Characteristics for 5 V Operation

10.4 JTAG I/O Specifications

t12

t156

t20

TCK

TMS

TDI

TDO

t155

t15

t17

t16

t18

Figure 14. JTAG Timing Diagram

(continued)

t14t13

t19

5-4017 (F)

Table 71. Timing Requirements for JTAG Input/Output

Abbreviated Refe rence Parameter Min Max Unit

t12 TCK Period (high to high) 50 — ns t13 TCK High Time (high to low) 22.5 — ns t14 TCK Low Time (low to high) 22.5 — ns t15 TMS Setup Time (valid to high) 7.5 — ns t16 TMS Hold Time (high to invalid) 2 — ns t17 TDI Setup Time (valid to high) 7.5 — ns t18 TDI Hold Time (high to invalid) 2 — ns

Table 72. Timing Characteristics for JTAG Input/Output

Abbreviated Reference Parameter Min Max Unit

t19 TDO Delay (low to valid) — 19 ns t20 TDO Hold (low to invalid) 0 — ns

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10 Timing Characteristics for 5 V Operation

10.5 Interrupt

CKO

t21

INT[1:0]

IACK

VEC[3:0]

* CKO is free-running. † IACK assertion is guaranteed to be enclosed by VEC[3:0] assertion.

t22

t23

†

t24

(continued)

t25

t26

5-4018 (F)

Figure 15. Interrupt Timing Diagram

Table 73. Timing Requirements for Interrupt

Abbreviated Reference Parameter Min Max Unit

t21 Interrupt Setup (high to low) 15 — ns t22 INT Assertion Time (high to low) 2T — ns

Note: Interrupt is asserted during an interruptible instruction and no other pending interrupts.

Table 74. Timing Characteristics for Interrupt

Abbreviated Reference Parameter Min Max Unit

t23 IACK Assertion Time (low to high) — T/2 + 7.5 ns t24 VEC Assertion Time (low to high) — 9.5 ns t25 IACK Invalid Time (low to low) — 7.5 ns t26 VEC Invalid Time (low to low) — 9.5 ns

Note: Interrupt is asserted during an interruptible instruction and no other pending interrupts.

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10 Timing Characteristics for 5 V Operation

(continued)

10.6 Bit Input/Output (BIO)

t144

O H

CKO

IOBIT

(OUTPUT)

IOBIT

(INPUT)

Table 75. Timing Requirements for BIO Input Read

Abbreviated Reference Parameter Min Max Unit

O L

t29

O H

O L

t27

I H

I L

DATA INPUT

t28

VALID OUTPUT

Figure 16. Write Outputs Followed by Read Inputs (cbit = Immediate; a1 = sbit)

t27 IOBIT Input Setup Time (valid to high) 12 — ns t28 IOBIT Input Hold Time (high to invalid) 0 — ns

5-4019 (F).a

Table 76. Timing Characteristics for BIO Output

Abbreviated Refe rence Parameter Min Max Unit

t29 IOBIT Output Valid Time (low to valid) — 7.5 ns

t144 IOBIT Output Hold Time (low to invalid) 1 — ns

t144

OH –

CKO

O L–

t29

IOBIT

(OUTPUT)

IOBIT

(INPUT)

V V

OH –

O L–

V V

IH –

I L–

t141

TEST INPUT

VALID OUTPUT

t142

Figure 17. Write Outputs and Test Inputs (cbit = Immediate)

Table 77. Timing Requirements for BIO Input Test

Abbreviated Reference Parameter Min Max Unit

t141 IOBIT Input Setup Time (valid to low) 12 — ns t142 IOBIT Input Hold Time (low to invalid) 0 — ns

5-4019 (F).b

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10 Timing Characteristics for 5 V Operation

(continued)

10.7 External Memory Interface

The following timing diagrams, characteristics, and requirements do not apply to interactions with delayed external memory enables unless so stated. See the detailed description of the external memory interface including other functional diagrams.

CKO

ENABLE

* W = number of wait-states.

Table 78. Timing Characteristics for External Memory Enables (EROM, ERAMHI, IO, ERAMLO)

Abbreviated Reference Parameter Min Max Unit

t33 CKO to ENABLE Active (low to low) 0 7 ns t34 CKO to ENABLE Inactive (low to high) –1 6 ns

DSP1611/17/18/27 Digital Signal Processor Information Manual

t34t33

= 0

Figure 18. Enable Transition Timing

for a

5-4020 (F).b

Table 79. Timing Characteristics for Delayed External Memory Enables (ioc = 0x000F)

Abbreviated Reference Parameter Min Max Unit

t33 CKO to Delayed ENABLE Active (low to low) T/2 – 2 T/2 + 7 ns

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(MWAIT = 0 x 2222)

W* = 2

CKO

t127

t129

t128

t150

Figure 19. External Memory Data Read Timing Diagram

ENABLE

* W = number of wait-states.

(continued)

t130

READ DATA

READ ADDRESS

5-4021 (F).a

Table 80. Timing Characteristics for External Memory Access

Abbreviated Reference Parameter Min Max Unit

t127 Enable Width (low to high) T(1 + W) – 4 — ns t128 Address Valid (enable low to valid) — 2 ns

Table 81. Timing Requirements for External Memory Read (EROM, ERAMHI, IO, ERAMLO)

Abbreviated

Reference

Parameter 14 ns 11 ns Unit

Min Max Min Max

t129 Read Data Se tup (valid to enable high) 12 — 11 — ns t130 Read Data Hold (enable high to hold) 0 — 0 — ns t150 External Memory Access Time (valid to valid) — T(1 + W) – 13 — T(1 + W) – 12 ns

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10 Timing Characteristics for 5 V Operation

(MWAIT = 0x1002)

W* = 2

CKO

ERAMLO

EROM

RWN

t133

t136

t135

WRITE ADDRESS READ ADDRESS

WRITE DATA READ

t134

(continued)

W* = 1

t131

t132

5-4022 (F).a

* W = number of wait-states.

Figure 20. External Memory Data Write Timing Diagram

Table 82. Timing Characteristics for External Memory Data Write (All Enables)

Abbreviated

Reference

Parameter 14 ns 11 ns Unit

Min Max Min Max

t131 Write Overlap (enable low to 3-state) — 0 — 0 ns t132 RWN Advance (RWN high to enable high) 0 — 0 — ns t133 RWN Delay (enable low to RWN low) 0—0—ns t134 Write Data Setup (data valid to RWN high) T(1 + W)/2 – 3 — T(1 + W)/2 – 2 — ns t135 RWN Width (low to high) T(1 + W) – 5.5 — T(1 + W) – 5.5 — ns t136 Write Address Setup (address valid to RWN

0—0—ns

low)

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10 Timing Characteristics for 5 V Operation

(MWAIT = 0x1002)

W* = 2

CKO

ERAMLO

EROM

DB WRITE READ

t138

RWN

WRITE ADDRESS READ ADDRESS

(continued)

W* = 1

t131

t137

t139

5-4023 (F).a

* W = number of wait-states.

Figure 21. Write Cycle Followed by Read Cycle

Table 83. Timing Characteristics for Write Cycle Followed by Read Cycle

Abbreviated Reference Parameter Mi n Ma x Unit

t131 Write Overlap (enable low to 3-state) — 0 ns t137 Write Data 3-state (RWN high to 3-state) — 2 ns t138 Write Data Hold (RWN high to data hold) 0 — ns t139 Write Address Hold (RWN high to address hold) 0 — ns

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10 Timing Characteristics for 5 V Operation

(continued)

10.8 PHIF Specifications

For the PHIF, "READ" means read by the external user (output by the DSP); "WRITE" is similarly defined. The 8-bit reads/ writes are identical to one-half of a 16-bit access.

PCSN

PODS

PIDS

PBSEL

PSTAT

PB[7:0]

16-bit READ

–

t41

–

t45

t49

t42

t46

t50

t154

t43

t47

t51

16-bit WRITE

t44

t48

t52

5-4036 (F)

Figure 22. PHIF

Table 84. Timing Requirements for PHIF

Mode Signaling (Read and Write) Timing Diagram

Intel

Mode Signaling

Intel

Abbreviated Reference Param ete r Min Max Unit

t41 PODS to PCSN Setup (low to low) 0 — ns t42 PCSN to PODS Hold (high to high) 0 — ns t43 PIDS to PCSN Setup (low to low) 0 — ns

t44 PCSN to PIDS Hold (high to high) 0 — ns t45* PSTAT to PCSN Setup (valid to low) 4.5 — ns t46* PCSN to PSTAT Hold (high to invalid) 0 — ns t47* PBSEL to PCSN Setup (valid to low) 4.5 — ns t48* PCSN to PBSEL Hold (high to invalid) 0 — ns t51* PB Write to PCSN Setup (valid to high) 7.5 — ns t52* PCSN to PB Write Hold (high to invalid) 4 — ns

* This timing diagram for t he PH IF p ort s hows acc ess es usin g t he P CSN sign al t o in iti ate an d compl ete a t ran sactio n. The t rans ac tions can also be initiat ed

and completed with th e PIDS and PO DS signals. An output tran saction (read) is initiate d by PCSN or PODS going low, whic hever comes last. For example, the timing requirements referenced to PCSN going low, t45 and t49, should be referenced to PODS going low, if PODS goes low after PCSN. An output transaction is completed by PCSN or PODS going high, whichever comes first. An input transaction is initiated by PCSN or PIDS going low, whichever comes last. An input tr ansact ion is co mpleted by PCS N or P IDS goin g hi gh, whic heve r comes f irst . All r equi remen ts re fe renced to PCSN app ly to PI DS or PODS, if PIDS or PODS is the controlling signal.

Table 85. Timing Characteristics for PHIF

Mode Signaling

Intel

Abbreviated Reference Param ete r Min Max Unit

t49* PCSN to PB Read (low to valid) — 13 ns t50* PCSN to PB Read Hold (high to invalid) 3 — ns

* This timing diagram for t he PH IF p ort s hows acc ess es usin g t he P CSN sign al t o in iti ate an d compl ete a t ran sactio n. The t rans ac tions can also be initiat ed

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10 Timing Characteristics for 5 V Operation

PCSN

PODS

PIDS

PBSEL

POBE

PIBF

16-bit READ

t55

t56

t53

16-bit WRITE

t55

t56

t55

t56

t54

(continued)

8-bit READ

t53

t56

8-bit WRITE

t55

t56

t54

5-4037 (F).a

Figure 23. PHIF

Table 86. Timing Requirements for PHIF

Mode Signaling (Pulse Period and Flags) Timing Diagram

Intel

Mode Signaling

Intel

Abbreviated Reference Parameter Min Max Unit

t55 PCSN/PODS/PIDS Pulse Width (high to low) 15 — ns t56 PCSN/PODS/PIDS Pulse Width (low to high) 15 — ns

Table 87. Timing Characteristics for PHIF

Mode Signaling

Intel

Abbreviated Reference Parameter Min Max Unit

t53* t54*

* t53 should be referenced to the rising edge of PCSN or PODS, whichever comes first. t54 should be referenced to the rising edge of PCSN

or PIDS, whichever comes first.

† POBE and PIBF may be programmed to be the opposite logic levels shown in the diagram (positive assertion levels shown). t53 and t54 apply

to the inverted levels as well as those shown.

PCSN/PODS to POBE PCSN/PIDS to PIBF

†

(high to high)

†

(high to high)

—15ns —15ns

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10 Timing Characteristics for 5 V Operation

16-bit READ 16-bit WRITE

PCSN

PRWN

PBSEL

PSTAT

PB[7:0]

PDS

Figure 24. PHIF

t41

t43

t45

t49

Motorola

t42

t44

t46

t50

t154

Mode Signaling (Read and Write) Timing Diagram

(continued)

t43 t44

t47

t51

t48

t52

5-4038 (F).a

Table 88. Timing Requirements for PHIF

Motorola

Mode Signaling

Abbreviated Reference Parameter Min Max Unit

t41

t42

†

to PCSN Setup (valid to low)

PDS PCSN to PDS† Hold (high to invalid)

0—ns 0—ns

t43 PRWN to PCSN Setup (valid to low) 4.5 — ns

t44 PCSN to PRWN Hold (high to invalid) 0 — ns t45* PSTAT to PCSN Setup (valid to low) 4.5 — ns t46* PCSN to PSTAT Hold (high to invalid) 0 — ns t47* PBSEL to PCSN Setup (valid to low) 4.5 — ns t48* PCSN to PBSEL Hold (high to invalid) 0 — ns t51* PB Write to PCSN Setup (valid to high) 8 — ns t52* PCSN to PB Write Hold (high to invalid) 4 — ns

* This timing diagram for the PHIF port shows accesses using the PCSN signal to initiate and complete a transaction. The tr ansac tions can also

be initiated and completed with the PDS signal. An input/output transaction is initiated by PCSN or PDS going low, whichever comes las t. For example, the timing requirements referenced to PCSN going low, t45 and t49, should be referenced to PDS going low, if PDS goes low after PCSN. An input/output transaction is completed by PCSN or PDS going high, whichever comes first. All requirements referenced to PCSN should be referenced to PDS, if PDS is the controlling signal. PRWN should never be used to initiate or complete a transaction.

† PDS is programmable to be active-high or active-low. It is shown active-low in Figures 24 and 25. POBE and PIBF may be programmed to be

the opposite logic levels shown in the diagram. t53 and t54 apply to the inverted levels as well as those shown.

Table 89. Timing Characteristics for PHIF

Motorola

Mode Signaling

Abbreviated Reference Parameter Min Max Unit

t49* PCSN to PB Read (low to valid) — 13 ns t50* PCSN to PB Read (high to invalid) 3 — ns

* This timing diagram for the PHIF port shows accesses using the PCSN signal to initiate and complete a transaction. The tr ansac tions can also

† PDS is programmable to be active-high or active-low. It is shown active-low in Figures 24 and 25. POBE and PIBF may be programmed to be

the opposite logic levels shown in the diagram. t53 and t54 apply to the inverted levels as well as those shown.

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10 Timing Characteristics for 5 V Operation

16-bit WRITE

t55

t56

t55

t56

t54

PCSN

PDS

PRWN

PBSEL

POBE

PIBF

VIL–

16-bit READ

–

t55

–

t56

–

– –

t53

– –

(continued)

8-bit READ

t53

t56

8-bit WRITE

t55

t56

t54

5-4039 (F).a

Figure 25. PHIF

Motorola

Table 90. Timing Characteristics for PHIF

Mode Signaling (Pulse Period and Flags) Timing Diagram

Motorola

Mode Signaling

Abbreviated Reference Parameter Min Max Unit

t53* t54*

* An input/output transaction is initiated by PCSN or PDS going low, whichever comes last. For example, t53 and t54 should be referenced to

PDS going low, if PDS goes low after PCSN. An input/output transaction is completed by PCSN or PDS going high, whichever comes first. All requirements referenced to PCSN should be referenced to PDS, if PDS is the controlling signal. PRWN should never be used to initiate or complete a transaction.

† PDS is programmable to be active-high or active-low. It is shown active-low in Figures 24 and 25. POBE and PIBF may be programmed to

be the opposite logic levels shown in the diagram. t53 and t54 apply to the inverted levels as well as those shown.

PCSN/PDS PCSN/PDS

Table 91. Timing Requirements for PHIF

†

to POBE† (high to high)

†

to PIBF† (high to high)

Motorola

Mode Signaling

—15ns —15ns

Abbreviated Reference Parameter Min Max Unit

t55 PCSN/PDS/PRWN Pulse Width (high to low) 15 — ns t56 PCSN/PDS/PRWN Pulse Width (low to high) 15 — ns

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10 Timing Characteristics for 5 V Operation

PCSN

PODS (PDS*)

PIDS (PRWN*)

PBSEL

PSTAT

PB[7:0]

t47

t45

t49

(continued)

t50

t48

t46

t154

5-4040 (F).a

Motorola

Table 92. Timing Requirements for

mode signal name.

Figure 26. PHIF

Intel

Motorola

Mode Signaling (Status Register Read) Timing Diagram

Intel

and

Motorola

Mode Signaling (Status Register Read)

Abbreviated Reference Parameter Min Max Unit

†

t45

‡

t46

†

t47

‡

t48

† t45, t47, and t49 are referenced to the falling edge of PCSN or PODS(PDS), whichever occurs last. ‡ t46, t48, and t50 are referenced to the rising edge of PCSN or PODS(PDS), whichever occurs first.

Table 93. Timing Characteristics for

PSTAT to PCSN Setup (valid to low) PCSN to PSTAT Hold (high to invalid) PBSEL to PCSN Setup (valid to low) PCSN to PBSEL Hold (high to invalid)

Intel

and

Motorola

Mode Signaling (Status Register Read)

4.5 — ns 0—ns

Abbreviated Reference Parameter Min Max Unit

†

t49

‡

t50

PCSN to PB Read (low to valid) PCSN to PB Read Hold (high to invalid)

—13 ns

3—ns

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10 Timing Characteristics for 5 V Operation

VIL–

–

t57

– –

RSTB

POBE

PIBF

(continued)

t58

5-4775 (F)

Figure 27. PHIF, PIBF, and POBE Reset Timing Diagram

Table 94. PHIF Timing Characteristics for PHIF, PIBF, and POBE Reset

Abbreviated Reference Parameter Min Max

Unit

t57 RSTB Disable to POBE/PIBF* (high to valid) — 19 ns t58 RSTB Enable to POBE/PIBF* (low to invalid) 3 19 ns

* After reset, POBE and PIBF always go to the levels shown, indicating output buffer empty and input buffer empty. The DSP progr am, however,

may later invert the definition of the logic levels for POBE and PIBF. t57 and t58 continue to apply.

CKO

POBE

PIBF

† POBE and PIBF can be programmed to be active-high or active-low. They are shown active-high. The timing characteristic for active-low is

the same as for active-high

–

t59

VOH–

†

–

VOH–

†

–

t59

5-4776 (F)

Figure 28. PHIF, PIBF, and POBE Disable Timing Diagram

Table 95. PHIF Timing Characteristics for POBE and PIBF Disable

Abbreviated Reference Parameter Min Max Unit

t59 CKO to POBE/PIBF Disable (high/low to disable) — 15 ns

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10 Timing Characteristics for 5 V Operation

10.9 Serial I/O Specifications

t70

ICK

ILD

IBF

* N = 16 or 8 bits.

–

– –

t72 t71

t74t75

t73

t75

t77 t78

B0 B1

Figure 29. SIO Passive Mode Input Timing Diagram

(continued)

BN – 1* B0

t79

5-4777 (F)

Table 96. Timing Requirements for Serial Inputs

Abbreviated Reference Parameter Min Max Unit

t70

Clock Period (high to high)

‡

—† t71 Clock Low Time (low to high) 18 — ns t72 Clock High Time (high to low) 18 — ns t73 Load High Setup (high to high) 6 — ns t74 Load Low Setup (low to high) 6 — ns t75 Load High Hold (high to invalid) 0 — ns t77 Data Setup (valid to high) 5 — ns t78 Data Hold (high to invalid) 0 — ns

† Device is fully static; t70 is tested at 200 ns. ‡ For Multiprocessor mode, see note in Section 10.10.

Table 97. Timing Characteristics for Serial Outputs

Abbreviated Reference Parameter Min Max Unit

t79 IBF Delay (high to high) — 22 ns

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ICK

ILD

IBF

* ILD goes high during bit 6 (of 0:15), N = 8 or 16.

Table 98. Timing Requirements for Serial Inputs

–

t101

t76a

–

t77 t78

–

B0 B1

Figure 30. SIO Active Mode Input Timing Diagram

(continued)

BN – 1 B0

t79

5-4778 (F)

Abbreviated Reference Parameter Min Max Unit

t77 Data Setup (valid to high) 5 — ns t78 Data Hold (high to invalid) 0 — ns

Table 99. Timing Characteristics for Serial Outputs

Abbreviated Reference Parameter Min Max Unit

t76a ILD Delay (high to low) — 22 ns t101 ILD Hold (high to invalid) 4 — ns

t79 IBF Delay (high to high) — 22 ns

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Data Sheet

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10 Timing Characteristics for 5 V Operation

t80

t81t82

OCK

OLD

DO*

SADD

DOEN

OBE

–

t85

t83

–

t88

–

t94

–

t84

t85

B0 B1 B7 BN – 1

AD0

(continued)

AD1

t96

AD7

t90t90t87

t93t93t92

AS7

t89

t95

5-4796 (F)

* See sioc register, MSB field to determine if B0 is the MSB or LSB. See sioc register, ILEN field to determine if the DO word length is 8 bits or

16 bits.

Figure 31. SIO Passive Mode Output Timing Diagram

Table 100. Timing Requirements for Serial Inputs

Abbreviated Reference P ara met er Min Max Unit

t80

Clock Period (high to high)

‡

—†

ns t81 Clock Low Time (low to high) 18 — ns t82 Clock High Time (high to low) 18 — ns t83 Load High Setup (high to high) 6 — ns t84 Load Low Setup (low to high) 6 — ns t85 Load Hold (high to invalid) 0 — ns

† Device is fully static; t80 is tested at 200 ns. ‡ For multiprocessor mode, see note in Section 10.10.

Table 101. Timing Characteristics for Serial Outputs

Abbreviated Reference Parameter Min Max Unit

t87 Data Delay (high to valid) — 22 ns t88 Enable Data Delay (low to active) — 22 ns t89 Disable Data Delay (high to 3-state) — 22 ns t90 Data Hold (high to invalid) 4 — ns t92 Address Delay (high to valid) — 22 ns t93 Address Hold (high to invalid) 4 — ns t94 Enable Delay (low to active) — 22 ns t95 Disable Delay (high to 3-state) — 22 ns t96 OBE Delay (high to high) — 22 ns

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Data Sheet March 2000 DSP1627 Digital Signal Processor

10 Timing Characteristics for 5 V Operation

–

OCK

OLD

SADD

DOEN

OBE

* OLD goes high at the end of bit 6 of 0:15.

–

t102 t86a

–

t88

–

t94

–

B0 B1 B7 BN – 1

AD0

(continued)

AD1

t96

t90t90t87

t89

t95

5-4797 (F)

AD7

t93t93t92

AS7

Figure 32. SIO Active Mode Output Timing Diagram

Table 102. Timing Characteristics for Serial Outputs

Abbreviated Reference Parameter Min Max Unit

t86a OLD Delay (high to low) — 22 ns t102 OLD Hold (high to invalid) 4 — ns

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Data Sheet

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10 Timing Characteristics for 5 V Operation

CKO

ICK

OCK

ICK/OCK*

ILD

OLD

SYNC

–

t97

–

t99

–

t76a

t101

–

t86a

t102

t103

t105

t98

t100

(continued)

t76b

t101

t86b

t102

t104

t105

5-4798 (F)

* See sioc register, LD field.

Figure 33. Serial I/O Active Mode Clock Timing

Table 103. Timing Characteristics for Signal Generation

Abbreviated Reference Parameter Min Max Unit

t97 ICK Delay (high to high) — 15 ns t98 ICK Delay (high to low) — 15 ns

t99 OCK Delay (high to high) — 15 ns t100 OCK Delay (high to low) — 15 ns t76a ILD Delay (high to low) — 22 ns t76b ILD Delay (high to high) — 22 ns t101 ILD Hold (high to invalid) 4 — ns t86a OLD Delay (high to low) — 22 ns t86b OLD Delay (high to high) — 22 ns t102 OLD Hold (high to invalid) 4 — ns t103 SYNC Delay (high to low) — 22 ns t104 SYNC Delay (high to high) — 22 ns t105 SYNC Hold (high to invalid) 4 — ns

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Data Sheet March 2000 DSP1627 Digital Signal Processor

10 Timing Characteristics for 5 V Operation

10.10 Multiprocessor Communication

OCK/ICK

t113 t112

SYNC

DO/D1

SADD

DOEN

–

t112

t113

t116

t121

t120

(continued)

TIME SLOT 1 TIME SLOT 2

t117

B0B15B8B7B1B0B15

t114

t122

AD0AS7AS0AD7AD1AD0

t120

t115

5-4799 (F)

* Negative edge initiates time slot 0.

Figure 34. SIO Multiprocessor Timing Diagram

Note:

All serial I/O timing requirements and characteristics still apply, but the minimum clock period in passive multiprocessor mode, assuming 50% duty cycle, is calculated as (t77 + t116) x 2.

Table 104. Timing Requirements for SIO Multiprocessor Communication

Abbreviated Reference Parameter Min Max Unit

t112 Sync Setup (high/low to high) 22 — ns t113 Sync Hold (high to high/low) 0 — ns t114 Address Setup (valid to high) 9 — ns t115 Address Hold (high to invalid) 0 — ns

Table 105. Timing Characteristics for SIO Multiprocessor Communication

Abbreviated Reference* Parameter Min Max Unit

t116 Data Delay (bit 0 only) (low to valid) — 22 ns t117 Data Disable Delay (high to 3-state) — 20 ns t120 DOEN Valid Delay (high to valid) — 16 ns t121 Address Delay (bit 0 only) (low to valid) — 22 ns t122 Address Disable Delay (high to 3-state) — 20 ns

* With capacitance load on ICK, OCK, DO, SYNC, and SADD = 100 pF, add 4 ns to t116—t122.

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Data Sheet

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11 Timing Characteristics for 3.0 V Operation

= –40 °C to +85 °C (See Section 8.3.)

= 3.0 V to 3.6 V, VSS = 0 V (See Section 8.3.)

Capacitance load on outputs ( C Output characteristics can be derated as a function of load capacitance (C All outputs: 0.03 ns/pF ≤ dt/dC

) = 50 pF, except for CKO, where CL = 20 pF.

≤ 0.07 ns/pF for 10 ≤ CL ≤ 100 pF at VIH for rising edge and at VIL for falling edge.

For example, if the actual load capacitance is 30 pF instead of 50 pF, the derating for a rising edge is (30 – 50) pF x 0.06 ns/pF = 1.2 ns

less

than the specified rise time or delay that includes a rise time.

Test conditions for inputs:

■

Rise and fall times of 4 ns or less

■

Timing reference levels for delays = VIH, V

Test conditions for outputs (unless noted otherwise):

■

= 50 pF; except for CKO, where C

LOAD

■

Timing reference levels for delays = VIH, V

■

3-state delays measured to the high-impedance state of the output driver

LOAD

= 20 pF

For the timing diagrams, see Table 62 for input clock requirements. Unless otherwise noted, CKO in the timing diagrams is the free-running CKO.

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Data Sheet March 2000 DSP1627 Digital Signal Processor

11 Timing Characteristics for 3.0 V Operation

11.1 DSP Clock Generation

1X CKI*

†

CKO

‡

CKO

* See Table 62 for input clock electrical requirements. † Free-running clock. ‡ Wait-stated clock (see Table 38).

§ W = number of wait-states.

EXTERNAL MEMORY CYCLE

W = 1

(continued)

t6, t6a

5-4009 (F).a

Figure 35. I/O Clock Timing Diagram

Table 106. Timing Requirements for Input Clock

Abbreviated Reference Parameter 10 ns

Min Max Unit

t1 Clock In Period (high to high) 20

—

†

t2 Clock In Low Time (low to high) 10 — ns t3 Clock In High Time (high to low) 10 — ns

* Device speeds greater than 50 MIPS do not support 1X operation. Use the PLL. † Device is fully static, t1 is tested at 100 ns for 1X input clock option, and memory hold time is tested at 0.1 s.

Table 107. Timing Characteristics for Input Clock and Output Clock

Abbreviated Reference Parameter 10 ns Unit

Min Max

t4 Clock Out High Delay — 10 ns t5 Clock Out Low Delay (high to low) — 10 ns t6 Clock Out Period (low to low) T* — ns

t6a Clock Out Period with SLOWCKI Bit Set

0.74 3.8

in powerc Register (low to low)

* T = internal clock period, set by CKI or by CKI and the PLL parameters.

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11 Timing Characteristics for 3.0 V Operation

(continued)

11.2 Reset Circuit

The DSP1627 has a powerup reset circuit that automatically clears the JTAG controller upon powerup. If the supply voltage falls below V being used—by applying six low-to-high clock edges on TCK with TMS held high, followed by the usual RSTB and CKI reset sequence. Figure 60 shows two separate events: an initial powerup and a powerup following a drop in the power supply voltage.

* See Table 60, Recommended Operating Condiitons.

RAMP

CKI

TCK

TMS

MIN* and a reset is required, the JTAG controller must be reset—even if the JTAG port isn’t

MIN

0.4 V

t146

MIN

0.4 V t9

t151

t152

t153 t153

RSTB

t10

PINS

Notes: See Table 62 for CKI electrical requirements and Table 151 for TCK timing requirements. When both INT0 and RSTB are asserted, all output and bidirectional pins (except TDO, which 3-states by JTAG control) are put in a 3-state

condition. With RSTB asserted and INT0 not asserted, EROM, ERAMHI, ERAMLO, IO, DSEL, and RWN outputs remain high, and CKO remains a free-running clock.

TMS and TDI signals have internal pull-up devices.

t11

t10

t11

5-2253 (F).a

Figure 36. Powerup Reset and Chip Reset Timing Diagram

Table 108. Timing Requirements for Powerup Reset and Chip Reset

Abbreviated Reference Parameter Min Max Unit

t8 Reset Pulse (low to high) 6T — ns t9 V

t146 V

t151 TMS High t152 JTAG Reset to CMOS

Ramp — 10 ms

MIN to RSTB Low CMOS

Crystal* Small-Signal

RSTB Low Crystal*

Small-Signal

20 ms – 6 * T

0 if 6 * T

20 µs – 6 * T

0 if 6 * T

6 * T

TCK

20 20

TCK†

if 6 * T

≥ 20 ms

if 6 * T

TCK

≥ 20 µs

TCK

< 20 ms

TCK

< 20 µs

— — —

—ns —

— — — —

t153 RSTB (low to high) — 54 ns

* With external components as specified in Table 62.

TCK

= t12 = TCK period. See Table 151 for TCK timing requirements.

†T

100 Lucent Technologies Inc.

Datasheet DSP1627 Datasheet (AGERE)

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Features

2 Description

Table of Contents

3 Pin Information

4 Hardware Architecture

4.1 DSP1627 Architectural Overview

DSP1600 Core

Dual-Port RAM (DPRAM)

Read-Only Memory (ROM)

External Memory Multiplexer (EMUX)

Clock Synthesis

Bit Manipulation Unit (BMU)

Bit Input/Output (BIO)

Serial Input/Output Units (SIO and SIO2)

Parallel Host Interface (PHIF)

Timer

Pin Multiplexing

Power Management

Hardware Development System (HDS) Module

4.2 DSP1600 Core Architectural Overview

System Cache and Control Section (SYS)

Data Arithmetic Unit (DAU)

X Space Address Arithmetic Unit (XAAU)

4.3 Interrupts and Trap

Y Space Address Arithmetic Unit (YAAU)

Interruptibility

Vectored Interrupts

Signaling Interrupt Service Status

Clearing Interrupts

Traps

AWAIT Interrupt (Standby or Sleep Mode)

4.4 Memory Maps and Wait-States

Instruction/Coefficient Memory Map Selection

MAP1

MAP2

MAP3

MAP4

Boot from External ROM

4.5 External Memory Interface (EMI)

Wait-States

4.6 Bit Manipulation Unit (BMU)

4.7 Serial I/O Units (SIOs)

Programmable Modes

Multiprocessor Mode

Using SIO2

4.8 Parallel Host Interface (PHIF)

Programmability

Pin Multiplexing

4.9 Bit Input/Output Unit (BIO)

4.10 Timer

Pin Multiplexing

4.11 JTAG Test Port

Boundary-Scan Register

4.12 Clock Synthesis

PLL Control Signals

PLL Programming Examples

Latency

4.13 Power Management

Powerc Control Register Bits

STOP Pin

The pllc Register Bits

Await Bit of the alf Register

Power Management Sequencing

Power Management Examples Without the PLL

Power Management Examples with the PLL

5 Software Architecture

5.1 Instruction Set

Multiply/ALU Instructions

Special Function Instructions

Control Instructions

Conditional Mnemonics (Flags)

F3 ALU Instructions

F4 BMU Instructions

Cache Instruction s

Data Move Instructions

5.2 Register Settings