Datasheet TA80960CA-25, TA80960CA-16 Datasheet (Intel Corporation)

December 1994 Order Number: 271327-001

SPECIAL ENVIRONMENT 80960CA-25, -16

32-BIT HIGH-PERFORMANCE EMBEDDED PROCESSOR

#

Two Instructions/Clock Sustained Execution

#

Four 59 Mbytes/s DMA Channels with Data Chaining

#

Demultiplexed 32-bit Burst Bus with Pipelining

Y

32-bit Parallel Architecture
Ð Two Instructions/clock Execution
Ð Load/Store Architecture
Ð Sixteen 32-bit Global Registers
Ð Sixteen 32-bit Local Registers
Ð Manipulates 64-bit Bit Fields
Ð 11 Addressing Modes
Ð Full Parallel Fault Model
Ð Supervisor Protection Model

Y

Fast Procedure Call/Return Model
Ð Full Procedure Call in 4 Clocks

Y

On-Chip Register Cache
Ð Caches Registers on Call/Ret
Ð Minimum of 6 Frames Provided
Ð Up to 15 Programmable Frames

Y

On-Chip instruction Cache
Ð 1 Kbyte Two-Way Set Associative
Ð 128-bit Path to instruction Sequencer
Ð Cache-Lock Modes
Ð Cache-Off Mode

Y

High Bandwidth On-Chip Data RAM
Ð 1 Kbyte On-Chip Data RAM
Ð Sustains 128 bits per Clock Access

Y

Four On-Chip DMA Channels
Ð 59 Mbytes/s Fly-by Transfers
Ð 32 Mbytes/s Two-Cycle Transfers
Ð Data Chaining
Ð Data Packing/Unpacking
Ð Programmable Priority Method

Y

32-Bit Demultiplexed Burst Bus
Ð 128-bit internal Data Paths to

and

from Registers
Ð Burst Bus for DRAM Interfacing
Ð Address Pipelining Option
Ð Fully Programmable Wait States
Ð Supports 8-, 16- or 32-bit Bus Widths
Ð Supports Unaligned Accesses
Ð Supervisor Protection Pin

Y

Selectable Big or Little Endian Byte
Ordering

Y

High-Speed Interrupt Controller
Ð Up to 248 External interrupts
Ð 32 Fully Programmable Priorities
Ð Multi-mode 8-bit Interrupt Port
Ð Four internal DMA Interrupts
Ð Separate, Non-maskable interrupt Pin
Ð Context Switch in 750 ns Typical

Y

Product Grades Available
Ð SE3:

b

40§Ctoa110§C

SPECIAL ENVIRONMENT 80960CA-25, -16

32-BIT HIGH-PERFORMANCE EMBEDDED PROCESSOR

CONTENTS PAGE

1.0 PURPOSE АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 5

2.0 80960CA OVERVIEW ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 5

2.1 The C-Series Core АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 6

2.2 Pipelined, Burst Bus АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 6

2.3 Flexible DMA Controller АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 6

2.4 Priority Interrupt Controller АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 6

2.5 Instruction Set Summary АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 7

3.0 PACKAGE INFORMATION ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 8

3.1 Package Introduction ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 8

3.2 Pin Descriptions АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 8

3.3 80960CA Mechanical Data АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 15

3.3.1 80960CA PGA Pinout ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 15

3.4 Package Thermal Specifications ААААААААААААААААААААААААААААААААААААААААААААААААААААААА 19

3.5 Stepping Register Information ААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 21

3.6 Suggested Sources for 80960CA Accessories ААААААААААААААААААААААААААААААААААААААААА 21

4.0 ELECTRICAL SPECIFICATIONS АААААААААААААААААААААААААААААААААААААААААААААААААААААААА 22

4.1 Absolute Maximum Ratings АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 22

4.2 Operating Conditions АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 22

4.3 Recommended Connections ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 22

4.4 DC Specifications ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 23

4.5 AC Specifications ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 24

4.5.1 AC Test Conditions ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 28

4.5.2 AC Timing Waveforms АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 28

4.5.3 Derating Curves АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 32

5.0 RESET, BACKOFF AND HOLD ACKNOWLEDGE ААААААААААААААААААААААААААААААААААААААА 34

6.0 BUS WAVEFORMS АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 35

7.0 REVISION HISTORY АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 62

2

CONTENTS PAGE

LIST OF FIGURES

Figure 1 80960CA Block Diagram

ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 5

Figure 2 80960CA PGA PinoutÐView from Top (Pins Facing Down) АААААААААААААААААААААААА 17
Figure 3 80960CA PGA PinoutÐView from Bottom (Pins Facing Up) АААААААААААААААААААААААА 18
Figure 4 Measuring 80960CA PGA Case Temperature АААААААААААААААААААААААААААААААААААААА 19
Figure 5 Register g0 ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 21
Figure 6 AC Test Load ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 28
Figure 7 Input and Output Clocks Waveform АААААААААААААААААААААААААААААААААААААААААААААААА 28
Figure 8 CLKIN Waveform ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 28
Figure 9 Output Delay and Float Waveform ААААААААААААААААААААААААААААААААААААААААААААААААА 29
Figure 10 Input Setup and Hold Waveform ААААААААААААААААААААААААААААААААААААААААААААААААААА 29
Figure 11 NMI, XINT7:0 Input Setup and Hold Waveform ААААААААААААААААААААААААААААААААААААА 30
Figure 12 Hold Acknowledge Timings ААААААААААААААААААААААААААААААААААААААААААААААААААААААА 30
Figure 13 Bus Backoff (BOFF) Timings АААААААААААААААААААААААААААААААААААААААААААААААААААААА 31
Figure 14 Relative Timings Waveforms АААААААААААААААААААААААААААААААААААААААААААААААААААААА 32
Figure 15 Output Delay or Hold vs Load Capacitance АААААААААААААААААААААААААААААААААААААААА 32
Figure 16 Rise and Fall Time Derating at Highest Operating Temperature

and Minimum V

CC

ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 33

Figure 17 ICCvs Frequency and Temperature АААААААААААААААААААААААААААААААААААААААААААААААА 33
Figure 18 Cold Reset Waveform ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 35
Figure 19 Warm Reset Waveform ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 36
Figure 20 Entering the ONCE State АААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 37
Figure 21 Clock Synchronization in the 2-x Clock Mode АААААААААААААААААААААААААААААААААААААА 38
Figure 22 Clock Synchronization in the 1-x Clock Mode АААААААААААААААААААААААААААААААААААААА 38
Figure 23 Non-Burst, Non-Pipelined Requests without Wait States ААААААААААААААААААААААААААА 39
Figure 24 Non-Burst, Non-Pipelined Read Request with Wait States АААААААААААААААААААААААААА 40
Figure 25 Non-Burst, Non-Pipelined Write Request with Wait States АААААААААААААААААААААААААА 41
Figure 26 Burst, Non-Pipelined Read Request without Wait States, 32-Bit Bus АААААААААААААААА 42
Figure 27 Burst, Non-Pipelined Read Request with Wait States, 32-Bit Bus ААААААААААААААААААА 43
Figure 28 Burst, Non-Pipelined Write Request without Wait States, 32-Bit Bus АААААААААААААААА 44
Figure 29 Burst, Non-Pipelined Write Request with Wait States, 32-Bit Bus ААААААААААААААААААА 45
Figure 30 Burst, Non-Pipelined Read Request with Wait States, 16-Bit Bus ААААААААААААААААААА 46
Figure 31 Burst, Non-Pipelined Read Request with Wait States, 8-Bit Bus АААААААААААААААААААА 47
Figure 32 Non-Burst, Pipelined Read Request without Wait States, 32-Bit Bus АААААААААААААААА 48
Figure 33 Non-Burst, Pipelined Read Request with Wait States, 32-Bit Bus ААААААААААААААААААА 49
Figure 34 Burst, Pipelined Read Request without Wait States, 32-Bit Bus ААААААААААААААААААААА 50
Figure 35 Burst, Pipelined Read Request with Wait States, 32-Bit Bus АААААААААААААААААААААААА 51
Figure 36 Burst, Pipelined Read Request with Wait States, 16-Bit Bus АААААААААААААААААААААААА 52
Figure 37 Burst, Pipelined Read Request with Wait States, 8-Bit Bus ААААААААААААААААААААААААА 53

3

CONTENTS PAGE

LIST OF FIGURES (Continued)

Figure 38 Using External READY

АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 54

Figure 39 Terminating a Burst with BTERM АААААААААААААААААААААААААААААААААААААААААААААААААА 55
Figure 40 BOFF Functional Timing АААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 56
Figure 41 HOLD Functional Timing АААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 57
Figure 42 DREQ and DACK Functional Timing ААААААААААААААААААААААААААААААААААААААААААААААА 58
Figure 43 EOP Functional Timing АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 58
Figure 44 Terminal Count Functional Timing ААААААААААААААААААААААААААААААААААААААААААААААААА 59
Figure 45 FAIL Functional Timing АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 59
Figure 46 A Summary of Aligned and Unaligned Transfers for Little Endian Regions АААААААААА 60
Figure 47 A Summary of Aligned and Unaligned Transfers for Little Endian Regions

(Continued)

ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 61

Figure 48 Idle Bus Operation АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 62

LIST OF TABLES

Table 1 80960CA Instruction Set

АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 7

Table 2 Pin Description Nomenclature ААААААААААААААААААААААААААААААААААААААААААААААААААААААА 8
Table 3 80960CA Pin DescriptionÐExternal Bus Signals ААААААААААААААААААААААААААААААААААААА 9
Table 4 80960CA Pin DescriptionÐProcessor Control Signals АААААААААААААААААААААААААААААА 12
Table 5 80960CA Pin DescriptionÐDMA and Interrupt Unit Control Signals ААААААААААААААААА 14
Table 6 80960CA PGA PinoutÐIn Signal Order ААААААААААААААААААААААААААААААААААААААААААААА 15
Table 7 80960CA PGA PinoutÐIn Pin Order АААААААААААААААААААААААААААААААААААААААААААААААА 16
Table 8 Maximum TAat Various Airflows in§C АААААААААААААААААААААААААААААААААААААААААААААА 19
Table 9 80960CA PGA Package Thermal Characteristics ААААААААААААААААААААААААААААААААААА 20
Table 10 Die Stepping Cross Reference ААААААААААААААААААААААААААААААААААААААААААААААААААААА 21
Table 11 Operating Conditions (80960CA-25, -16) ААААААААААААААААААААААААААААААААААААААААААА 22
Table 12 DC Characteristics ААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 23
Table 13 80960CA AC Characteristics (25 MHz) ААААААААААААААААААААААААААААААААААААААААААААА 24
Table 14 80960CA AC Characteristics (16 MHz) ААААААААААААААААААААААААААААААААААААААААААААА 26
Table 15 Reset Conditions АААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААААА 34
Table 16 Hold Acknowledge and Backoff Conditions ААААААААААААААААААААААААААААААААААААААААА 34

4

SPECIAL ENVIRONMENT 80960CA-25, -16

1.0 PURPOSE

This document provides electrical characteristics for
the 25 and 16 MHz versions of the 80960CA. For a
detailed description of any 80960CA functional
topicÐother than parametric performanceÐconsult
the

80960CA Product Overview

(Order No. 270669)

or the

i960ÉCA Microprocessor User’s Manual

(Or­der No. 270710). To obtain data sheet updates and
errata, please call Intel’s FaxBACK

É

data-on-de­mand system (1-800-628-2283 or 916-356-3105).
Other information can be obtained from Intel’s tech­nical BBS (916-356-3600).

2.0 80960CA OVERVIEW

The 80960CA is the second-generation member of
the 80960 family of embedded processors. The
80960CA is object code compatible with the 32-bit
80960 Core Architecture while including Special
Function Register extensions to control on-chip pe­ripherals and instruction set extensions to shift
64-bit operands and configure on-chip hardware.
Multiple 128-bit internal buses, on-chip instruction
caching and a sophisticated instruction scheduler al­low the processor to sustain execution of two in­structions every clock and peak at execution of
three instructions per clock.

A 32-bit demultiplexed and pipelined burst bus pro­vides a 132 Mbyte/s bandwidth to a system’s high­speed external memory sub-system. In addition, the
80960CA’s on-chip caching of instructions, proce­dure context and critical program data substantially
decouple system performance from the wait states
associated with accesses to the system’s slower,
cost sensitive, main memory subsystem.

The 80960CA bus controller integrates full wait state
and bus width control for highest system perform­ance with minimal system design complexity. Un­aligned access and Big Endian byte order support
reduces the cost of porting existing applications to
the 80960CA.

The processor also integrates four complete data­chaining DMA channels and a high-speed interrupt
controller on-chip. DMA channels perform: single­cycle or two-cycle transfers, data packing and un­packing and data chaining. Block transfersÐin addi­tion to source or destination synchronized trans­fersÐare provided.

The interrupt controller provides full programmability
of 248 interrupt sources into 32 priority levels with a
typical interrupt task switch (‘‘latency’’) time of
750 ns.

271327–1

Figure 1. 80960CA Block Diagram

5

SPECIAL ENVIRONMENT 80960CA-25, -16

2.1 The C-Series Core

The C-Series core is a very high performance micro­architectural implementation of the 80960 Core Ar­chitecture. The C-Series core can sustain execution
of two instructions per clock (50 MIPs at 25 MHz).
To achieve this level of performance, Intel has incor­porated state-of-the-art silicon technology and inno­vative microarchitectural constructs into the imple­mentation of the C-Series core. Factors that contrib­ute to the core’s performance include:

#

Parallel instruction decoding allows issuance of
up to three instructions per clock

#

Single-clock execution of most instructions

#

Parallel instruction decode allows sustained,
simultaneous execution of two single-clock in­structions every clock cycle

#

Efficient instruction pipeline minimizes pipeline
break losses

#

Register and resource scoreboarding allow simul­taneous multi-clock instruction execution

#

Branch look-ahead and prediction allows many
branches to execute with no pipeline break

#

Local Register Cache integrated on-chip caches
Call/Return context

#

Two-way set associative, 1 Kbyte integrated in­struction cache

#

1 Kbyte integrated Data RAM sustains a four­word (128-bit) access every clock cycle

2.2 Pipelined, Burst Bus

A 32-bit high performance bus controller interfaces
the 80960CA to external memory and peripherals.
The Bus Control Unit features a maximum transfer
rate of 100 Mbytes per second (at 25 MHz). Internal­ly programmable wait states and 16 separately con­figurable memory regions allow the processor to in­terface with a variety of memory subsystems with a
minimum of system complexity and a maximum of
performance. The Bus Controller’s main features in­clude:

#

Demultiplexed, Burst Bus to exploit most efficient
DRAM access modes

#

Address Pipelining to reduce memory cost while
maintaining performance

#

32-, 16- and 8-bit modes for I/O interfacing ease

#

Full internal wait state generation to reduce sys­tem cost

#

Little and Big Endian support to ease application
development

#

Unaligned access support for code portability

#

Three-deep request queue to decouple the bus
from the core

2.3 Flexible DMA Controller

A four-channel DMA controller provides high speed
DMA control for data transfers involving peripherals
and memory. The DMA provides advanced features
such as data chaining, byte assembly and disassem­bly and a high performance fly-by mode capable of
transfer speeds of up to 45 Mbytes per second at
25 MHz. The DMA controller features a performance
and flexibility which is only possible by integrating
the DMA controller and the 80960CA core.

2.4 Priority interrupt Controller

A programmable-priority interrupt controller man­ages up to 248 external sources through the 8-bit
external interrupt port. The interrupt Unit also han­dles the four internal sources from the DMA control­ler and a single non-maskable interrupt input. The
8-bit interrupt port can also be configured to provide
individual interrupt sources that are level or edge
triggered.

Interrupts in the 80960CA are prioritized and sig­naled within 270 ns of the request. If the interrupt is
of higher priority than the processor priority, the con­text switch to the interrupt routine typically is com­plete in another 480 ns. The interrupt unit provides
the mechanism for the low latency and high through­put interrupt service which is essential for embedded
applications.

6

SPECIAL ENVIRONMENT 80960CA-25, -16

2.5 Instruction Set Summary

Table 1 summarizes the 80960CA instruction set by logical groupings. See the

i960ÉCA Microprocessor

User’s Manual

for a complete description of the instruction set.

Table 1. 80960CA Instruction Set

Data

Arithmetic Logical

Bit and Bit Field

Movement and Byte

Load Add And Set Bit
Store Subtract Not And Clear Bit
Move Multiply And Not Not Bit
Load Address Divide Or Alter Bit

Remainder Exclusive Or Scan For Bit
Modulo Not Or Span Over Bit
Shift Or Not Extract
*Extended Shift Nor Modify
Extended Multiply Exclusive Nor Scan Byte for Equal
Extended Divide Not
Add with Carry Nand
Subtract with Carry
Rotate

Comparison Branch Call/Return Fault

Compare Unconditional Branch Call Conditional Fault
Conditional Compare Conditional Branch Call Extended Synchronize Faults
Compare and Increment Compare and Branch Call System
Compare and Decrement Return
Test Condition Code Branch and Link
Check Bit

Debug

Processor

Atomic

Management

Modify Trace Controls Flush Local Registers Atomic Add
Mark Modify Arithmetic Controls Atomic Modify
Force Mark Modify Process Controls

*System Control
*DMA Control

NOTES:

Instructions marked by (*) are 80960CA extensions to the 80960 instruction set

7

SPECIAL ENVIRONMENT 80960CA-25, -16

3.0 PACKAGE INFORMATION

3.1 Package Introduction

This section describes the pins, pinouts and thermal
characteristics for the 80960CA in the 168-pin Ce­ramic Pin Grid Array (PGA) package. For complete
package specifications and information, see the

Packaging

Handbook (Order No. 240800).

3.2 Pin Descriptions

The 80960CA pins are described in this section. Ta­ble 2 presents the legend for interpreting the pin de­scriptions in the following tables. Pins associated
with the 32-bit demultiplexed processor bus are de­scribed in Table 3. Pins associated with basic proc­essor configuration and control are described in Ta­ble 4. Pins associated with the 80960CA DMA Con­troller and Interrupt Unit are described in Table 5.

All pins float while the processor is in the ONCE
mode.

Table 2. Pin Description Nomenclature

Symbol Description

I Input only pin

O Output only pin

I/O Pin can be either an input or output

Ð Pins ‘‘must be’’ connected as described

S(...) Synchronous. Inputs must meet setup

and hold times relative to PCLK2:1 for
proper operation. All outputs are
synchronous to PCLK2:1.

S(E) Edge sensitive input
S(L) Level sensitive input

A(...) Asynchronous. Inputs may be

asynchronous to PCLK2:1.

A(E) Edge sensitive input
A(L) Level sensitive input

H(...) While the processor’s bus is in the Hold

Acknowledge or Bus Backoff state, the
pin:

H(1) is driven to V

CC

H(0) is driven to V

SS

H(Z) floats
H(Q) continues to be a valid input

R(...) While the processor’s RESET pin is low,

the pin:

R(1) is driven to V

CC

R(0) is driven to V

SS

R(Z) floats
R(Q) continues to be a valid output

8

SPECIAL ENVIRONMENT 80960CA-25, -16

Table 3. 80960CA Pin DescriptionÐExternal Bus Signals

Name Type Description

A31:2 O ADDRESS BUS carries the physical address’ upper 30 bits. A31 is the most

significant address bit; A2 is the least significant. During a bus access, A31:2

S

identify all external addresses to word (4-byte) boundaries. The byte enable signals

H(Z)

indicate the selected byte in each word. During burst accesses, A3:2 increment to

R(Z)

indicate successive data cycles.

D31:0 I/O DATA BUS carries 32-, 16- or 8-bit data quantities depending on bus width

configuration. The least significant bit of the data is carried on D0 and the most

S(L)

significant on D31. When the bus is configured for 8-bit data, the lower 8 data lines,

H(Z)

D7:0 are used. For 16-bit data bus widths, D15:0 are used. For 32 bit bus widths the

R(Z)

full data bus is used.

BE3:0 O BYTE ENABLES select which of the four bytes addressed by A31:2 are active

during an access to a memory region configured for a 32-bit data-bus width. BE3

S

applies to D31:24; BE2

applies to D23:16; BE1 applies to D15:8; BE0 applies to

H(Z)

D7:0.

R(1)

32-bit bus: BE3

ÐByte Enable 3 Ðenable D31:24

BE2

ÐByte Enable 2 Ðenable D23:16

BE1

ÐByte Enable 1 Ðenable D15:8

BE0

ÐByte Enable 0 Ðenable D7:0

For accesses to a memory region configured for a 16-bit data-bus width, the
processor uses the BE3

, BE1 and BE0 pins as BHE, A1 and BLE respectively.

16-bit bus: BE3 ÐByte High Enable (BHE) Ðenable D15:8

BE2

ÐNot used (driven high or low)

BE1

ÐAddress Bit 1 (A1)

BE0

ÐByte Low Enable (BLE) Ðenable D7:0

For accesses to a memory region configured for an 8-bit data-bus width, the
processor uses the BE1

and BE0 pins as A1 and A0 respectively.

8-bit bus: BE3

ÐNot used (driven high or low)
BE2 ÐNot used (driven high or low)
BE1

ÐAddress Bit 1 (A1)
BE0

ÐAddress Bit 0 (A0)

W/R O WRITE/READ is asserted for read requests and deasserted for write requests. The

W/R

signal changes in the same clock cycle as ADS. It remains valid for the entire

S

access in non-pipelined regions. In pipelined regions, W/R

is not guaranteed to be

H(Z)

valid in the last cycle of a read access.

R(0)

ADS O ADDRESS STROBE indicates a valid address and the start of a new bus access.

ADS

is asserted for the first clock of a bus access.

S
H(Z)
R(1)

9

SPECIAL ENVIRONMENT 80960CA-25, -16

Table 3. 80960CA Pin DescriptionÐExternal Bus Signals (Continued)

Name Type Description

READY I READY is an input which signals the termination of a data transfer. READY is

used to indicate that read data on the bus is valid or that a write-data transfer

S(L)

has completed. The READY

signal works in conjunction with the internally

H(Z)

programmed wait-state generator. If READY

is enabled in a region, the pin is

R(Z)

sampled after the programmed number of wait-states has expired. If the
READY

pin is deasserted, wait states continue to be inserted until READY

becomes asserted. This is true for the N

RAD,NRDD,NWAD

and N

WDD

wait

states. The N

XDA

wait states cannot be extended.

BTERM I BURST TERMINATE is an input which breaks up a burst access and causes

another address cycle to occur. The BTERM

signal works in conjunction with

S(L)

the internally programmed wait-state generator. If READY

and BTERM are

H(Z)

enabled in a region, the BTERM

pin is sampled after the programmed number

R(Z)

of wait states has expired. When BTERM

is asserted, a new ADS signal is
generated and the access is completed. The READY input is ignored when
BTERM

is asserted. BTERM must be externally synchronized to satisfy

BTERM

setup and hold times.

WAIT O WAIT indicates internal wait state generator status. WAIT is asserted when

wait states are being caused by the internal wait state generator and not by

S

the READY

or BTERM inputs. WAIT can be used to derive a write-data

H(Z)

strobe. WAIT

can also be thought of as a READY output that the processor

R(1)

provides when it is inserting wait states.

BLAST O BURST LAST indicates the last transfer in a bus access. BLAST is asserted

in the last data transfer of burst and non-burst accesses after the wait state

S

counter reaches zero. BLAST

remains asserted until the clock following the

H(Z)

last cycle of the last data transfer of a bus access. If the READY

or BTERM

R(0)

input is used to extend wait states, the BLAST

signal remains asserted until

READY

or BTERM terminates the access.

DT/R O DATA TRANSMIT/RECEIVE indicates direction for data transceivers. DT/R

is used in conjunction with DEN to provide control for data transceivers

S

attached to the external bus. When DT/R

is asserted, the signal indicates that

H(Z)

the processor receives data. Conversely, when deasserted, the processor

R(0)

sends data. DT/R

changes only while DEN is high.

DEN O DATA ENABLE indicates data cycles in a bus request. DEN is asserted at the

start of the bus request first data cycle and is deasserted at the end of the last

S

data cycle. DEN

is used in conjunction with DT/R to provide control for data

H(Z)

transceivers attached to the external bus. DEN remains asserted for

R(1)

sequential reads from pipelined memory regions. DEN

is deasserted when

DT/R

changes.

LOCK O BUS LOCK indicates that an atomic read-modify-write operation is in

progress. LOCK

may be used to prevent external agents from accessing

S

memory which is currently involved in an atomic operation. LOCK

is asserted

H(Z)

in the first clock of an atomic operation and deasserted in the clock cycle

R(1)

following the last bus access for the atomic operation. To allow the most
flexibility for memory system enforcement of locked accesses, the processor
acknowledges a bus hold request when LOCK

is asserted. The processor

performs DMA transfers while LOCK

is active.

HOLD I HOLD REQUEST signals that an external agent requests access to the

external bus. The processor asserts HOLDA after completing the current bus

S(L)

request. HOLD, HOLDA and BREQ are used together to arbitrate access to

H(Z)

the processor’s external bus by external bus agents.

R(Z)

10

SPECIAL ENVIRONMENT 80960CA-25, -16

Table 3. 80960CA Pin DescriptionÐExternal Bus Signals (Continued)

Name Type Description

BOFF I BUS BACKOFF, when asserted, suspends the current access and causes

the bus pins to float. When BOFF

is deasserted, the ADS signal is asserted

S(L)

on the next clock cycle and the access is resumed.

H(Z)
R(Z)

HOLDA O HOLD ACKNOWLEDGE indicates to a bus requestor that the processor has

relinquished control of the external bus. When HOLDA is asserted, the

S

external address bus, data bus and bus control signals are floated. HOLD,

H(1)

BOFF

, HOLDA and BREQ are used together to arbitrate access to the

R(Q)

processor’s external bus by external bus agents. Since the processor grants
HOLD requests and enters the Hold Acknowledge state even while RESET

is

asserted, the state of the HOLDA pin is independent of the RESET

pin.

BREQ O BUS REQUEST is asserted when the bus controller has a request pending.

BREQ can be used by external bus arbitration logic in conjunction with HOLD

S

and HOLDA to determine when to return mastership of the external bus to the

H(Q)

processor.

R(0)

D/C O DATA OR CODE is asserted for a data request and deasserted for instruction

requests. D/C

has the same timing as W/R.

S
H(Z)
R(Z)

DMA O DMA ACCESS indicates whether the bus request was initiated by the DMA

controller. DMA

is asserted for any DMA request. DMA is deasserted for all

S

other requests.

H(Z)
R(Z)

SUP O SUPERVISOR ACCESS indicates whether the bus request is issued while in

supervisor mode. SUP

is asserted when the request has supervisor privileges

S

and is deasserted otherwise. SUP can be used to isolate supervisor code and

H(Z)

data structures from non-supervisor requests.

R(Z)

11

SPECIAL ENVIRONMENT 80960CA-25, -16

Table 4. 80960CA Pin DescriptionÐProcessor Control Signals

Name Type Description

RESET I RESET causes the chip to reset. When RESET is asserted, all external signals return to

the reset state. When RESET

is deasserted, initialization begins. When the 2-x clock

A(L)

mode is selected, RESET

must remain asserted for 32 CLKIN cycles before being

H(Z)

deasserted to guarantee correct processor initialization. When the 1-x clock mode is

R(Z)

selected, RESET

must remain asserted for 10,000 CLKIN cycles before being deasserted
to guarantee correct processor initialization. The CLKMODE pin selects 1-x or 2-x input
clock division of the CLKIN pin.

The processor’s Hold Acknowledge bus state functions while the chip is reset. If the
processor’s bus is in the Hold Acknowledge state when RESET

is asserted, the processor
will internally reset, but maintains the Hold Acknowledge state on external pins until the
Hold request is removed. If a Hold request is made while the processor is in the reset
state, the processor bus will grant HOLDA and enter the Hold Acknowledge state.

FAIL O FAIL indicates failure of the processor’s self-test performed at initialization. When RESET

is deasserted and the processor begins initialization, the FAIL pin is asserted. An internal

S

self-test is performed as part of the initialization process. If this self-test passes, the FAIL

H(Q)

pin is deasserted; otherwise it remains asserted. The FAIL

pin is reasserted while the

R(0)

processor performs an external bus self-confidence test. If this self-test passes, the
processor deasserts the FAIL

pin and branches to the user’s initialization routine;

otherwise the FAIL

pin remains asserted. Internal self-test and the use of the FAIL pin can

be disabled with the STEST pin.

STEST I SELF TEST causes the processor’s internal self-test feature to be enabled or disabled at

initialization. STEST is read on the rising edge of RESET

. When asserted, the processor’s

S(L)

internal self-test and external bus confidence tests are performed during processor

H(Z)

initialization. When deasserted, only the bus confidence tests are performed during

R(Z)

initialization.

ONCE I ON CIRCUIT EMULATION, when asserted, causes all outputs to be floated. ONCE is

continuously sampled while RESET

is low and is latched on the rising edge of RESET.To

A(L)

place the processor in the ONCE state:

H(Z)

(1) assert RESET and ONCE (order does not matter)

R(Z)

(2) wait for at least 16 CLKIN periods in 2-x modeÐor 10,000 CLKIN periods in 1-x

modeÐafter V

CC

and CLKIN are within operating specifications
(3) deassert RESET
(4) wait at least 32 CLKIN periods

(The processor will now be latched in the ONCE

state as long as RESET is high.)

To exit the ONCE state. bring V

CC

and CLKIN to operating conditions, then assert RESET

and bring ONCE high prior to deasserting RESET.
CLKIN must operate within the specified operating conditions of the processor until Step 4

above has been completed. CLKIN may then be changed to DC to achieve the lowest
possible ONCE mode leakage current.

ONCE

can be used by emulator products or for board testers to effectively make an

installed processor transparent in the board.

12

SPECIAL ENVIRONMENT 80960CA-25, -16

Table 4. 80960CA Pin DescriptionÐProcessor Control Signals (Continued)

Name Type Description

CLKIN I CLOCK INPUT is an input for the external clock needed to run the processor. The

external clock is internally divided as prescribed by the CLKMODE pin to produce

A(E)

PCLK2:1.

H(Z)
R(Z)

CLKMODE I CLOCK MODE selects the division factor applied to the external clock input (CLKIN).

When CLKMODE is high, CLKIN is divided by one to create PCLK2:1 and the

A(L)

processor’s internal clock. When CLKMODE is low, CLKIN is divided by two to create

H(Z)

PCLK2:1 and the processor’s internal clock. CLKMODE should be tied high or low in a

R(Z)

system as the clock mode is not latched by the processor. If left unconnected, the
processor will internally pull the CLKMODE pin low, enabling the 2-x clock mode.

PCLK2:1 O PROCESSOR OUTPUT CLOCKS provide a timing reference for all processor inputs

and outputs. All input and output timings are specified in relation to PCLK2 and

S

PCLK1. PCLK2 and PCLK1 are identical signals. Two output pins are provided to allow

H(Q)

flexibility in the system’s allocation of capacitive loading on the clock. PCLK2:1 may

R(Q)

also be connected at the processor to form a single clock signal.

V

SS

Ð GROUND connections must be connected externally to a VSSboard plane.

V

CC

Ð POWER connections must be connected externally to a VCCboard pane.

V

CCPLL

Ð V

CCPLL

is a separate VCCsupply pin for the phase lock loop used in 1-x clock mode.

Connecting a simple lowpass filter to V

CCPLL

may help reduce clock jitter (TCP)in

noisy environments. Otherwise, V

CCPLL

should be connected to VCC. This pin is

implemented starting with the D-stepping. See Table 13 for die stepping information.

NC Ð NO CONNECT pins must not be connected in a system.

13

SPECIAL ENVIRONMENT 80960CA-25, -16

Table 5. 80960CA Pin DescriptionÐDMA and Interrupt Unit Control Signals

Name Type Description

DREQ3:0 I DMA REQUEST causes a DMA transfer to be requested. Each of the four

signals requests a transfer on a single channel. DREQ0

requests channel 0,

A(L)

DREQ1

requests channel 1, etc. When two or more channels are requested

H(Z)

simultaneously, the channel with the highest priority is serviced first. The

R(Z)

channel priority mode is programmable.

DACK3:0 O DMA ACKNOWLEDGE indicates that a DMA transfer is being executed.

Each of the four signals acknowledges a transfer for a single channel. DACK0

S

acknowledges channel 0, DACK1 acknowledges channel 1, etc. DACK3:0 are

H(1)

asserted when the requesting device of a DMA is accessed.

R(1)

EOP/TC3:0 I/O END OF PROCESS/TERMINAL COUNT can be programmed as either an

input (EOP3:0

) or as an output (TC3:0), but not both. Each pin is individually

A(L)

programmable. When programmed as an input, EOPx

causes the termination

H(Z/Q)

of a current DMA transfer for the channel corresponding to the EOPx pin.

R(Z)

EOP0

corresponds to channel 0, EOP1 corresponds to channel 1, etc. When

a channel is configured for source

and

destination chaining, the EOP pin for
that channel causes termination of only the current buffer transferred and
causes the next buffer to be transferred. EOP3:0

are asynchronous inputs.

When programmed as an output, the channel’s TCx

pin indicates that the

channel byte count has reached 0 and a DMA has terminated. TCx

is driven

with the same timing as DACKx

during the last DMA transfer for a buffer. If the
last bus request is executed as multiple bus accesses, TCx will stay asserted
for the entire bus request.

XINT7:0 I EXTERNAL INTERRUPT PINS cause interrupts to be requested. These pins

can be configured in three modes:

A(E/L)

Dedicated Mode: each pin is a dedicated external interrupt source.

H(Z)

Dedicated inputs can be individually programmed to

R(Z)

be level (low) or edge (falling) activated.

Expanded Mode: the eight pins act together as an 8-bit vectored

interrupt source. The interrupt pins in this mode are
level activated. Since the interrupt pins are active low,
the vector number requested is the one’s
complement of the positive logic value place on the
port. This eliminates glue logic to interface to
combinational priority encoders which output
negative logic.

Mixed Mode: XINT7:5 are dedicated sources and XINT4:0 act as

the five most significant bits of an expanded mode
vector. The least significant bits are set to 010
internally.

NMI I NON-MASKABLE INTERRUPT causes a non-maskable interrupt event to

occur. NMI

is the highest priority interrupt recognized. NMI is an edge (falling)

A(E)

activated source.

H(Z)
R(Z)

14

SPECIAL ENVIRONMENT 80960CA-25, -16

3.3 80960CA Mechanical Data

3.3.1 80960CA PGA Pinout

Tables 6 and 7 list the 80960CA pin names with
package location. Figure 2 depicts the complete
80960CA PGA pinout as viewed from the top side of

the component (i.e., pins facing down). Figure 3
shows the complete 80960CA PGA pinout as
viewed from the pin-side of the package (i.e., pins
facing up). See Section 4.0, ELECTRICAL SPECI-
FICATIONS for specifications and recommended
connections.

Table 6. 80960CA PGA PinoutÐIn Signal Order

Address Bus Data Bus Bus Control Processor Control I/O

Signal Pin Signal Pin Signal Pin Signal Pin Signal Pin

A31 S15 D31 R3 BE3 S5 RESET A16 DREQ3 A7

A30 Q13 D30 Q5 BE2 S6 DREQ2 B6

A29 R14 D29 S2 BE1 S7 FAIL A2 DREQ1 A6

A28 Q14 D28 Q4 BE0 R9 DREQ0 B5

A27 S16 D27 R2 STEST B2

A26 R15 D26 Q3 W/R S10 DACK3 A10

A25 S17 D25 S1 ONCE C3 DACK2 A9

A24 Q15 D24 R1 ADS R6 DACK1 A8

A23 R16 D23 Q2 CLKIN C13 DACK0 B8

A22 R17 D22 P3 READY S3 CLKMODE C14

A21 Q16 D21 Q1 BTERM R4 PLCK1 B14 EOP/TC3 A14

A20 P15 D20 P2 PLCK2 B13 EOP/TC2 A13

A19 P16 D19 P1 WAIT S12 EOP/TC1 A12

A18 Q17 D18 N2 BLAST S8 V

SS

EOP/TC0 A11

A17 P17 D17 N1

Location

A16 N16 D16 M1 DT/R S11

Q8, Q9, Q10, Q11

L15, M3, M15, Q7,

J15, K3, K15, L3,

G15, H3, H15, J3,

C11, C12, F15, G3,

C7, C8, C9, C10,

XINT7

C17

A15 N17 D15 L1 DEN S9 XINT6 C16

A14 M17 D14 L2 XINT5 B17

A13 L16 D13 K1 LOCK S14 XINT4 C15

A12 L17 D12 J1 XINT3 B16

A11 K17 D11 H1 V

CC

XINT2 A17

A10 J17 D10 H2 HOLD R5

Location

XINT1 A15

A9 H17 D9 G1 HOLDA S4

R8, R10, R11

N3, N15, Q6, R7,

K2, K16, M2, M16,

G2, H16, J2, J16,

C6, E15, F3, F16,

B7, B9, B11, B12,

XINT0

B15

A8 G17 D8 F1 BREQ R13

A7 G16 D7 E1 NMI D15

A6 F17 D6 F2 D/C S13

A5 E17 D5 D1 DMA R12

A4 E16 D4 E2 SUP Q12 V

CCPLL

B10

A3 D17 D3 C1 No Connect

A2 D16 D2 D2 BOFF B1

Location

D1 C2

B4, C4, C5, D3

A1, A3, A4, A5, B3,

D0 E3

15

SPECIAL ENVIRONMENT 80960CA-25, -16

Table 7. 80960CA PGA PinoutÐIn Pin Order

Pin Signal Pin Signal Pin Signal Pin Signal Pin Signal

A1 NC C1 D3 G1 D9 M1 D16 R1 D24

A2 FAIL C2 D1 G2 V

CC

M2 V

CC

R2 D27

A3 NC C3 ONCE G3 V

SS

M3 V

SS

R3 D31

A4 NC C4 NC G15 V

SS

M15 V

SS

R4 BTERM

A5 NC C5 NC G16 A7 M16 V

CC

R5 HOLD

A6 DREQ1 C6 V

CC

G17 A8 M17 A14 R6 ADS

A7 DREQ3 C7 V

SS

R7 V

CC

A8 DACK1 C8 V

SS

H1 D11 N1 D17 R8 V

CC

A9 DACK2 C9 V

SS

H2 D10 N2 D18 R9 BE0

A10 DACK3 C10 V

SS

H3 V

SS

N3 V

CC

R10 V

CC

A11 EOP/TC0 C11 V

SS

H15 V

SS

N15 V

CC

R11 V

CC

A12 EOP/TC1 C12 V

SS

H16 V

CC

N16 A16 R12 DMA

A13 EOP/TC2 C13 CLKIN H17 A9 N17 A15 R13 BREQ

A14 EOP/TC3 C14 CLKMODE R14 A29

A15 XINT1 C15 XINT4 J1 D12 P1 D19 R15 A26

A16 RESET C16 XINT6 J2 V

CC

P2 D20 R16 A23

A17 XINT2 C17 XINT7 J3 V

SS

P3 D22 R17 A22

J15 V

SS

P15 A20

B1 BOFF D1 D5 J16 V

CC

P16 A19 S1 D25

B2 STEST D2 D2 J17 A10 P17 A17 S2 D29

B3 NC D3 NC S3 READY

B4 NC D15 NMI K1 D13 Q1 D21 S4 HOLDA

B5 DREQ0 D16 A2 K2 V

CC

Q2 D23 S5 BE3

B6 DREQ2 D17 A3 K3 V

SS

Q3 D26 56 BE2

B7 V

CC

K15 V

SS

Q4 Q28 S7 BE1

B8 DACK0 E1 D7 K16 V

CC

Q5 D30 S8 BLAST

B9 V

CC

E2 D4 K17 A11 Q6 V

CC

S9 DEN

B10 V

CCPLL

E3 D0 Q7 V

SS

S10 W/R

B11 V

CC

E15 V

CC

L1 D15 Q8 V

SS

S11 DT/R

B12 V

CC

E16 A4 L2 D14 Q9 V

SS

S12 WAIT

B13 PCLK2 E17 A5 L3 V

SS

Q10 V

SS

S13 D/C

B14 PCLK1 L15 V

SS

Q11 V

SS

S14 LOCK

B15 XINT0 F1 D8 L16 A13 Q12 SUP S15 A31

B16 XINT3 F2 D6 L17 A12 Q13 A30 S16 A27

B17 XINT5 F3 V

CC

Q14 A28 S17 A25

F15 V

SS

Q15 A24

F16 V

CC

Q16 A21

F17 A6 Q17 A18

16

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–2

Figure 2. 80960CA PGA PinoutÐView from Top (Pins Facing Down)

17

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–3

Figure 3. 80960CA PGA PinoutÐView from Bottom (Pins Facing Up)

18

SPECIAL ENVIRONMENT 80960CA-25, -16

3.4 Package Thermal Specifications

The 80960CA is specified for operation when T

C

(case temperature) is within the range ofb40§C–

a

110§C. TCmay be measured in any environment
to determine whether the 80960CA is within speci­fied operating range. Case temperature should be
measured at the center of the top surface, opposite
the pins. Refer to Figure 4.

T

A

(ambient temperature) can be calculated from

i

CA

(thermal resistance from case to ambient) using

the following equation:

T

A

e

T

C

b

P*i

CA

Table 8 shows the maximum TAallowable (without
exceeding T

C

) at various airflows and operating fre-

quencies (f

PCLK

).

Note that T

A

is greatly improved by attaching fins or
a heatsink to the package. P (maximum power con­sumption) is calculated by using the typical I

CC

as
tabulated in Section 4.4, DC Specifications and
V

CC

of 5V.

271327–4

Figure 4. Measuring 80960CA PGA Case Temperature

Table 8. Maximum T

A

at Various Airflows in§C

Airflow-ft/min (m/sec)

f

PCLK

0 200 400 600 800 1000

(MHz) (0) (1.01) (2.03) (3.04) (4.06) (5.07)

TAwith 33 51 66 79 81 85 87
Heatsink* 25 61 73 83 85 88 89

16 74 82 89 90 92 93

TAwithout 33 36 47 59 66 73 75
Heatsink* 25 49 58 67 73 78 80

16 66 72 78 82 86 87

NOTES:

0.285

×

high undirectional heatsink (Al alloy 6061, 50 mil fin width, 150 mil center-to-center fin spacing).

19

SPECIAL ENVIRONMENT 80960CA-25, -16

Table 9. 80960CA PGA Package Thermal Characteristics

Thermal ResistanceЧC/Watt

Parameter

AirflowÐft/min (m/sec)

0 200 400 600 800 1000

(0) (1.01) (2.03) (3.07) (4.06) (5.07)

i Junction-to-Case
(Case measured as 1.5 1.5 1.5 1.5 1.5 1.5
shown in Figure 4)

i Case-to-Ambient

17 14 11 9 7.1 6.6

(No Heatsink)

i Case-to-Ambient

13 9 5.5 5 3.9 3.4

(With Heatsink)*

NOTES:

1. This table applies to 80960CA PGA plugged into socket or soldered directly to board.

2. i

JA

e

i

JC

a

iCA.

*0.285

×

high unidirectional heatsink (Al alloy 6061, 50 mil fin width, 150 mil center-to-center fin spacing).

20

SPECIAL ENVIRONMENT 80960CA-25, -16

3.5 Stepping Register Information

Upon reset, register g0 contains die stepping infor­mation. Figure 5 shows how g0 is configured. The
most significant byte contains an ASCII 0. The upper
middle byte contains an ASCII C. The lower middle
byte contains an ASCII A. The least significant byte
contains the stepping number in ASCII. g0 retains
this information until it is overwritten by the user pro­gram.

ASCII 00 43 41 Stepping Number

DECIMAL 0 C A Stepping Number

MSB LSB

Figure 5. Register g0

Table 10 contains a cross reference of the number
in the least significant byte of register g0 to the die
stepping number.

Table 10. Die Stepping Cross Reference

g0 Least Significant

Die Stepping

Byte

01 B

02 C-1

03 C-2,C-3

04 D

3.6 Suggested Sources for 80960CA

Accessories

The following is a list of suggested sources for
80960CA accessories. This is not an endorsement
of any kind, nor is it a warranty of the performance of
any of the listed products and/or companies.

Sockets

1. 3M Textool Test and Interconnection
Products Department
P.O. Box 2963
Austin, TX 78769-2963

2. Augat, Inc.
Interconnection Products Group
33 Perry Avenue
P.O. Box 779
Attleboro, MA 02703
[phone]

3. Concept Manufacturing, Inc.
(Decoupling Sockets)
41484 Christy Street
Fremont, CA 94538
[phone]

Heatsinks/Fins

1. Thermalloy, Inc.
2021 West Valley View Lane
Dallas, TX 75234-8993
[phone]
FAX: [phone]

2. E G & G Division
60 Audubon Road
Wakefield, MA 01880
[phone]

21

SPECIAL ENVIRONMENT 80960CA-25, -16

4.0 ELECTRICAL SPECIFICATIONS

4.1 Absolute Maximum Ratings

Storage Temperature ААААААААААb65§Ctoa150§C

Case Temperature Under BiasÀÀÀb40§Ctoa110§C

Supply Voltage

with Respect to V

SS

АААААААААААb0.5V toa6.5V

Voltage on Other Pins

with Respect to V

SS

ААААААb0.5V to V

CC

a

0.5V

NOTICE: This is a production data sheet. The specifi­cations are subject to change without notice.

*

WARNING: Stressing the device beyond the ‘‘Absolute
Maximum Ratings’’ may cause permanent damage.
These are stress ratings only. Operation beyond the
‘‘Operating Conditions’’ is not recommended and ex­tended exposure beyond the ‘‘Operating Conditions’’
may affect device reliability.

4.2 Operating Conditions

Table 11. Operating Conditons (80960CA-25, -16)

Symbol Parameter Min Max Units Notes

V

CC

Supply Voltage 80960CA-25 4.50 5.50 V

80960CA-16 4.50 5.50 V

f

CLK2x

Input Clock Frequency (2-x Mode) 80960CA-25 0 50 MHz

80960CA-16 0 32 MHz

f

CLK1x

Input Clock Frequency (1-x Mode) 80960CA-25 8 25 MHz (Note 1)

80960CA-16 8 16 MHz

T

C

Case Temperature Under Bias PGA package

b

40

a

110

§

C

80960CA-25, -16

NOTES:

1. When in the 1-x input clock mode, CLKIN is an input to an internal phase-locked loop and must maintain a minimum
frequency of 8 MHz for proper processor operation. However, in the 1-x mode, CLKIN may still be stopped when the
processor either is in a reset condition or is reset. If CLKIN is stopped, the specified RESET low time must be provided once
CLKIN restarts and has stabilized.

2. Case temperatures are ‘‘instant on’’.

4.3 Recommended Connections

Power and ground connections must be made to
multiple V

CC

and VSS(GND) pins. Every 80960CA-

based circuit board should include power (V

CC

) and

ground (V

SS

) planes for power distribution. Every

V

CC

pin must be connected to the power plane, and

every V

SS

pin must be connected to the ground
plane. Pins identified as ‘‘NC’’ must not be connect­ed in the system.

Liberal decoupling capacitance should be placed
near the 80960CA. The processor can cause tran­sient power surges when its numerous output buff­ers transition, particularly when connected to large
capacitive loads.

Low inductance capacitors and interconnects are
recommended for best high frequency electrical per­formance. Inductance can be reduced by shortening
the board traces between the processor and decou­pling capacitors as much as possible. Capacitors
specifically designed for PGA packages will offer the
lowest possible inductance.

For reliable operation, always connect unused in­puts to an appropriate signal level. In particular, any
unused interrupt (XINT

, NMI) or DMA (DREQ) input

should be connected to V

CC

through a pull-up resis-

tor, as should BTERM

if not used. Pull-up resistors
should be in the in the range of 20 KX for each pin
tied high. If READY

or HOLD are not used, the un­used input should be connected to ground. N.C.
pins must always remain unconnected. Refer to
the

i960ÉCA Microprocessor User’s Manual

(Order

Number 270710) for more information.

22

SPECIAL ENVIRONMENT 80960CA-25, -16

4.4 DC Specifications

Table 12. DC Characteristics

(80960CA-25, -16 under the conditions described in Section 4.2, Operating Conditions.)

Symbol Parameter Min Max Units Notes

V

IL

Input Low Voltage for all pins except RESET

b

0.3

a

0.8 V

V

IH

Input High Voltage for all pins except RESET 2.0 V

CC

a

0.3 V

V

OL

Output Low Voltage 0.45 V I

OL

e

5mA

V

OH

Output High Voltage I

OH

eb

1 mA 2.4 V

I

OH

eb

200 mAV

CC

b

0.5 V

V

ILR

Input Low Voltage for RESET

b

0.3 1.5 V

V

IHR

Input High Voltage for RESET 3.5 V

CC

a

0.3 V

I

LI1

Input Leakage Current for each pin

except

:

BTERM

, ONCE, DREQ3:0, STEST,

EOP3:0

/TC3:0, NMI, XINT7:0, BOFF, READY,

HOLD, CLKMODE

g

15 mA0sV

IN

s

V

CC

(1)

I

LI2

Input Leakage Current for:
BTERM

, ONCE, DREQ3:0, STEST,

EOP3:0

/TC3:0, NMI, XINT7:0, BOFF 0

b

325 mAV

IN

e

0.45V

(2)

I

LI3

Input Leakage Current for:
READY

, HOLD, CLKMODE 0 500 mAV

IN

e

2.4V

(3,7)

I

LO

Output Leakage Current

g

15 mA 0.45sV

OUT

s

V

CC

I

CC

Supply Current (80960CA-25):

I

CC

Max 750 mA (Note 4)

I

CC

Typ 600 mA (Note 5)

I

CC

Supply Current (80960CA-16):

I

CC

Max 550 mA (Note 4)

ICCTyp 400 mA (Note 5)

I

ONCE

ONCE-mode Supply Current 100 mA

C

IN

Input Capacitance for:
CLKIN, RESET

, ONCE,

READY

, HOLD, DREQ3:0, BOFF,

XINT7:0

, NMI, BTERM, CLKMODE 0 12 pF F

C

e

1 MHz

C

OUT

Output Capacitance of each output pin 12 pF F

C

e

1 MHz

(6)

C

I/O

I/O Pin Capacitance 12 pF F

C

e

1 MHz

NOTES:

1. No pullup or pulldown.

2. These pins have internal pullup resistors.

3. These pins have internal pulldown resistors.

4. Measured at worst case frequency, V

CC

and temperature, with device operating and outputs loaded to the test conditions

described in Section 4.5.1, AC Test Conditions.

5. I

CC

Typical is not tested.

6. Output Capacitance is the capacitive load of a floating output.

7. CLKMODE pin has a pulldown resistor only when ONCE

pin is deasserted.

23

SPECIAL ENVIRONMENT 80960CA-25, -16

4.5 AC Specifications

Table 13. 80960CA AC Characteristics (25 MHz)

(80960CA-25 only, under conditions described in Section 4.2, Operating Conditions and Section 4.5.1,
AC Test Conditions.)

Symbol Parameter Min Max Units Notes

Input Clock (1, 9)

T

F

CLKIN Frequency 0 50 MHz

T

C

CLKIN Period In 1-x Mode (f

CLK1x

) 40 125 ns (11)

In 2-x Mode (f

CLK2x

)20

%

ns

T

CS

CLKIN Period Stability In 1-x Mode (f

CLK1x

)

g

0.1% D (12)

T

CH

CLKIN High Time In 1-x Mode (f

CLK1x

) 8 62.5 ns (11)

In 2-x Mode (f

CLK2x

)8

%

ns

T

CL

CLKIN Low Time In 1-x Mode (f

CLK1x

) 8 62.5 ns (11)

In 2-x Mode (f

CLK2x

)8

%

ns

T

CR

CLKIN Rise Time 0 6 ns

T

CF

CLKIN Fall Time 0 6 ns

Output Clocks (1, 8)

T

CP

CLKIN to PCLK2:1 Delay In 1-x Mode (f

CLK1x

)

b

2 2 ns (3, 12)

In 2-x Mode (f

CLK2x

) 2 25 ns (3)

T PCLK2:1 Period In 1-x Mode (f

CLK1x

)T

C

ns (12)

In 2-x Mode (f

CLK2x

)2T

C

ns (3)

T

PH

PCLK2:1 High Time (T/2)b3 T/2 ns (12)

T

PL

PCLK2:1 Low Time (T/2)b3 T/2 ns (12)

T

PR

PCLK2:1 Rise Time 1 4 ns (3)

T

PF

PCLK2:1 Fall Time 1 4 ns (3)

Synchronous Outputs (8)

T

OH

Output Valid Delay, Output Hold (6, 10)

T

OV

T

OH1,TOV1

A31:2 3 16 ns

T

OH2,TOV2

BE3:0 318ns

T

OH3,TOV3

ADS 620ns

T

OH4,TOV4

W/R 320ns

T

OH5,TOV5

D/C, SUP, DMA 418ns

T

OH6,TOV6

BLAST, WAIT 518ns

T

OH7,TOV7

DEN 318ns

T

OH8,TOV8

HOLDA, BREQ 4 18 ns

T

OH9,TOV9

LOCK 418ns

T

OH10,TOV10

DACK3:0 420ns

T

OH11,TOV11

D31:0 3 18 ns

T

OH12,TOV12

DT/R T/2a3 T/2a16 ns

T

OH13,TOV13

FAIL 216ns

T

OH14,TOV14

EOP3:0/TC3:0 3 20 ns (6, 10)

T

OF

Output Float for all ouputs 3 22 ns (6)

Synchronous Inputs (1, 9, 10)

T

IS

Input Setup
T

IS1

D31:0 5 ns

T

IS2

BOFF 19 ns

T

IS3

BTERM/READY 9ns

T

IS4

HOLD 9 ns

T

IH

Input Hold
T

IH1

D31:0 5 ns

T

IH2

BOFF 7ns

T

IH3

BTERM/READY 2ns

T

IH4

HOLD 5 ns

24

SPECIAL ENVIRONMENT 80960CA-25, -16

Table 13. 80960CA AC Characteristics (25 MHz) (Continued)

(80960CA-25 only, under conditions described in Section 4.2, Operating Conditions and Section 4.5.1,
AC Test Conditions.)

Symbol Parameter Min Max Units Notes

Relative Output Timings (1, 2, 3, 8)

T

AVSH1

A31:2 Valid to ADS Rising Tb4T

a

4ns

T

AVSH2

BE3:0, W/R, SUP, D/C,
DMA

, DACK3:0 Valid to ADS Rising Tb6T

a

6ns

T

AVEL1

A31:2 Valid to DEN Falling Tb4T

a

4ns

T

AVEL2

BE3:0, W/R, SUP, INST,
DMA

, DACK3:0 Valid to DEN Falling Tb6T

a

6ns

T

NLQV

WAIT Falling to Output Data Valid

g

4ns

T

DVNH

Output Data Valid to WAIT Rising N*Tb4N*T

a

4 ns (4)

T

NLNH

WAIT Falling to WAIT Rising N*Tg4 ns (4)

T

NHQX

Output Data Hold after WAIT Rising (Na1)*Tb8(N

a

1)* Ta6 ns (5)

T

EHTV

DT/R Hold after DEN High T/2b7

%

ns (6)

T

TVEL

DT/R Valid to DEN Falling T/2b4ns

Relative Input Timings (1, 2, 3)

T

IS5

RESET Input Setup (2-x Clock Mode) 8 ns (13)

T

IH5

RESET Input Hold (2-x Clock Mode) 7 ns (13)

T

IS6

DREQ3:0 Input Setup 14 ns (7)

T

IH6

DREQ3:0 Input Hold 9 ns (7)

T

IS7

XINT7:0, NMI Input Setup 10 ns (15)

T

IH7

XINT7:0, NMI Input Hold 10 ns (15)

T

IS8

RESET Input Setup (1-x Clock Mode) 3 ns (14)

T

IH8

RESET Input Hold (1-x Clock Mode) T/4a1 ns (14)

NOTES:

1. See Section 4.5.2, AC Timing Waveforms for waveforms and definitions.

2. See Figure 16 for capacitive derating information for output delays and hold times.

3. See Figure 17 for capacitive derating information for rise and fall times.

4. Where N is the number of N

RAD,NRDD,NWAD

or N

WDD

wait states that are programmed in the Bus Controller Region

Table. WAIT

never goes active when there are no wait states in an access.

5. N

e

Number of wait states inserted with READY.

6. Output Data and/or DT/R

may be driven indefinitely following a cycle if there is no subsequent bus activity.

7. Since asynchronous inputs are synchronized internally by the 80960CA, they have no required setup or hold times to be
recognized and for proper operation. However, to guarantee recognition of the input at a particular edge of PCLK2:1,
the setup times shown must be met. Asynchronous inputs must be active for at least two consecutive PCLK2:1 rising
edges to be seen by the processor.

8. These specifications are guaranteed by the processor.

9. These specifications must be met by the system for proper operation of the processor.

10. This timing is dependent upon the loading of PCLK2:1. Use the derating curves of Section 4.5.3, Derating Curves to
adjust the timing for PCLK2:1 loading.

11. In the 1-x input clock mode, the maximum input clock period is limited to 125 ns while the processor is operating. When
the processor is in reset, the input clock may stop even in 1-x mode.

12. When in the 1-x input clock mode, these specifications assume a stable input clock with a period variation of less than

g

0.1% between adjacent cycles.

13. In 2-x clock mode, RESET

is an asynchronous input which has no required setup and hold time for proper operation.

However, to guarantee the device exits reset synchronized to a particular clock edge, the RESET

pin must meet setup

and hold times to the falling edge of the CLKIN. (See Figure 21).

14. In 1-x clock mode, RESET

is an asynchronous input which has no required setup and hold time for proper operation.

However, to guarantee the device exits reset synchronized to a particular clock edge, the RESET

pin must meet setup

and hold times to the rising edge of the CLKIN. (See Figure 22.)

15. The interrupt pins are synchronized internally by the 80960CA. They have no required setup or hold times for proper
operation. These pins are sampled by the interrupt controller every other clock and must be active for at least three
consecutive PCLK2:1 rising edges when asserting them asynchronously. To guarantee recognition at a particular clock
edge, the setup and hold times shown must be met for two consecutive PCLK2:1 rising edges.

25

SPECIAL ENVIRONMENT 80960CA-25, -16

Table 14. 80960CA AC Characteristics (16 MHz)

(80960CA-16 only, under conditions described in Section 4.2, Operating Conditions and Section 4.5.1,
AC Test Conditions.)

Symbol Parameter Min Max Units Notes

Input Clock (1, 9)

T

F

CLKIN Frequency 0 32 MHz

T

C

CLKIN Period In 1-x Mode (f

CLK1x

) 62.5 125 ns (11)

In 2-x Mode (f

CLK2x

) 31.25

%

ns

T

CS

CLKIN Period Stability In 1-x Mode (f

CLK1x

)

g

0.1% D (12)

T

CH

CLKIN High Time In 1-x Mode (f

CLK1x

) 10 62.5 ns (11)

In 2-x Mode (f

CLK2x

)10

%

ns

T

CL

CLKIN Low Time In 1-x Mode (f

CLK1x

) 10 62.5 ns (11)

In 2-x Mode (f

CLK2x

)10

%

ns

T

CR

CLKIN Rise Time 0 6 ns

T

CF

CLKIN Fall Time 0 6 ns

Output Clocks (1, 8)

T

CP

CLKIN to PCLK2:1 Delay In 1-x Mode (f

CLK1x

)

b

2 2 ns (3, 12)

In 2-x Mode (f

CLK2x

) 2 25 ns (3)

T PCLK2:1 Period In 1-x Mode (f

CLK1x

)T

C

ns (12)

In 2-x Mode (f

CLK2x

)2T

C

ns (3)

T

PH

PCLK2:1 High Time (T/2)b4 T/2 ns (12)

T

PL

PCLK2:1 Low Time (T/2)b4 T/2 ns (12)

T

PR

PCLK2:1 Rise Time 1 4 ns (3)

T

PF

PCLK2:1 Fall Time 1 4 ns (3)

Synchronous Outputs (8)

T

OH

Output Valid Delay, Output Hold (6, 10)

T

OV

T

OH1,TOV1

A31:2 3 18 ns

T

OH2,TOV2

BE3:0 320ns

T

OH3,TOV3

ADS 622ns

T

OH4,TOV4

W/R 322ns

T

OH5,TOV5

D/C, SUP, DMA 420ns

T

OH6,TOV6

BLAST, WAIT 520ns

T

OH7,TOV7

DEN 320ns

T

OH8

,T

OV8

HOLDA, BREQ 4 20 ns

T

OH9,TOV9

LOCK 420ns

T

OH10,TOV10

DACK3:0 422ns

T

OH11,TOV11

D31:0 3 20 ns

T

OH12,TOV12

DT/R T/2a3 T/2a18 ns

T

OH13,TOV13

FAIL 218ns

T

OH14,TOV14

EOP3:0/TC3:0 3 22 ns (6, 10)

T

OF

Output Float for All Ouputs 3 22 ns (6)

Synchronous Inputs (1, 9, 10)

T

IS

Input Setup
T

IS1

D31:0 5 ns

T

IS2

BOFF 21 ns

T

IS3

BTERM/READY 9ns

T

IS4

HOLD 9 ns

T

IH

Input Hold
T

IH1

D31:0 5 ns

T

IH2

BOFF 7ns

T

IH3

BTERM/READY 2ns

T

IH4

HOLD 5 ns

26

SPECIAL ENVIRONMENT 80960CA-25, -16

Table 14. 80960CA AC Characteristics (16 MHz) (Continued)

(80960CA-16 only, under conditions described in Section 4.2, Operating Conditions and Section 4.5.1,
AC Test Conditions.)

Symbol Parameter Min Max Units Notes

Relative Output Timings (1, 2, 3, 8)

T

AVSH1

A31:2 Valid to ADS Rising Tb4T

a

4ns

T

AVSH2

BE3:0, W/R, SUP, D/C,
DMA

, DACK3:0 Valid to ADS Rising Tb6T

a

6ns

T

AVEL1

A31:2 Valid to DEN Falling Tb6T

a

6ns

T

AVEL2

BE3:0, W/R, SUP, INST,
DMA

, DACK3:0 Valid to DEN Falling Tb6T

a

6ns

T

NLQV

WAIT

Falling to Output Data Valid

g

4ns

T

DVNH

Output Data Valid to WAIT Rising N*Tb4N*T

a

4 ns (4)

T

NLNH

WAIT Falling to WAIT Rising N*Tg4 ns (4)

T

NHQX

Output Data Hold after WAIT Rising (Na1)*Tb8(N

a

1)* Ta4 ns (5)

T

EHTV

DT/R Hold after DEN High T/2b7

%

ns (6)

T

TVEL

DT/R Valid to DEN Falling T/2b4ns

Relative Input Timings (1, 2, 3)

T

IS5

RESET Input Setup (2-x Clock Mode) 10 ns (13)

T

IH5

RESET Input Hold (2-x Clock Mode) 9 ns (13)

T

IS6

DREQ3:0 Input Setup 16 ns (7)

T

IH6

DREQ3:0 Input Hold 11 ns (7)

T

IS7

XINT7:0 NMI Input Setup 10 ns (15)

T

IH7

XINT7:0 NMI Input Hold 10 ns (15)

T

IS8

RESET Input Setup (1-x Clock Mode) 3 ns (14)

T

IH8

RESET Input Hold (1-x Clock Mode) T/4a1 ns (14)

NOTES:

1. See Section 4.5.2, AC Timing Waveforms for waveforms and definitions.

2. See Figure 16 for capacitive derating information for output delays and hold times.

3. See Figure 17 for capacitive derating information for rise and fall times.

4. Where N is the number of N

RAD,NRDD,NWAD

or N

WDD

wait states that are programmed in the Bus Controller Region

Table. WAIT

never goes active when there are no wait states in an access.

5. N

e

Number of wait states inserted with READY.

6. Output Data and/or DT/R

may be driven indefinitely following a cycle if there is no subsequent bus activity.

7. Since asynchronous inputs are synchronized internally by the 80960CA, they have no required setup or hold times to be
recognized and for proper operation. However, to guarantee recognition of the input at a particular edge of PCLK2:1,
the setup times shown must be met. Asynchronous inputs must be active for at least two consecutive PCLK2:1 rising
edges to be seen by the processor.

8. These specifications are guaranteed by the processor.

9. These specifications must be met by the system for proper operation of the processor.

10. This timing is dependent upon the loading of PCLK2:1. Use the derating curves of Section 4.5.3, Derating Curves to
adjust the timing for PCLK2:1 loading.

11. In the 1-x input clock mode, the maximum input clock period is limited to 125 ns while the processor is operating. When
the processor is in reset, the input clock may stop even in 1-x mode.

12. When in the 1-x input clock mode, these specifications assume a stable input clock with a period variation of less than

g

0.1% between adjacent cycles.

13. In 2-x clock mode, RESET

is an asynchronous input which has no required setup and hold time for proper operation.

However, to guarantee the device exits reset synchronized to a particular clock edge, the RESET

pin must meet setup

and hold times to the falling edge of the CLKIN. (See Figure 21).

14. In 1-x clock mode, RESET

is an asynchronous input which has no required setup and hold time for proper operation.

However, to guarantee the device exits reset synchronized to a particular clock edge, the RESET

pin must meet setup

and hold times to the rising edge of the CLKIN. (See Figure 22.)

15. The interrupt pins are synchronized internally by the 80960CA. They have no required setup or hold times for proper
operation. These pins are sampled by the interrupt controller every other clock and must be active for at least three
consecutive PCLK2:1 rising edges when asserting them asynchronously. To guarantee recognition at a particular clock
edge, the setup and hold times shown must be met for two consecutive PCLK2:1 rising edges.

27

SPECIAL ENVIRONMENT 80960CA-25, -16

4.5.1 AC Test Conditions

The AC Specifications in Section 4.5 are tested with
the 50 pF load shown in Figure 6. Figure 15 shows
how timings vary with load capacitance.

Specifications are measured at the 1.5V crossing
point, unless otherwise indicated. Input waveforms
are assumed to have a rise and fall time of

s

2ns
from 0.8V to 2.0V. See Section 4.5.2, AC Timing
Waveforms for AC spec definitions, test points and
illustrations.

271327–6

C

L

e

50 pF for all signals.

Figure 6. AC Test Load

4.5.2 AC Timing Waveforms

271327–7

Figure 7. Input and Output Clock Waveforms

271327–8

Figure 8. CLKIN Waveform

28

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–9

Figure 9. Output Delay and Float Waveform

271327–10

Figure 10. Input Setup and Hold Waveform

T

OVTOH

OUTPUT DELAYÐThe maximum output delay is referred to as the Output Valid Delay (TOV). The
minimum output delay is referred to as the Output Hold (T

OH

).

T

OF

OUTPUT FLOAT DELAYÐThe output float condition occurs when the maximum output current
becomes less than I

LO

in magnitude.

TIST

IH

INPUT SETUP AND HOLDÐThe input setup and hold requirements specify the sampling window
during which synchronous inputs must be stable for correct processor operation.

29

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–11

Figure 11. NMI, XINT7:0 Input Setup and Hold Waveform

271327–12

Figure 12. Hold Acknowledge Timings

T

OVTOH

OUTPUT DELAYÐThe maximum output delay is referred to as the Output Valid Delay (TOV). The
minimum output delay is referred to as the Output Hold (T

OH

).

T

OF

OUTPUT FLOAT DELAYÐThe output float condition occurs when the maximum output current
becomes less than I

LO

in magnitude.

TIST

IH

INPUT SETUP AND HOLDÐThe input setup and hold requirements specify the sampling window
during which synchronous inputs must be stable for correct processor operation.

30

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–13

Figure 13. Bus Backoff BOFF Timings

31

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–14

Figure 14. Relative Timings Waveforms

4.5.3 Derating Curves

271327–15

NOTE:

PCLK Load

e

50 pF

Figure 15. Output Delay or Hold vs Load Capacitance

32

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–16

a) All outputs except: LOCK, DMA, SUP, HOLDA,
BREQ, DACK3:0

, EOP3:0

/TC3:0, FAIL

b) LOCK, DMA, SUP, HOLDA, BREQ, DACK3:0,
EOP3:0

/TC3:0

, FAIL

Figure 16. Rise and Fall Time Derating at Highest Operating Temperature and Minimum V

CC

271327–17

ICC–ICCunder test conditions

Figure 17. ICCvs Frequency and Temperature

33

SPECIAL ENVIRONMENT 80960CA-25, -16

5.0 RESET, BACKOFF AND HOLD

ACKNOWLEDGE

Table 15 lists the condition of each processor output
pin while RESET

is asserted (low).

Table 15. Reset Conditions

Pins

State During Reset

(HOLDA Inactive)

1

A31:2 Floating

D31:0 Floating

BE3:0 Driven high (Inactive)

W/R Driven low (Read)

ADS Driven high (Inactive)

WAIT Driven high (Inactive)

BLAST Driven low (Active)

DT/R Driven low (Receive)

DEN Driven high (Inactive)

LOCK Driven high (inactive)

BREQ Driven low (Inactive)

D/C Floating

DMA Floating

SUP Floating

FAIL Driven low (Active)

DACK3:0 Driven high (Inactive)

EOP3:0/TC3:0 Floating (Set to input mode)

NOTES:

1. With regard to bus output pin state only, the Hold Ac-

knowledge state takes precedence over the reset state.
Although asserting the RESET

pin will internally reset
the processor, the processor’s bus output pins will not
enter the reset state if it has granted Hold Acknowledge
to a previous HOLD request (HOLDA is active). Further­more, the processor will grant new HOLD requests and
enter the Hold Acknowledge state even while in reset.

For example, if HOLDA is inactive and the processor is
in the reset state, then HOLD is asserted, the process­sor’s bus pins enter the Hold Acknowledge state and
HOLDA is granted. The processor will not be able to
perform memory accesses until the HOLD request is re­moved, even if the RESET

pin is brought high. This op­eration is provided to simplify boot-up synchronization
among multiple processors sharing the same bus.

Table 16 lists the condition of each processor output
pin while HOLDA is asserted (low).

Table 16. Hold Acknowledge and Backoff

Conditions

Pins State During HOLDA

A31:2 Floating

D31:0 Floating

BE3:0 Floating

W/R Floating

ADS Floating

WAIT Floating

BLAST Floating

DT/R Floating

DEN Floating

LOCK Floating

BREQ Driven (High or low)

D/C Floating

DMA Floating

SUP Floating

FAIL Driven high (Inactive)

DACK3:0 Driven high (Inactive)

EOP3:0/TC3:0 Driven (If output)

34

SPECIAL ENVIRONMENT 80960CA-25, -16

6.0 BUS WAVEFORMS

271327–18

Figure 18. Cold Reset Waveform

35

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–19

Figure 19. Warm Reset Waveform

36

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–20

Figure 20. Entering the ONCE State

37

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–21

NOTE:

Case 1 and Case 2 show two possible polarities of PCLK2:1

Figure 21. Clock Synchronization in the 2-x Clock Mode

271327–22

NOTE:

In 1x clock mode, the RESET

pin is actually sampled on the falling edge of 2xCLK. 2xCLK is an internal signal generated

by the PLL and is not available on an external pin. Therefore, RESET

is specified relative to the rising edge of CLKIN.

The RESET

pin is sampled when PCLK is high.

Figure 22. Clock Synchronization in the 1-x Clock Mode

38

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–23

Figure 23. Non-Burst, Non-Pipelined Requests Without Wait States

39

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–24

Figure 24. Non-Burst, Non-Pipelined Read Request With Wait States

40

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–25

Figure 25. Non-Burst, Non-Pipelined Write Request With Wait States

41

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–26

Figure 26. Burst, Non-Pipelined Read Request Without Wait States, 32-Bit Bus

42

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–27

Figure 27. Burst, Non-Pipelined Read Request With Wait States, 32-Bit Bus

43

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–28

Figure 28. Burst, Non-Pipelined Write Request Without Wait States, 32-Bit Bus

44

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–29

Figure 29. Burst, Non-Pipelined Write Request With Wait States, 32-Bit Bus

45

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–30

Figure 30. Burst, Non-Pipelined Read Request With Wait States, 16-Bit Bus

46

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–31

Figure 31. Burst, Non-Pipelined Read Request With Wait States, 8-Bit Bus

47

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–32

Figure 32. Non-Burst, Pipelined Read Request Without Wait States, 32-Bit Bus

48

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–33

Figure 33. Non-Burst, Pipelined Read Request With Wait States, 32-Bit Bus

49

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–34

Figure 34. Burst, Pipelined Read Request Without Wait States, 32-Bit Bus

50

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–35

Figure 35. Burst, Pipelined Read Request With Wait States, 32-Bit Bus

51

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–36

Figure 36. Burst, Pipelined Read Request With Wait States, 16-Bit Bus

52

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–37

Figure 37. Burst, Pipelined Read Request With Wait States, 8-Bit Bus

53

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–38

Figure 38. Using External READY

54

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–39

NOTE:

READY

adds memory access time to data transfers, whether or not the bus access is a burst access. BTERM interrupts

a bus access, whether or not the bus access has more data transfers pending. Either the READY

signal or the BTERM

signal will terminate a bus access if the signal is asserted during the last (or only) data transfer of the bus access.

Figure 39. Terminating a Burst with BTERM

55

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–40

NOTE:

READY

/BTERM must be enabled: N

RAD,NRDD,NWAD,NWDD

e

0

Figure 40. BOFF Functional Timing

56

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–41

Figure 41. HOLD Functional Timing

57

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–42

NOTES:

1. Case 1: DREQ

must deassert before DACK deasserts. Applications are Fly-By and some packing and unpacking

modes in which loads are followed by loads or stores are followed by stores.

2. Case 2: DREQ

must be deasserted by the second clock (rising edge) after DACK is driven high. Applications are non

Fly-By transfers and adjacent load-stores or store-loads.

3. DACKx

is asserted for the duration of a DMA bus request. The request may consist of multiple bus accesses (defined

by ADS and BLAST. Refer to

i960ÉCA Microprocessor User’s Manual

for ‘‘access’’, ‘‘request’’ definitions.

Figure 42. DREQ and DACK Functional Timing

271327–43

NOTE:

EOP has the same AC Timing Requirements as DREQ to prevent unwanted DMA requests. EOP is NOT edge triggered.
EOP

must be held for a minimum of 2 clock cycles then deasserted within 15 clock cycles.

Figure 43. EOP Functional Timing

58

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–44

NOTES:

Terminal Count becomes active during the last bus request of a buffer If the last LOAD/STORE bus request is executed
as multiple bus accesses, the TC will be active for the entire bus request. Refer to the

i960ÉCA Microprocessor User’s

Manual

for further information.

Figure 44. Terminal Count Functional Timing

271327–45

Figure 45. FAIL Functional Timing

59

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–46

Figure 46. A Summary of Aligned and Unaligned Transfers for Little Endian Regions

60

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–47

Figure 47. A Summary of Aligned and Unaligned Transfers for Little Endian Regions (Continued)

61

SPECIAL ENVIRONMENT 80960CA-25, -16

271327–48

Figure 48. Idle Bus Operation

7.0 REVISION HISTORY

New.

62