• Onboard line interface for clock/data recovery and
waveshaping
• 32–bit or 128–bit jitter attenuator
• Generates line build–outs for both 120 ohm and 75
ohm lines
• Frames to FAS, CAS, and CRC4 formats
• Dual onboard two–frame elastic store slip buffers that
can connect to backplanes up to 8.192 MHz
• 8–bit parallel control port that can be used on either
multiplexed or non–multiplexed buses
• Extracts and inserts CAS signaling
• Detects and generates Remote and AIS alarms
• Programmable output clocks for Fractional E1, H0,
and H12 applications
• Fully independent transmit and receive functionality
• Full access to both Si and Sa bits
• Three separate loopbacks for testing
• Large counters for bipolar and code violations, CRC4
code word errors, FAS errors, and E bits
• Pin compatible with DS2151Q T1 Single–Chip Trans-
ceiver
• 5V supply; low power CMOS
• Industrial grade version (–40°C to +85°C) available
(DS2153QN)
DESCRIPTION
The DS2153Q T1 Single–Chip Transceiver (SCT) contains all of the necessary functions for connection to E1
lines. The onboard clock/data recovery circuitry coverts
the AMI/HDB3 E1 waveforms to a NRZ serial stream.
PIN ASSIGNMENT
FUNCTIONAL BLOCKS
FRAMER
ELASTIC STORES
LINE INTERFACE
LONG & SHORT HAUL
PARALLEL CONTROL
PORT
DALLAS
DS2153Q
E1 SCT
ALE
WR
RLINK
RLCLK
DVSS
RCLK
RCHCLK
RSER
RSYNC
RLOS/LOTC
SYSCLK
The DS2153 automatically adjusts to E1 22 AWG (0.6
mm) twisted–pair cables from 0 to 1.5 KM. The device
can generate the necessary G.703 waveshapes for
both 75 ohm and 120 ohm cables. The onboard jitter
Copyright 1995 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
022697 1/48
DS2153Q
attenuator (selectable to either 32 bits or 128 bits) can
be placed in either the transmit or receive data paths.
The framer locates the frame and multiframe boundaries and monitors the data stream for alarms. It is also
used for extracting and inserting signaling data, Si, and
Sa–bit information. The device contains a set of 71
8–bit internal registers which the user can access and
control the operation of the unit. Quick access via the
parallel control port allows a single micro to handle
many E1 lines. The device fully meets all of the latest E1
specifications including ITU G.703, G.704, G.706,
G.823, and I.431 as well as ETSI 300 011 and 300 233.
TABLE OF CONTENTS
1.Introduction
2.Parallel Control Port
3.Control and Test Registers
4.Status and Information Registers
5.Error Count Registers
6.Sa Data Link Control and Operation
7.Signaling Operation
8.Transmit Idle Registers
9.Clock Blocking Registers
10.Elastic Store Operation
11.Additional (Sa) and International (Si)
Bit Operation
12.Line Interface Control Function
13.Timing Diagrams, Synchronization Flowchart,
and Transmit flow Diagram
14.DC and AC Characteristics
1.0 INTRODUCTION
The analog AMI waveform off of the E1 line is transformer coupled into the RRING and RTIP pins of the
DS2153Q. The device recovers clock and data from the
analog signal and passes it through the jitter attenuation
mux to the receive side framer where the digital serial
stream is analyzed to locate the framing pattern. If
needed, the receive side elastic store can be enabled in
order to absorb the phase and frequency differences
between the recovered E1 data stream and an asynchronous backplane clock which is provided at the
SYSCLK input.
The transmit side of the DS2153Q is totally independent
from the receive side in both the clock requirements and
characteristics. The transmit formatter will provide the
necessary data overhead for E1 transmission. Once
the data stream has been prepared for transmission, it is
sent via the jitter attenuation mux to the waveshaping
and line driver functions. The DS2153Q will drive the E1
line from the TTIP and TRING pins via a coupling transformer.
Reader’s Note
This data sheet assumes a particular nomenclature of
the E1 operating environment. There are 32 8–bit timeslots in E1 systems which are numbered 0 to 31. Timeslot 0 is transmitted first and received first. These 32
timeslots are also referred to as channels with a numbering scheme of 1 to 32. Timeslot 0 is identical to channel 1, timeslot 1 is identical to channel 2, and so on.
Each timeslot (or channel) is made up of eight bits which
are numbered 1 to 8. Bit number 1 is the MSB and is
transmitted first. Bit number 8 is the LSB and is transmitted last. Throughout this data sheet, the following
abbreviations will be used:
Sa Bit Insertion
Signaling Insertion
Idle Code Insertion
CRC4 Generation
Transmit Side Formatter
AIS Generation
TSER
Store
Elastic
clock
data
sync
HDB3 Encode
TSYNC
TCHCLK
Timing
Control
TCHBLK
TLINK
Sa
Insert
DS2153Q
TLCLK
Logic
ACLKIXTAL1XTAL2RLOS
XTAL/VCO/PLL
32.768 MHz
Framer Loopback
Remote Loopback
Data
Clock/
Peak
Filter
RRING
Recovery
Detect
RTIP
Jitter Attenuation Mux
Local Loopback
Wave
Line
TRING
Shaping
Drivers
TTIP
(can be placed in either the transmit or receive paths)
(routed to all blocks)
Parallel Control Port
CSWR(R/W)RD(DS)ALE(AS)AD0 – AD7 INT1/INT2
BTS
022697 3/48
DS2153Q
PIN DESCRIPTION Table 1–1
PINSYMBOLTYPEDESCRIPTION
1
2
3
4
5RD(DS)IRead Input (Data Strobe).
6CSIChip Select. Must be low to read or write the port.
7ALE(AS)IAddress Latch Enable (Address Strobe). A positive going edge serves to
8WR(R/W)IWrite Input (Read/Write).
9RLINKOReceive Link Data. Outputs the full receive data stream including the Sa
10RLCLKOReceive Link Clock. 4 KHz to 20 KHz demand clock for the RLINK output;
11DVSS–Digital Signal Ground. 0.0 volts. Should be tied to local ground plane.
12RCLKOReceive Clock. Recovered 2.048 MHz clock.
13RCHCLKOReceive Channel Clock. 256 KHz clock which pulses high during the LSB
14RSEROReceive Serial Data. Received NRZ serial data, updated on rising edges
15RSYNCI/OReceive Sync. An extracted pulse, one RCLK wide, is output at this pin which
16RLOS/LOTCOReceive Loss of Sync/Loss of Transmit Clock. A dual function output.
17SYSCLKISystem Clock. 1.544 MHz or 2.048 MHz clock. Only used when the elastic
18RCHBLKOReceive Channel Block. A user programmable output that can be forced
19ACLKIIAlternate Clock Input. Upon a receive carrier loss, the clock applied at this
AD4
AD5
AD6
AD7
I/OAddress/Data Bus. A 8–bit multiplexed address/data bus.
demultiplex the bus.
bits. See Section 13 for timing details.
controlled by RCR2. See Section 13 for timing details.
of each channel. Useful for parallel to serial conversion of channel data. See
Section 13 for timing details.
of RCLK or SYSCLK.
identifies either frame (RCR1.6=0) or multiframe boundaries (RCR1.6=1). If
the elastic store is enabled via the RCR2.1, then this pin can be enabled to be
an input via RCR1.5 at which a frame boundary pulse is applied. See Section
13 for timing details.
If TCR2.0=0, will toggle high when the synchronizer is searching for the E1
frame and multiframe; if TCR2.0=1, will toggle high if the TCLK pin has not
toggled for 5 µs.
store functions are enabled via RCR2.1. Should be tied low in applications
that do not use the elastic store. If tied high for at least 100 µs, will force all
output pins (including the parallel port) to 3–state.
high or low during any of the 32 E1 channels. Useful for blocking clocks to
a serial UART or LAPD controller in applications where not all E1 channels
are used such as Fractional E1, 384K bps service (H0), 1920K bps (H12),
or ISDN–PRI. Also useful for locating individual channels in drop–and–insert
applications. See Section 13 for timing details.
pin (normally 2.048 MHz) will be routed to the RCLK pin. If no clock is routed
to this pin, then it should be tied to DVSS.
022697 4/48
DS2153Q
PINDESCRIPTIONTYPESYMBOL
20BTSIBus Type Select. Strap high to select Motorola bus timing; strap low to
select Intel bus timing. This pin controls the function of the RD
ALE(AS), and WR
(R/W) pins. If BTS=1, then these pins assume the function
(DS),
listed in parenthesis ().
21
22
RTIP
RRING
–Receive Tip and Ring. Analog inputs for clock recovery circuitry; connects
to a 1:1 transformer (see Section 12 for details).
23RVDD–Receive Analog Positive Supply. 5.0 volts. Should be tied to DVDD and
TVDD pins.
24RVSS–Receive Signal Ground. 0.0 volts. Should be tied to local ground plane.
25
26
XTAL1
XTAL2
–Crystal Connections. A pullable 8.192 MHz crystal must be applied to
these pins. See Section 12 for crystal specifications.
27INT1OReceive Alarm Interrupt 1. Flags host controller during alarm conditions
defined in Status Register 1. Active low, open drain output.
28INT2OReceive Alarm Interrupt 2. Flags host controller during conditions defined
in Status Register 2. Active low, open drain output.
29TTIP–Transmit Tip. Analog line driver output; connects to a step–up transformer
(see Section 12 for details).
30TVSS–Transmit Signal Ground. 0.0 volts. Should be tied to local ground plane.
31TVDD–Transmit Analog Positive Supply. 5.0 volts. Should be tied to DVDD and
RVDD pins.
32TRING–Transmit Ring. Analog line driver outputs; connects to a step–up trans-
former (see Section 12 for details).
33TCHBLKOTransmit Channel Block. A user programmable output that can be forced
high or low during any of the 32 E1 channels. Useful for blocking clocks to
a serial UART or LAPD controller in applications where not all E1 channels
are used such as Fractional E1, 384K bps service (H0), 1920K bps (H12),
or ISDN–PRI. Also useful for locating individual channels in drop–and–insert
applications. See Section 13 for timing details.
34TLCLKOTransmit Link Clock. 4 KHz to 20 KHz demand clock for the TLINK input;
controlled by TCR2. See Section 13 for timing details.
35TLINKITransmit Link Data. If enabled, this pin will be sampled on the falling edge
of TCLK to insert the Sa bits See Section 13 for timing details.
36TSYNCI/OTransmit Sync. A pulse at this pin will establish either frame or multiframe
boundaries for the DS2153Q. Via TCR1.1, the DS2153Q can be pro-
grammed to output either a frame or multiframe pulse at this pin. See Section
13 for timing details.
37DVDD–Digital Positive Supply. 5.0 volts. Should be tied to RVDD and TVDD pins.
38TCLKITransmit Clock. 2.048 MHz primary clock. Needed for proper operation of
the parallel control port.
39TSERITransmit Serial Data. Transmit NRZ serial data, sampled on the falling edge
of TCLK.
022697 5/48
DS2153Q
PINDESCRIPTIONTYPESYMBOL
40TCHCLKOTransmit Channel Clock. 256 KHz clock which pulses high during the LSB
of each channel. Useful for parallel to serial conversion of channel data. See
Section 13 for timing details.
41
42
43
44
AD0
AD1
AD2
AD3
I/OAddress/Data Bus. A 8–bit multiplexed address/data bus.
Note: the Test Registers 1 and 2 are used only by the factory; these registers must be cleared (set to all zeros) on
power–up initialization to insure proper operation.
2.0 PARALLEL PORT
The DS2153Q is controlled via a mutliplexed bidirectional address/data bus by an external microcontroller
terminated and the bus returns to a high impedance
state as RD
transitions high in Intel timing or as DS tran-
sitions low in Motorola timing.
or microprocessor. The DS2153Q can operate with
either Intel or Motorola bus timing configurations. If the
BTS pin is tied low, Intel timing will be selected; if tied
high, Motorola timing will be selected. All Motorola bus
signals are listed in parenthesis (). See the timing diagrams in the AC Electrical Characteristics for more
details. The mutliplexed bus on the DS2153Q saves
pins because the address information and data information share the same signal paths. The addresses are
presented to the pins in the first portion of the bus cycle
and data will be transferred on the pins during second
portion of the bus cycle. Addresses must be valid prior
to the falling edge of ALE(AS), at which time the
DS2153Q latches the address from the AD0 to AD7
pins. Valid write data must be present and held stable
during the later portion of the DS WR
pulses. In a read
cycle, the DS2153Q outputs a byte of data during the
latter portion of the DS or RD
pulses. The read cycle is
3.0 CONTROL AND TEST REGISTERS
The operation of the DS2153Q is configured via a set of
seven registers. Typically , the control registers are only
accessed when the system is first powered up. Once
the DS2153Q has been initialized, the control registers
will only need to be accessed when there is a change in
the system configuration. There are two Receive Control Register (RCR1 and RCR2), two Transmit Control
Registers (TCR1 and TCR2), and three Common Control Registers (CCR1, CCR2 and CCR3). Each of the
seven registers are described in this section.
The T est Registers at addresses 15 and 19 hex are used
by the factory in testing the DS2153Q. On power–up,
the T est Registers should be set to 00 hex in order for the
DS2153Q to operate properly.
022697 7/48
DS2153Q
RCR1: RECEIVE CONTROL REGISTER 1 (Address=10 Hex)
(MSB)(LSB)
RSMFRSMRSIO––FRCSYNCERESYNC
SYMBOLPOSITIONNAME AND DESCRIPTION
RSMFRCR1.7RSYNC Multiframe Function. Only used if the RSYNC pin is pro-
RSMRCR1.6RSYNC Mode Select.
RSIORCR1.5RSYNC I/O Select.
–RCR1.4Not Assigned. Should be set to zero when written.
–RCR1.3Not Assigned. Should be set to zero when written.
FRCRCR1.2Frame Resync Criteria.
SYNCERCR1.1Sync Enable.
RESYNCRCR1.0Resync. When toggled from low to high, a resync is initiated. Must be
grammed in the multiframe mode (RCR1.6=1).
0=RSYNC outputs CAS multiframe boundaries
1=RSYNC outputs CRC4 multiframe boundaries
0=frame mode (see the timing in Section 13)
1=multiframe mode (see the timing in Section 13)
0=RSYNC is an output (depends on RCR1.6)
1=RSYNC is an input (only valid if elastic store enabled) (note: this bit must
be set to zero when RCR2.1=0)
0=resync if FAS received in error 3 consecutive times
1=resync if FAS or bit 2 of non–F AS is received in error 3 consecutive times
0=auto resync enabled
1=auto resync disabled
cleared and set again for a subsequent resync.
SYNC/RESYNC CRITERIA Table 3–1
FRAME OR
MULTIFRAME
LEVEL
FASFAS present in frames N and N +
CRC4Two valid MF alignment words
CASValid MF alignment word found
022697 8/48
SYNC CRITERIARESYNC CRITERIAITU SPEC.
2, and FAS not present in frame
N + 1.
found within 8 ms.
and previous time slot 16 contains code other than all zeros.
Three consecutive incorrect FAS
received.
Alternate (RCR1.2=1) the above
criteria is met or three consecutive incorrect bit 2 of non–FAS
received.
915 or more CRC4 code words
out of 1000 received in error.
Two consecutive MF alignment
words received in error.
G.706
4.1.1
4.1.2
G.706
4.2
4.3.2
G.732
5.2
RCR2: RECEIVE CONTROL REGISTER 2 (Address=11 Hex)
(MSB)(LSB)
Sa8SSa7SSa6SSa5SSa4SRSCLKMRESE–
SYMBOLPOSITIONNAME AND DESCRIPTION
Sa8SRCR2.7Sa8 Bit Select. Set to one to report the Sa8 bit at the RLINK pin; set to zero
to not report the Sa8 bit.
Sa7SRCR2.6Sa7 Bit Select. Set to one to report the Sa7 bit at the RLINK pin; set to zero
to not report the Sa7 bit.
Sa6SRCR2.5Sa6 Bit Select. Set to one to report the Sa6 bit at the RLINK pin; set to zero
to not report the Sa6 bit.
Sa5SRCR2.4Sa5 Bit Select. Set to one to report the Sa5 bit at the RLINK pin; set to zero
to not report the Sa5 bit.
Sa4SRCR2.3Sa4 Bit Select. Set to one to report the Sa4 bit at the RLINK pin; set to zero
to not report the Sa4 bit.
RSCLKMRCR2.2Receive Side SYSCLK Mode Select.
0=if SYSCLK is 1.544 MHz
1=if SYSCLK is 2.048 MHz
RESERCR2.1Receive Side Elastic Store Enable.
0=elastic store is bypassed
1=elastic store is enabled
–RCR2.0Not Assigned. Should be set to zero when written.
DS2153Q
TCR1: TRANSMIT CONTROL REGISTER 1 (Address=12 Hex)
(MSB)(LSB)
–
SYMBOLPOSITIONNAME AND DESCRIPTION
–TCR1.7Not Assigned. Should be set to zero when written to.
TFPTTCR1.6Transmit Timeslot 0 Pass Through.
T16STCR1.5T ransmit T imeslot 16 Data Select .
TUA1TCR1.4Transmit Unframed All Ones.
TSiSTCR1.3Transmit International Bit Select.
TFPTT16STUA1TSiSTSA1TSMTSIO
0=FAS bits/Sa bits/Remote Alarm sourced internally from the TAF and
TNAF registers
1=FAS bits/Sa bits/Remote Alarm sourced from TSER
0=sample timeslot 16 at TSER pin
1=source timeslot 16 from TS1 to TS16 registers
0=transmit data normally
1=transmit an unframed all one’s code at TPOS and TNEG
0=sample Si bits at TSER pin
1=source Si bits from TAF and TNAF registers (in this mode, TCR1.6 must
be set to 0)
022697 9/48
DS2153Q
TSA1TCR1.2Transmit Signaling All Ones.
0=normal operation
1=force timeslot 16 in every frame to all ones
TSMTCR1.1TSYNC Mode Select.
0=frame mode (see the timing in Section 13)
1=CAS and CRC4 multiframe mode (see the timing in Section 13)
TSIOTCR1.0TSYNC I/O Select.
0=TSYNC is an input
1=TSYNC is an output
Note: See Figure 13–9 for more details about how the Transmit Control Registers affect the operation of the
DS2153Q.
TCR2: TRANSMIT CONTROL REGISTER 2 (Address=13 Hex)
(MSB)(LSB)
Sa8SSa7SSa6SSa5SSa4S–AEBEP16F
SYMBOLPOSITIONNAME AND DESCRIPTION
Sa8STCR2.7Sa8 Bit Select. Set to one to source the Sa8 bit from the TLINK pin; set to
Sa7STCR2.6Sa7 Bit Select. Set to one to source the Sa7 bit from the TLINK pin; set to
Sa6STCR2.5Sa6 Bit Select. Set to one to source the Sa6 bit from the TLINK pin; set to
Sa5STCR2.4Sa5 Bit Select. Set to one to source the Sa5 bit from the TLINK pin; set to
Sa4STCR2.3Sa4 Bit Select. Set to one to source the Sa4 bit from the TLINK pin; set to
–TCR2.2Not Assigned. Should be set to zero when written.
AEBETCR2.1Automatic E–Bit Enable.
P16FTCR2.0Function of Pin 16.
zero to not source the Sa8 bit.
zero to not source the Sa7 bit.
zero to not source the Sa6 bit.
zero to not source the Sa5 bit.
zero to not source the Sa4 bit.
0=E–bits not automatically set in the transmit direction
1=E–bits automatically set in the transmit direction
0=Receive Loss of Sync (RLOS)
1=Loss of Transmit Clock (LOTC)
CCR1: COMMON CONTROL REGISTER 1 (Address=14 Hex)
(MSB)(LSB)
FLB
SYMBOLPOSITIONNAME AND DESCRIPTION
FLBCCR1.7Framer Loopback.
022697 10/48
THDB3TG802TCRC4RSMRHDB3RG802RCRC4
0=loopback disabled
1=loopback enabled
DS2153Q
THDB3CCR1.6Transmit HDB3 Enable.
0=HDB3 disabled
1=HDB3 enabled
TG802CCR1.5Transmit G.802 Enable. See Section 13 for details.
0=do not force TCHBLK high during bit 1 of timeslot 26
1=force TCHBLK high during bit 1 of timeslot 26
TCRC4CCR1.4Transmit CRC4 Enable.
0=CRC4 disabled
1=CRC4 enabled
RSMCCR1.3Receive Signaling Mode Select.
0=CAS signaling mode
1=CCS signaling mode
RHDB3CCR1.2Receive HDB3 Enable.
0=HDB3 disabled
1=HDB3 enabled
RG802CCR1.1Receive G.802 Enable. See Section 13 for details.
0=do not force RCHBLK high during bit 1 of timeslot 26
1=force RCHBLK high during bit 1 of timeslot 26
RCRC4CCR1.0Receive CRC4 Enable.
0=CRC4 disabled
1=CRC4 enabled
FRAMER LOOPBACK
When CCR1.7 is set to a one, the DS2153Q will enter a
Framer LoopBack (FLB) mode. This loopback is useful
in testing and debugging applications. In FLB, the
DS2153Q will loop data from the transmit side back to
the receive side. When FLB is enabled, the following
will occur:
1. data will be transmitted as normal at TTIP and
TRING
2. data off the E1 line at RTIP and RRING will be
ignored
3. the RCLK output will be replaced with the TCLK
input.
CCR2: COMMON CONTROL REGISTER 2 (Address=1A Hex)
(MSB)(LSB)
ECUS
SYMBOLPOSITIONNAME AND DESCRIPTION
ECUSCCR2.7Error Counter Update Select.
VCRFSCCR2.6VCR Function Select.
AAISCCR2.5Automatic AIS Generation.
ARACCR2.4Automatic Remote Alarm Generation.
VCRFSAAISARARSERCLOTCMCRLBLLB
0=update error counters once a second
1=update error counters every 62.5 ms (500 frames)
LOTCMCCCR2.2Loss of Transmit Clock Mux Control. Determines whether the transmit
RLBCCR2.1Remote Loopback.
LLBCCR2.0Local Loopback.
REMOTE LOOPBACK
When CCR2.1 is set to a one, the DS2153Q will be
forced into Remote LoopBack (RLB). In this loopback,
data recovered off of the E1 line from the RTIP and
RRING pins will be transmitted back onto the E1 line
(with any BPV’s that might have occurred intact) via the
TTIP and TRING pins. Data will continue to pass
through the receive side of the DS2153Q as it would
normally and the data at the TSER pin will be ignored.
Data in this loopback will pass through the jitter attenuator. Please see Figure 1.1 for more details.
LOCAL LOOPBACK
When CCR2.0 is set to a one, the DS2153Q will be
forced into Local LoopBack (LLB). In this loopback,
data will continue to be transmitted as normal through
0=allow RSER to output data as received under all conditions
1=force RSER to one under loss of frame alignment conditions
side formatter should switch to the ever present RCLK if the TCLK should
fail to transition (see Figure 1.1).
0=do not switch to RCLK if TCLK stops
1=switch to RCLK if TCLK stops
0=loopback disabled
1=loopback enabled
0=loopback disabled
1=loopback enabled
the transmit side of the SCT. Data being received at
RTIP and RRING will be replaced with the data being
transmitted. Data in this loopback will pass through the
jitter attenuator . Please see Figure 1.1 for more details.
AUTOMATIC ALARM GENERATION
When either CCR2.4 or CCR2.5 is set to one, the
DS2153Q monitors the receive side to determine if any
of the following conditions are present: loss of receive
frame synchronization, AIS alarm (all ones) reception,
or loss of receive carrier (or signal). If any one (or more)
of the above conditions is present, then the DS2151Q
will either force an AIS alarm (if CCR2.5=1) or a Remote
Alarm (CCR2.4=1) to be transmitted via the TTIP and
TRING pins. It is an illegal state to have both CCR2.4
and CCR2.5 set to one at the same time.
CCR3: COMMON CONTROL REGISTER 3 (Address=1B Hex)
(MSB)(LSB)
TESETCBFSTIRFSESRLIRST–TSCLKM–
SYMBOLPOSITIONNAME AND DESCRIPTION
TESECCR3.7Transmit Elastic Store Enable.
TCBFSCCR3.6Transmit Channel Blocking Registers (TCBR) Function Select.
TIRFSCCR3.5T ransmit Idle Registers (TIR) Function Select.
ESRCCR3.4Elastic Stores Reset. Setting this bit from a one to a zero will force the
022697 12/48
0 = elastic store is disabled
1 = elastic store is enabled
0=TCBRs define the operation of the TCHBLK output pin
1=TCBRs define which signaling bits are to be inserted
0=TIRs define in which channels to insert idle code
1=TIRs define in which channels to insert data from RSER
elastic stores to a known depth. Should be toggled after SYSCLK has been
DS2153Q
applied and is stable. Must be set and cleared again for a subsequent
reset. Do not leave this bit set high.
LIRSTCCR3.3Line Interface Reset. Setting this bit from a zero to a one will initiate an
internal reset that affects the slicer, AGC, clock recovery state machine,
and jitter attenuator . Normally this bit is only toggled on power–up. Must be
cleared and set again for a subsequent reset.
–CCR3.2Not Assigned. Should be set to zero when written.
TSCLKMCCR3.1T ransmit Backplane Clock Select. Must be set like RCR2.2.
0 = 1.544 MHz
1 = 2.048 MHz
–CCR3.0Not Assigned. Should be set to zero when written.
POWER–UP SEQUENCE
On power–up, after the supplies are stable, the
DS2153Q should be configured for operation by writing
to all of the internal registers (this includes the T est Registers) since the contents of the internal registers cannot
be predicted on power–up. Next, the LIRST bit should
be toggled from zero to one to reset the line interface circuitry (it will take the DS2153Q about 40 ms to recover
from the LIRST bit being toggled). Finally, after the SYSCLK input is stable, the ESR bit should be toggled from
a zero to a one and back to zero (this step can be
skipped if the elastic store is not being used).
4.0 STATUS AND INFORMATION
REGISTERS
There is a set of four registers that contain information
on the current real time status of the DS2153Q, Status
Register 1 (SR1), Status Register 2 (SR2), Receive
Information Register (RIR), and Synchronizer Status
Register (SSR). When a particular event has occurred
(or is occurring), the appropriate bit in one of these four
registers will be set to a one. All of the bits in these registers operate in a latched fashion (except for the SSR).
This means that if an event occurs and a bit is set to a
one in any of the registers, it will remain set until the user
reads that bit. The bit will be cleared when it is read and
it will not be set again until the event has occurred again
or if the alarm is still present.
The user will always precede a read of the SR1, SR2,
and RIR registers with a write. The byte written to the
register will inform the DS2153Q which bits the user
wishes to read and have cleared. The user will write a
byte to one of these three registers, with a one in the bit
positions he or she wishes to read and a zero in the bit
positions he or she does not wish to obtain the latest
information on. When a one is written to a bit location,
the read register will be updated with current value and it
will be cleared. When a zero is written to a bit position,
the read register will not be updated and the previous
value will be held. A write to the status and information
registers will be immediately followed by a read of the
same register. The read result should be logically
AND’ed with the mask byte that was just written and this
value should be written back into the same register to
insure that bit does indeed clear. This second write step
is necessary because the alarms and events in the status registers occur asynchronously in respect to their
access via the parallel port. This write–read–write
scheme allows an external microcontroller or microprocessor to individually poll certain bits without disturbing
the other bits in the register. This operation is key in controlling the DS2153Q with higher–order software languages.
The SSR register operates differently than the other
three. It is a read only register and it reports the status of
the synchronizer in real time. This register is not latched
and it is not necessary to precede a read of this registers
with a write.
The SR1 and SR2 registers have the unique ability to
initiate a hardware interrupt via the INT1
and INT2 pins
respectively. Each of the alarms and events in the SR1
and SR2 can be either masked or unmasked from the
interrupt pins via the Interrupt Mask Register 1 (IMR1)
and Interrupt Mask Register 2 (IMR2) respectively.
022697 13/48
DS2153Q
RIR: RECEIVE INFORMATION REGISTER (Address=08 Hex)
(MSB)(LSB)
TESFTESEJALTRESFRESECRCRCFASRCCASRC
SYMBOLPOSITIONNAME AND DESCRIPTION
TESFRIR.7Transmit Elastic Store Full. Set when the elastic store fills and a frame is
TESERIR.6Transmit Elastic Store Empty . Set when the elastic store empties and a
JALTRIR.5Jitter Attenuator Limit Trip. Set when the jitter attenuator FIFO reaches to
RESFRIR.4Elastic Store Full. Set when the elastic store buffer fills and a frame is
RESERIR.3Elastic Store Empty. Set when the elastic store buffer empties and a
CRCRCRIR.2CRC Resync Criteria Met. Set when 915/1000 code words are received in
FASRCRIR.1FAS Resync Criteria Met. Set when three consecutive FAS words are
CASRCRIR.0CAS Resync Criteria Met. Set when two consecutive CAS MF alignment
deleted.
frame is repeated.
within 4–bits of it’s limit; useful for debugging jitter attenuation operation.
deleted.
frame is repeated.
error.
received in error.
words are received in error.
SSR: SYNCHRONIZER STATUS REGISTER (Address=1E Hex)
(MSB)(LSB)
CSC5
SYMBOLPOSITIONNAME AND DESCRIPTION
CSC5SSR.7CRC4 Sync Counter Bit 5. MSB of the 6–bit counter.
CSC4SSR.6CRC4 Sync Counter Bit 4.
CSC3SSR.5CRC4 Sync Counter Bit 3.
CSC2SSR.4CRC4 Sync Counter Bit 2.
CSC0SSR.3CRC4 Sync Counter Bit 0. LSB of the 6–bit counter. The next to LSB bit is
FASSASSR.2F AS Sync Active. Set while the synchronizer is searching for alignment at
CASSASSR.1CAS MF Sync Active. Set while the synchronizer is searching for the CAS
CRC4SASSR.0CRC4 MF Sync Active. Set while the synchronizer is searching for the
022697 14/48
CSC4CSC3CSC2CSC0FASSACASSACRC4SA
not accessible. This bit will toggle each time the CRC4 MF search times out
at 8 ms.
the FAS level.
MF alignment word.
CRC4 MF alignment word.
DS2153Q
CRC4 SYNC COUNTER
The CRC4 Sync Counter increments each time the 8 ms
CRC4 multiframe search times out. The counter is
cleared when the DS2153Q has successfully obtained
synchronization at the CRC4 level. The counter can
also be cleared by disabling the CRC4 mode
amount of time the DS2153Q has been searching for
synchronization at the CRC4 level. Annex B of CCITT
G.706 suggests that if synchronization at the CRC4
level cannot be obtained within 400 ms, then the search
should be abandoned and proper action taken. The
CRC4 Sync Counter will rollover.
(CCR1.0=0). This counter is useful for determining the
SR1: STATUS REGISTER 1 (Address=06 Hex)
(MSB)(LSB)
RSA1
SYMBOLPOSITIONNAME AND DESCRIPTION
RSA1SR1.7Receive Signaling All Ones. Set when the contents of timeslot 16 con-
RDMASR1.6Receive Distant MF Alarm. Set when bit 6 of timeslot 16 in frame 0 has
RSA0SR1.5Receive Signaling All Zeros. Set when over a full MF, timeslot 16 con-
RSLIPSR1.4Receive Elastic Store Slip Occurrence. Set when the elastic store has
RUA1SR1.3Receive Unframed All Ones. Set when an unframed all ones code is
RRASR1.2Receive Remote Alarm. Set when a remote alarm is received at RTIP and
RCLSR1.1Receive Carrier Loss. Set when 255 consecutive zeros have been
RLOSSR1.0Receive Loss of Sync. Set when the device is not synchronized to the
RDMARSA0RSLIPRUA1RRARCLRLOS
tains less than three zeros over 16 consecutive frames. This alarm is not
disabled in the CCS signaling mode.
been set for two consecutive multiframes. This alarm is not disabled in the
CCS signaling mode.
tains all zeros.
either repeated or deleted a frame of data.
received at RTIP and RRING.
RRING.
detected at RTIP and RRING.
receive E1 stream.
022697 15/48
DS2153Q
ALARM CRITERIA Table 4–1
ALARMSET CRITERIACLEAR CRITERIA
RSA1
(receive signaling
all ones)
RSA0
(receive signaling
all zeros)
RDMA
(receive distant
over 16 consecutive frames (one full
MF) timeslot 16 contains less than 3
zeros
over 16 consecutive frames (one full
MF) timeslot 16 contains all zeros
bit 6 in timeslot 16 of frame 0 set to
one for two consecutive MF
over 16 consecutive frames (one full
MF) timeslot 16 contains 3 or more
zeros
over 16 consecutive frames (one full
MF) timeslot 16 contains at least a
single one
bit 6 in timeslot 16 of frame 0 set to
zero for a two consecutive MF
multiframe alarm)
RUA1
(receive unframed
less than 3 zeros in two frames (512
bits)
more than 2 zeros in two frames (512
bits)
all ones)
RRA
(receive remote
bit 3 of non–align frame set to one for
3 consecutive occasions
bit 3 of non–align frame set to zero for
3 consecutive occasions
alarm)
RCL
(receive carrier
255 consecutive zeros receivedin 255–bit times, at least 32 ones are
received
loss)
SR2: STATUS REGISTER 2 (Address=07 Hex)
(MSB)(LSB)
RMFRAFTMFSECTAFLOTCRCMFTSLIP
CCITT
SPEC.
G.732
4.2
G.732
5.2
O.162
2.1.5
O.162
1.6.1.2
O.162
2.1.4
G.775
SYMBOLPOSITIONNAME AND DESCRIPTION
RMFSR2.7Receive CAS Multiframe. Set every 2 ms (regardless if CAS signaling is
enabled or not) on receive multiframe boundaries. Used to alert the host
that signaling data is available.
RAFSR2.6Receive Align Frame. Set every 250 µs at the beginning of align frames.
Used to alert the host that Si and Sa bits are available in the RAF and RNAF
registers.
TMFSR2.5T ransmit Multiframe. Set every 2 ms (regardless if CRC4 is enabled) on
transmit multiframe boundaries. Used to alert the host that signaling data
needs to be updated.
SECSR2.4One Second Timer . Set on increments of one second based on RCLK. If
CCR2.7=1, then this bit will be set every 62.5 ms instead of once a second.
TAFSR2.3Transmit Align Frame. Set every 250 µs at the beginning of align frames.
Used to alert the host that the TAF and TNAF registers need to be updated.
LOTCSR2.2Loss of T ransmit Clock. Set when the TCLK pin has not transitioned for
one channel time (or 3.9 µs). Will force pin 16 high if enabled via TCR2.0.
Based on RCLK.
RCMFSR2.1Receive CRC4 Multiframe. Set on CRC4 multiframe boundaries; will con-
tinue to be set every 2 ms on an arbitrary boundary if CRC4 is disabled.
TSLIPSR2.0Transmit Elastic Store Slip. Set when the elastic store has either re-
peated or deleted a frame of data.
022697 16/48
IMR1: INTERRUPT MASK REGISTER 1 (Address=16 Hex)
(MSB)(LSB)
RSA1RDMARSA0RSLIPRUA1RRARCLRLOS
SYMBOLPOSITIONNAME AND DESCRIPTION
RSA1IMR1.7Receive Signaling All Ones.
0=interrupt masked
1=interrupt enabled
RDMAIMR1.6Receive Distant MF Alarm.
0=interrupt masked
1=interrupt enabled
RSA0IMR1.5Receive Signaling All Zeros.
0=interrupt masked
1=interrupt enabled
RSLIPIMR1.4Receive Elastic Store Slip Occurrence.
0=interrupt masked
1=interrupt enabled
RUA1IMR1.3Receive Unframed All Ones.
0=interrupt masked
1=interrupt enabled
RRAIMR1.2Receive Remote Alarm.
0=interrupt masked
1=interrupt enabled
RCLIMR1.1Receive Carrier Loss.
0=interrupt masked
1=interrupt enabled
RLOSIMR1.0Receive Loss of Sync.
0=interrupt masked
1=interrupt enabled
DS2153Q
022697 17/48
DS2153Q
IMR2: INTERRUPT MASK REGISTER 2 (Address=17 Hex)
(MSB)(LSB)
RMFRAFTMFSECTAFLOTCRCMFTSLIP
SYMBOLPOSITIONNAME AND DESCRIPTION
RMFIMR2.7Receive CAS Multiframe.
RAFIMR2.6Receive Align Frame.
TMFIMR2.5T ransmit Multiframe.
SECIMR2.4One Second Timer.
TAFIMR2.3Transmit Align Frame.
LOTCIMR2.2Loss Of Transmit Clock.
RCMFIMR2.1Receive CRC4 Multiframe.
TSLIPIMR2.0Transmit Side Elastic Store Slip.
5.0 ERROR COUNT REGISTERS
There are a set of four counters in the DS2153Q that
record bipolar or code violations, errors in the CRC4
SMF code words, E
bits as reported by the far end, and word errors in the
FAS. Each of these four counters are automatically
updated on either one second boundaries (CCR2.7=0)
or every 62.5 ms (CCR2.7=1) as determined by the
timer in Status Register 2 (SR2.4). Hence, these registers contain performance data from either the previous
second or the previous 62.5 ms. The user can use the
interrupt from the timer to determine when to read these
registers. The user has a full second
(or 62.5 ms) to read the counters before the data is lost.
5.1 BPV or Code Violation Counter
Violation Count Register 1 (VCR1) is the most significant word and VCR2 is the least significant word of a
0=interrupt masked
1=interrupt enabled
0=interrupt masked
1=interrupt enabled
0=interrupt masked
1=interrupt enabled
0=interrupt masked
1=interrupt enabled
0=interrupt masked
1=interrupt enabled
0=interrupt masked
1=interrupt enabled
0=interrupt masked
1=interrupt enabled
0 = interrupt masked
1 = interrupt enabled
16–bit counter that records either BiPolar Violations
(BPVs) or Code Violations (CVs). If CCR2.6=0, then the
VCR counts bipolar violations. Bipolar violations are
defined as consecutive marks of the same polarity. In
this mode, if the HDB3 mode is set for the receive side
via CCR1.2, then HDB3 code words are not counted as
BPVs. If CCR2.6=1, then the VCR counts code violations as defined in CCITT O.161. Code violations are
defined as consecutive bipolar violations of the same
polarity . In most applications, the DS2153Q should be
programmed to count BPVs when receiving AMI code
and to count CVs when receiving HDB3 code. This
counter increments at all times and is not disabled by
loss of sync conditions. The counter saturates at 65,535
and will not rollover. The bit error rate on a E1 line would
have to be greater than 10**–2 before the VCR would
saturate.
V15VCR1.7MSB of the 16–bit bipolar or code violation count
V0VCR2.0LSB of the 16–bit bipolar or code violation count
DS2153Q
VCR1
VCR2
5.2 CRC4 Error Counter
CRC4 Count Register 1 (CRCCR1) is the most significant word and CRCCR2 is the least significant word of a
10–bit counter that records word errors in the Cyclic
Redundancy Check 4 (CRC4). Since the maximum
CRC4 count in a one second period is 1000, this counter
cannot saturate. The counter is disabled during loss of
sync at either the FAS or CRC4 level; it will continue to
count if loss of multiframe sync occurs at the CAS level.
CRC9CRCCR1.1MSB of the 10–bit CRC4 error count
CRC0CRCCR2.0LSB of the 10–bit CRC4 error count
CRCCR1
CRCCR2
NOTES:
1. The upper six bits of CRCCR1 at address 02 are the most significant bits of the 12–bit FAS error counter.
5.3 E–Bit Counter
E–bit Count Register 1 (EBCR1) is the most significant
word and EBCR2 is the least significant word of a 10–bit
counter that records Far End Block Errors (FEBE) as
reported in the first bit of frames 13 and 15 on E1 lines
running with CRC4 multiframe. These count registers
will increment once each time the received E–bit is set to
zero. Since the maximum E–bit count in a one second
period is 1000, this counter cannot saturate. The
counter is disabled during loss of sync at either the FAS
or CRC4 level; it will continue to count if loss of multiframe sync occurs at the CAS level.
EB9EBCR1.1MSB of the 10–bit E–Bit count
EB0EBCR2.0LSB of the 10–bit E–Bit count
EBCR1
EBCR2
NOTES:
1. The upper six bits of EBCR1 at address 04 are the least significant bits of the 12–bit FAS error counter.
5.4 FAS Bit Error Counter
FAS Count Register 1 (F ASCR1) is the most significant
word and FASCR2 is the least significant word of a
12–bit counter that records word errors in the Frame
Alignment Signal in timeslot 0. This counter is disabled
during loss of frame synchronization conditions, it is not
disabled during loss of synchronization at either the
CAS or CRC4 multiframe level. Since the maximum
FAS word error count in a one second period is 4000,
this counter cannot saturate.
FASCR1: FAS BIT COUNT REGISTER 1 (Address=02 Hex)
FASCR2: FAS BIT COUNT REGISTER 2 (Address=04 Hex)
(MSB)(LSB)
FAS11FAS10FAS9FAS8FAS7FAS6(note 2)(note 2)
FAS5FAS4FAS3F AS2FAS1FAS0(note 1)(note 1)
SYMBOLPOSITIONNAME AND DESCRIPTION
FAS11FASCR1.7MSB of the 12–bit FAS error count
FAS0FASCR2.2LSB of the 12–bit FAS error count
FASCR1
FASCR2
NOTES:
1. The lower two bits of FASCR1 at address 02 are the most significant bits of the 10–bit CRC4 error counter.
2. The lower two bits of FASCR2 at address 04 are the most significant bits of the 10–bit E–Bit counter.
6.0 Sa DATA LINK CONTROL AND
OPERATION
The DS2153Q provides for access to the proposed E1
performance monitor data link in the Sa bit positions.
The device allows access to the Sa bits either via a set of
two internal registers (RNAF and TNAF) or via two
external pins (RLINK and TLINK).
On the receive side, the Sa bits are always reported in
the internal RNAF register (see Section 11 for more
details). All five Sa bits are always output at the RLINK
pin. See Section 13 for detailed timing. Via RCR2, the
user can control the RLCLK pin to pulse during any combination of Sa bits. This allows the user to create a clock
that can be used to capture the needed Sa bits.
On the transmit side, the individual Sa bits can be either
sourced from the internal TNAF register (TCR1.6=0) or
from the external TLINK pin. Via TCR2, the DS2153Q
can be programmed to source any combination of the
022697 20/48
DS2153Q
additional bits from the TLINK pin. If the user wishes to
pass the Sa bits through the DS2153Q without them
being altered, then the device should be set up to source
all five Sa bits via the TLINK pin and the TLINK pin
should be tied to the TSER pin. Please see the timing
diagrams and the transmit data flow diagram in Section
13 for examples.
receive stream and inserted into the transmit stream by
the DS2153Q. Each of the 30 channels has four signaling bits (A/B/C/D) associated with it. The numbers in
parenthesis () are the channel associated with a particular signaling bit. The channel numbers have been
assigned as described in the ITU documents. For
example, channel 1 is associated with timeslot 1 and
channel 30 is associated with timeslot 31. There is a set
7.0 SIGNALING OPERATION
The Channel Associated Signaling (CAS) bits
embedded in the E1 stream can be extracted from the
of 16 registers for the receive side (RS1 to RS16) and 16
registers on the transmit side (TS1 to TS16). The
signaling registers are detailed below.
RS1 TO RS16: RECEIVE SIGNALING REGISTERS (Address=30 to 3F Hex)
XRS1.0/1/3Spare Bits
YRS1.2Remote Alarm Bit (integrated and reported in SR1.6)
A(1)RS2.7Signaling Bit A for Channel 1
D(30)RS16.0Signaling Bit D for Channel 30
Each Receive Signaling Register (RS1 to RS16) reports
the incoming signaling from two timeslots. The bits in
the Receive Signaling Registers are updated on multiframe boundaries so the user can utilize the Receive
Multiframe Interrupt in the Receive Status Register 2
(SR2.7) to know when to retrieve the signaling bits. The
user has a full 2 ms to retrieve the signaling bits before
the data is lost. The RS registers are updated under all
022697 21/48
DS2153Q
conditions. Their validity should be qualified by checking for synchronization at the CAS level. In CCS signaling mode, RS1 to RS16 can also be used to extract
informed when the signaling registers have been loaded
with data. The user has 2 ms to retrieve the data before
it is lost.
signaling information. Via the SR2.7 bit, the user will be
TS1 TO TS16: TRANSMIT SIGNALING REGISTERS (Address=40 to 4F Hex)
Each Transmit Signaling Register (TS1 to TS16) contains the CAS bits for two timeslots that will be inserted
into the outgoing stream if enabled to do so via TCR1.5.
On multiframe boundaries, the DS2153Q will load the
values present in the Transmit Signaling Register into
an outgoing signaling shift register that is internal to the
device. The user can utilize the Transmit Multiframe bit
in Status Register 2 (SR2.5) to know when to update the
signaling bits. The bit will be set every 2 ms and the user
has 2 ms to update the TSR’s before the old data will be
retransmitted.
022697 22/48
The TS1 register is special because it contains the CAS
multiframe alignment word in its upper nibble. The
upper nibble must always be set to 0000 or else the terminal at the far end will lose multiframe synchronization.
If the user wishes to transmit a multiframe alarm to the
far end, then the TS1.2 bit should be set to a one. If no
alarm is to be transmitted, then the TS1.2 bit should be
cleared. The three remaining bits in TS1 are the spare
bits. If they are not used, they should be set to one. In
CCS signaling mode, TS1 to TS16 can also be used to
insert signaling information. Via the SR2.5 bit, the user
DS2153Q
will be informed when the signaling registers need to be
loaded with data. The user has 2 ms to load the data
before the old data will be retransmitted. Via the
CCR3.6 bit, the user has the option to use the Transmit
Channel Blocking Registers (TCBRs) to determine on a
channel by channel basis, which signaling bits are to be
inserted via the TSRs (the corresponding bit in the
TCBRs=1) and which are to be sourced from the TSER
pin (the corresponding bit in the TCBRs=0). See the
Transmit Data Flow diagram in Section 13 for more
details.
8.0 TRANSMIT IDLE REGISTERS
There is a set of five registers in the DS2153Q that can
be used to custom tailor the data that is to be transmitted
onto the E1 line, on a channel by channel basis. Each of
the 32 E1 channels can be forced to have a user defined
idle code inserted into them.
TIR1/TIR2/TIR3/TIR4: TRANSMIT IDLE REGISTERS (Address=26 to 29 Hex)
If CCR3.5=1, then a zero in the TIRs implies that channel data is to be sourced from TSER and a one implies that
channel data is to be sourced from the RSER pin.
TIDR7TIDR.7MSB of the Idle Code
TIDR0TIDR.0LSB of the Idle Code
Each of the bit positions in the Transmit Idle Registers
(TIR1/TIR2/TIR3/TIR4) represent a timeslot in the outgoing frame. When these bits are set to a one, the corresponding channel will transmit the Idle Code contained
in the Transmit Idle Definition Register (TIDR). In the
TIDR, the MSB is transmitted first. Via the CCR3.5 bit,
the user has the option to use the TIRs to determine on a
channel by channel basis, if data from the RSER pin
should be substituted for data from the TSER pin. In this
mode, if the corresponding bit in the TIRs is set to one,
then data will be sourced from the RSER pin. If the corresponding bit in the TIRs is set to zero, then data for
that channel will sourced from the TSER pin. See the
Transmit Data Flow diagram in Section 13 for more
details.
022697 23/48
DS2153Q
9.0 CLOCK BLOCKING REGISTERS
The Receive Channel Blocking Registers
(RCBR1/RCBR2/RCBR3/RCBR4) and the Transmit
Channel Blocking Registers (TCBR1/TCBR2/TCBR3/
TCBR4) control the RCHBLK and TCHBLK pins
respectively. The RCHBLK and TCHCLK pins are user
programmable outputs that can be forced either high or
low during individual channels. These outputs can be
used to block clocks to a USART or LAPD controller in
ISDN–PRI applications. When the appropriate bits are
set to a one, the RCHBLK and TCHCLK pins will be held
high during the entire corresponding channel time. See
the timing in Section 13 for an example. The TCBRs
have alternate mode of use. Via the CCR3.6 bit, the
user has the option to use the TCBRs to determine on a
channel by channel basis, which signaling bits are to be
inserted via the TSRs (the corresponding bit in the
TCBRs=1) and which are to be sourced from the TSER
pin (the corresponding bit in the TCBR=0). See the
Transmit Data Flow diagram in Section 13 for more
details.
0=force the TCHBLK pin to remain low during this channel time
CH1TCBR1.01=force the TCHBLK pin high during this channel time
TCBR1 (22)
TCBR2 (23)
TCBR3 (24)
TCBR4 (25)
NOTE:
If CCR3.6=1, then a zero in the TCBRs implies that signaling data is to be sourced from TSER and a one implies that
signaling data for that channel is to be sourced from the Transmit Signaling (TS) registers. See definition below.
022697 24/48
DS2153Q
TCBR1/TCBR2/TCBR3/TCBR4: DEFINITION WHEN CCR3.6 = 1
* = CH1 and CH17 should be set to one to allow the internal TS1 register to create the CAS Multiframe Alignment Word
and Spare/Remote Alarm bits.
CH4CH19CH3CH18CH2CH17*CH1*
TCBR1
TCBR2
TCBR3
TCBR4
10.0 ELASTIC STORE OPERATION
The DS2153Q has an onboard two frame (512 bits)
elastic store. This elastic store can be enabled via
RCR2.1. If the elastic store is enabled (RCR2.1=1),
then the user must provide either a 1.544 MHz
(RCR2.2=0) or 2.048 MHz (RCR2.2=1) clock at the
SYSCLK pin. If the elastic store is enabled, then the
user has the option of either providing a frame sync at
the RSYNC pin (RCR1.5=1) or having the RSYNC pin
provide a pulse on frame or multiframe boundaries
(RCR1.5=0). If the user wishes to obtain pulses at the
frame boundary , then RCR1.6 must be set to zero and if
the user wishes to have pulses occur at the multiframe
boundary , then RCR1.6 must be set to one. If the user
selects to apply a 1.544 MHz clock to the SYSCLK pin,
then every fourth channel will be deleted and the F–bit
position inserted (forced to one). Hence channels 1, 5,
9, 13, 17, 21, 25, and 29 (timeslots 0, 4, 8, 12, 16, 20, 24,
and 28) will be deleted. Also, in 1.544 MHz applications,
the RCHBLK output will not be active in channels 25
through 32 (or in other words, RCBR4 is not active).
See Section 13 for more details. If the 512–bit elastic
buffer either fills or empties, a controlled slip will occur . If
the buffer empties, then a full frame of data (256 bits) will
be repeated at RSER and the SR1.4 and RIR.3 bits will
be set to a one. If the buffer fills, then a full frame of data
will be deleted and the SR1.4 and RIR.4 bits will be set to
a one.
11.0 ADDITIONAL (Sa) AND
INTERNATIONAL (Si) BIT OPERATION
The DS2153Q provides for access to both the Additional (Sa) and International (Si) bits. On the receive
side, the RAF and RNAF registers will always report the
data as it received in the Additional and International bit
locations. The RAF and RNAF registers are updated
with the setting of the Receive Align Frame bit in Status
Register 2 (SR2.6). The host can use the SR2.6 bit to
know when to read the RAF and RNAF registers. It has
250 µs to retrieve the data before it is lost.
On the transmit side, data is sampled from the TAF and
TNAF registers with the setting of the Transmit Align
Frame bit in Status Register 2 (SR2.3). The host can
use the SR2.3 bit to know when to update the T AF and
TNAF registers. It has 250 µs to update the data or else
the old data will be retransmitted. Data in the Si bit position will be overwritten if either the DS2153Q is programmed: (1) to source the Si bits from the TSER pin,
(2) in the CRC4 mode, or (3) have automatic E–bit insertion enabled. Data in the Sa bit position will be overwritten if any of the TCR2.3 to TCR2.7 bits are set to one.
Please see the register descriptions for TCR1 and
TCR2 and the Transmit Data Flow diagram in Section
13 for more details.
0RAF .6Frame Alignment Signal Bit.
0RAF .5Frame Alignment Signal Bit.
1RAF .4Frame Alignment Signal Bit.
1RAF .3Frame Alignment Signal Bit.
0RAF .2Frame Alignment Signal Bit.
1RAF .1Frame Alignment Signal Bit.
1RAF .0Frame Alignment Signal Bit.
ARNAF.5Remote Alarm.
Sa4RNAF.4Additional Bit 4.
Sa5RNAF.3Additional Bit 5.
Sa6RNAF.2Additional Bit 6.
Sa7RNAF.1Additional Bit 7.
Sa8RNAF.0Additional Bit 8.
ATNAF.5Remote Alarm.
Sa4TNAF.4Additional Bit 4.
Sa5TNAF.3Additional Bit 5.
Sa6TNAF.2Additional Bit 6.
Sa7TNAF.1Additional Bit 7.
Sa8TNAF.0Additional Bit 8.
DS2153Q
12.0 LINE INTERFACE FUNCTIONS
The line interface function in the DS2153Q contains
three sections; (1) the receiver which handles clock and
and drives the E1 line, and (3) the jitter attenuator . Each
of the these three sections is controlled by the Line Interface Control Register (LICR) which is described below.
data recovery, (2) the transmitter which waveshapes
LICR: LINE INTERFACE CONTROL REGISTER (Address=18 Hex)
(MSB)(LSB)
L2L1L0EGLJASJABDSDJATPD
SYMBOLPOSITIONNAME AND DESCRIPTION
LB2LICR.7Line Build Out Bit 2. Transmit waveshape setting; see Table 12.2.
LB1LICR.6Line Build Out Bit 1. Transmit waveshape setting; see Table 12.2.
LB0LICR.5Line Build Out Bit 0. Transmit waveshape setting; see Table 12.2.
0=normal transmitter operation
1=powers down the transmitter and 3–states the TTIP and TRING pins
12.1 Receive Clock and Data Recovery
The DS2153Q contains a digital clock recovery system.
See the DS2153Q Block Diagram in Section 1 and Figure 12.1 for more details. The DS2153Q couples to the
receive E1 shielded twisted pair or COAX via a 1:1
transformer. See T able 12.3 for transformer details. The
DS2153Q automatically adjusts to the E1 signal being
received at the RTIP and RRING pins and can handle
E1 twisted pair cables of 0.6 mm (22 AWG) from 0 to 1.5
KM in length. The crystal attached at the XTAL1 and
XTAL2 pins is multiplied by four via an internal PLL and
fed to the clock recovery system. The clock recovery
system uses both edges of the clock from the PLL circuit
to form a 32 times oversampler which is used to recover
the clock and data. This oversampling technique offers
outstanding jitter tolerance (see Figure 12.2).
Normally, the clock that is output at the RCLK pin is the
recovered clock from the E1 AMI/HDB3 waveform pres-
SOURCE OF RCLK UPON RCL Table 12–1
ACLKI PRESENT?RECEIVE SIDE JITTER
ATTENUATOR
yesACLKI via the jitter attenuatorACLKI
nocentered crystalTCLK via the jitter attenuator
ented at the RTIP and RRING inputs. When no AMI signal is present at RTIP and RRING, a Receive Carrier
Loss (RCL) condition will occur and the RCLK can be
sourced from either the ACLKI pin or from the crystal
attached to the XT AL1 and XTAL2 pins. The DS2153Q
will sense the ACLKI pin to determine if a clock is present. If no clock is applied to the ACLKI pin, then it should
be tied to RVSS to prevent the device from falsely sensing a clock. See Table 12.1. If the jitter attenuator is
either placed in the transmit path or is disabled, the
RCLK output can exhibit short high cycles of the clock.
This is due to the highly oversampled digital clock recovery circuitry. If the jitter attenuator is placed in the
receive path (as is the case in most applications), the jitter attenuator restores the RCLK to being close to 50%
duty cycle. Please see the Receive AC Timing Characteristics in Section 14 for more details.
TRANSMIT SIDE JITTER
ATTENUATOR
12.2 Transmit Waveshaping and Line Driving
The DS2153Q uses a set of laser–trimmed delay lines
along with a precision Digital–to–Analog Converter
(DAC) to create the waveforms that are transmitted onto
the E1 line. The waveforms created by the DS2153Q
meet the ITU specifications. See Figure 12.3. The user
022697 28/48
will select which waveform is to be generated by properly programming the L2/L1/L0 bits in the Line Interface
Control Register (LICR). The DS2153Q can set set up
in a number of various configurations depending on the
application. See Table 12.2 and Figure 12.1.
Due to the nature of the design of the transmitter in the
DS2153Q, very little jitter (less then 0.00 5UIpp broadband from 10 Hz to 100 KHz) is added to the jitter present on TCLK. Also, the waveforms that they create are
independent of the duty cycle of TCLK. The transmitter
twisted pair or COAX via a 1:1.15 or 1:1.36 step up
transformer as shown in Figure 12.1. In order for the
devices to create the proper wavefroms, this transformer used must meet the specifications listed in
Table 12.3.
in the DS2153Q couples to the E1 transmit shielded
TRANSFORMER SPECIFICATIONS Table 12–3
SPECIFICATIONRECOMMENDED VALUE
Turns Ratio1:1 (receive) and 1:1.15 or 1:1.36 (transmit) ±5%
Primary Inductance600 µH minimum
Leakage Inductance1.0 µH maximum
Interwinding Capacitance60 pF maximum
DC Resistance1.2 ohms maximum
12.3 Jitter Attenuator
The DS2153Q contains an onboard jitter attenuator that
can be set to a depth of either 32 or 128 bits via the
JABDS bit in the Line Interface Control Register (LICR).
The 128–bit mode is used in applications where large
excursions of wander are expected. The 32–bit mode is
used in delay sensitive applications. The characteristics of the attenuation are shown in Figure 12.4. The jitter attenuator can be placed in either the receive path or
the transmit path by appropriately setting or clearing the
JAS bit in the LICR. Also, the jitter attenuator can be disabled (in effect, removed) by setting the DJA bit in the
LICR. In order for the jitter attenuator to operate properly, a crystal with the specifications listed in Table 12.4
below must be connected to the XTAL1 and XT AL2 pins.
The jitter attenuator divides the clock provided by the
8.192 MHz crystal at the XTAL1 and XTAL2 pins by to
create an output clock that contains very little jitter.
Onboard circuitry will pull the crystal (by switching in or
out load capacitance) to keep it long term averaged to
the same frequency as the incoming E1 signal. If the
incoming jitter exceeds either 120 UIpp (buffer depth is
128–bits) or 28 UIpp (buffer depth is 32–bits), then the
022697 29/48
DS2153Q
DS2153Q will divide the attached crystal by either 3.5 or
4.5 instead of the normal 4 to keep the buffer from over-
also sets the Jitter Attenuator Limit Trip (JAL T) bit in the
Receive Information Register (RIR.5).
flowing. When the device divides by either 3.5 or 4.5, it
5. See the separate Application Note for details on how to construct a protected interface.
022697 30/48
DS2153Q JITTER TOLERANCE Figure 12–2
1K
100
40
10
DS2153Q
TOLERANCE
DS2153Q
UNIT INTERVALS (Ulpp)
1
0.1
MINIMUM TOLERANCE
202.4K18K
101001K10K100K1
1.5
LEVEL AS PER
ITU G.823
FREQUENCY (Hz)
DS2153Q TRANSMIT WAVEFORM TEMPLATE Figure 12–3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
SCALED AMPLITUDE
0.3
0.2
0.1
(in 75 ohm systems, 1.0 on the scale=2.37Vpeak
in 120 ohm systems, 1.0 on the scale=3.00Vpeak)
0
–0.1
–0.2
194 ns
219 ns
0.2
269 ns
G.703
TEMPLATE
–250–200–150–100–50050100150200250
TIME (ns)
022697 31/48
DS2153Q
DS2153Q JITTER ATTENUATION Figure 12–4
0 dB
ITU G.7XX
PROHIBITED AREA
–20 dB
–40 dB
JITTER ATTENUA TION (dB)
–60 dB
1101001K10K100K
FREQUENCY (Hz)
13.0 TIMING DIAGRAMS/SYNCHRONIZATION FLOWCHART/TRANSMIT DATA FLOW
DIAGRAM
RECEIVE SIDE TIMING Figure 13–1
FRAME#
RSYNC
RSYNC
RLCLK
RLINK
1
2
3
4
15 16 123 4 567 8 9 10 11 12 13 14 15
1612345614
NOTES:
1. RSYNC in the frame mode (RCR1.6=0).
2. RSYNC in the multiframe mode (RCR1.6=1).
3. RLCLK is programmed to output just the Sa4 bit.
4. RLINK will always output all five Sa bits as well as the rest of the receive data stream.
5. This diagram assumes the CAS MF begins with the FAS word.
022697 32/48
RECEIVE SIDE BOUNDARY TIMING (WITH ELASTIC STORES DISABLED) Figure 13–2
RCLK
DS2153Q
RSER
RSYNC
RCHCLK
RCHBLK
RLINK
RLCLK
RLCLK
RLCLK
1
2
3
4
CHANNEL 32CHANNEL 1CHANNEL 2
LSBMSBMSB
Si1A Sa4 Sa5 Sa6 Sa7 Sa8
NOTES:
1. RCHBLK is programmed to block channel 2.
2. RLINK is programmed to output the Sa4 bits.
3. RLINK is programmed to output the SA4 and SA8 bits.
4. RLINK is programmed to output the Sa5 and Sa7 bits.
5. Shown is a non–align frame boundary.
Sa4 Sa5 Sa6 Sa7 Sa8
022697 33/48
DS2153Q
1.544 MHz BOUNDARY TIMING WITH ELASTIC STORE(S) ENABLED Figure 13–3
SYSCLK
1
RSER
TSER
RSYNC
RSYNC
RCHCLK
RCHBLK
,
2
3
4
LSB MSBLSBMSBF
CHANNEL 24/32CHANNEL 1/2CHANNEL 23/31
NOTES:
1. Data from the E1 channels 1, 5, 9, 13, 17, 21, 25, and 29 is dropped (channel 2 from the E1 link is mapped to
channel 1 of the T1 link, etc.) and the F–bit position is added (forced to one).
2. RSYNC is in the output mode (RCR1.5=0).
3. RSYNC is in the input mode (RCR1.5=1).
4. RCHBLK is programmed to block channel 24.
2.048 MHz BOUNDARY TIMING WITH ELASTIC STORE(S) ENABLED Figure 13–4
SYSCLK
RSER,
TSER
RSYNC
RSYNC
RCHCLK
RCHBLK
LSB MSBLSB
1
2
3
CHANNEL 32CHANNEL 1CHANNEL 31
NOTES:
1. RSYNC is in the output mode (RCR1.5=0).
2. RSYNC is in the input mode (RCR1.5=1).
3. RCHBLK is programmed to block channel 1.
022697 34/48
TRANSMIT SIDE TIMING Figure 13–5
DS2153Q
FRAME#
TSYNC
TSYNC
3
TCLK
TLINK
1
2
3
15 16 123 4 567 8 9 10 11 12 13 14 15
1612345614
NOTES:
1. TSYNC in the frame mode (TCR1.1=0).
2. TSYNC in the multiframe mode (TCR1.1=1).
3. TLINK is programmed to source only the Sa4 bit.
4. This diagram assumbes both the CAS MF and the CRC4 begin with the align frame.
022697 35/48
DS2153Q
TRANSMIT SIDE BOUNDARY TIMING Figure 13–6
TCLK
TSER
TSYNC
TSYNC
TCHCLK
TCHBLK
TLCLK
1
2
3
4
LSB Si1ASa4 Sa5 Sa6 Sa7 Sa8 MSBMSBLSB
CHANNEL 2CHANNEL 1
TLINK
TLCLK
TLINK
4
5
5
Don’t Care
Don’t Care
Don’t CareDon’t Care
NOTES:
1. TSYNC is in the input mode (TCR1.0=0).
2. TSYNC is in the output mode (TCR1.0=1).
3. TCHBLK is programmed to block channel 2.
4. TLINK is programmed to source the Sa4 bits.
5. TLINK is programmed to source the Sa7 and Sa8 bits.
6. Shown is a non–align frame boundary.
7. See Figures 13.3 and 13.4 for details on timing with the transmit side elastic store enabled.
1. RCHBLK or TCHBLK is programmed to pulse high during timeslots 1 to 15, 17 to 25, and during bit 1 of timeslot 26.
022697 37/48
DS2153Q
DS2153Q SYNCHRONIZATION FLOWCHART Figure 13–8
POWER UP
RLOS=1
RLOS=1
RESYNC IF
RCR1.1=0
INCREMENT CRC4
SYNC COUNTER;
CRC4SA=0
SET FASRC
(RIR.1)
CRC4 RESYNC
CRITERIA MET
(RIR.2)
CAS RESYNC
CRITERIA MET;
SET CASRC
(RIR.0)
8 MS
TIME
OUT
FAS RESYNC
CRITERIA MET
CHECK FOR >=915
OUT OF 1000 CRC
WORD ERRORS
CHECK FOR CAS
MF WORD ERROR
CRC4 MULTIFRAME
SEARCH (IF ENABLED
VIA CCR.0)
CRC4SA=1
CRC4 SYNC CRITERIA
MET; CRC4SA=0;
RESET CRC4 SYNC
COUNTER
CHECK FOR FAS
FRAMING ERROR
(DEPENDS ON
RCR1.2)
IF CRC4 IS ON
(CCR1.0=1)
IF CAS IS ON
(CCR1.3=0)
FAS SYNC
CRITERIA MET
FASSA=0
SYNC DECLARED
RLOS=0
CAS MULTIFRAME
SEARCH (IF ENABLED
VIA CCR1.3)
CASSA=1
CAS SYNC
CRITERIA MET
CASSA=0
022697 38/48
DS2153Q TRANSMIT DATA FLOW Figure 13–9
DS2153Q
TCBR1/2/3/4
CCR3.6
TAF
TNAF
0
TIMESLOT 0
PASS–THROUGH
(TCR1.6)
1
Si BIT INSERTION
CONTROL
(TCR1.3)
CRC4 MULTIFRAME
ALIGNMENT WORD
GENERATION (CCR1.4)
TCR1.5
KEY
= REGISTER
= DEVICE PIN
= SELECTOR
TSER
1
0
0
E–BIT GENERATION
(TCR2.1)
Sa BIT INSERTION
CONTROL (TCR2.3
RECEIVE SIDE
CRC4 ERROR
DETECTOR
1
0
THRU TCR2.7)
AUTO REMOTE
ALARM GENERATION
(CCR2.4)
IDLE CODE/CHANNEL
INSERTION CONTROL
TLINK
1
0
1
VIA TIR1/2/3/4
0
SIGNALING BIT
INSERTION CONTROL
TIDR
01
TIR FUNCTION SELECT
TS1 TO TS16
TRANSMIT SIGNALLING
1
0
CRC4 ENABLE
(CCR1.4)
0
TRANSMIT UNFRAMED
ALL ONES (TCR1.4) OR
AUTO AIS (CCR2.5)
RSER
(note 1)
(CCR3.5)
0
ALL ONES
(TCR1.2)
CODE WORD
GENERATION
1
GENERATION
1
AIS
GENERATION
1
AIS
NOTE:
1. TCLK must be tied to RCLK (or SYSCLK if the elastic store is enabled) and
TSYNC must be tied to RSYNC for data to be properly sourced from RSER.
TTIP,
TRING
022697 39/48
DS2153Q
ABSOLUTE MAXIMUM RATINGS*
Voltage on Any Pin Relative to Ground–1.0V to +7.0V
Operating Temperature0°C to 70°C
Storage Temperature–55°C to +125°C
Soldering Temperature260°C for 10 seconds
* This is a stress rating only and functional operation of the device at these or any other conditions above those
indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods of time may affect reliability.
(–40°C to +85°C for DS2153QN)
RECOMMENDED DC OPERATION CONDITIONS(0°C to 70°C)
(–40°C to +85°C for DS2153QN)
PARAMETERSYMBOLMINTYPMAXUNITSNOTES
Logic 1V
Logic 0V
Supply for DS2153QV
Supply for DS2153QNV
DD
DD
IH
IL
2.0V
–0.3+0.8V
4.755.25V1
4.805.25V1
+0.3V
DD
CAPACITANCE(tA=25°C)
PARAMETERSYMBOLMINTYPMAXUNITSNOTES
Input CapacitanceC
Output CapacitanceC
IN
OUT
5pF
7pF
DC CHARACTERISTICS(0°C to 70°C; VDD=5V + 5%)
(–40°C to +85°C; V
PARAMETERSYMBOLMINTYPMAXUNITSNOTES
Supply Current @ 5VI
Input LeakageI
Output LeakageI
Output Current (2.4V)I
Output Current (0.4V)I
DD
LO
OH
OL
IL
–1.0+1.0µA3
–1.0mA
+4.0mA
60mA2
=5V +5%/–4% for DS2153QN)
DD
1.0µA4
NOTES:
1. Applies to RVDD, TVDD, and DVDD.
2. TCLK=2.048 MHz.
3. 0.0V < V
4. Applies to INT1
022697 40/48
< VDD.
IN
and INT2 when 3–stated.
DS2153Q
AC CHARACTERISTICS – PARALLEL PORT(0°C to 70°C; VDD=5V + 5%)
(–40°C to +85°C; V
PARAMETERSYMBOLMINTYPMAXUNITSNOTES
Cycle Timet
CYC
Pulse Width, DS Low or RD HighPW
Pulse Width, DS High or RD LowPW
Input Rise/Fall TimestR, t
R/W Hold Timet
R/W Setup Time Before DS Hight
CS Setup Time Before DS, WR or
active
RD
CS Hold Timet
Read Data Hold Timet
Write Data Hold Timet
Muxed Address Valid to AS or
ALE fall
Muxed Address Hold Timet
Delay Time DS, WR or RD to AS
or ALE Rise
RWH
RWS
t
CS
CH
DHR
DHW
t
ASL
AHL
t
ASD
Pulse Width AS or ALE HighPW
Delay Time, AS or ALE to DS,
or RD
WR
Output Data Delay Time from DS
or RD
Data Setup Timet
t
ASED
t
DDR
DSW
EL
EH
F
ASH
250ns
150ns
100ns
10ns
50ns
20ns
0ns
1050ns
0ns
20ns
10ns
25ns
40ns
20ns
20100ns
80ns
=5V +5%/–4% for DS2153QN)
DD
30ns
022697 41/48
DS2153Q
INTEL READ BUS AC TIMING Figure 14–1
PW
ALE
t
ASD
ASH
WR
t
ASD
PW
RD
EL
CS
t
ASL
AD0-AD7
INTEL WRITE BUS AC TIMING Figure 14–2
PW
ALE
t
ASD
ASH
t
t
AHL
t
ASED
CS
t
t
CYC
CYC
t
DDR
PW
EH
t
CH
t
DHR
RD
WR
CS
AD0-AD7
022697 42/48
t
ASD
t
ASL
PW
t
ASED
PW
EL
t
CS
t
AHL
EH
t
CH
t
DHW
t
DSW
MOTOROLA BUS AC TIMING Figure 14–3
PW
ASH
AS
DS
R/W
t
ASD
PW
EL
t
ASED
t
RWS
t
CYC
PW
DS2153Q
EH
t
RWH
AD0-AD7
(READ)
CS
AD0-AD7
(WRITE)
t
ASL
t
ASL
t
t
AHL
AHL
t
DDR
t
CS
t
DSW
t
DHR
t
CH
t
DHW
022697 43/48
DS2153Q
AC CHARACTERISTICS – RECEIVE SIDE(0°C to 70°C; VDD=5V ± 5%)
(–40°C to +85°C; V
PARAMETERSYMBOLMINTYPMAXUNITSNOTES
ALCKI/RCLK Periodt
RCLK Pulse Widtht
RCLK Pulse Widtht
CP
CH
t
CH
t
SYSCLK Periodt
t
SYSCLK Pulse Widtht
RSYNC Set Up to SYSCLK Falling
RSYNC Pulse Widtht
t
SH
t
SU
PW
SYSCLK Rise/Fall TimestR, t
Delay RCLK or SYSCLK to RSER
Valid
Delay RCLK or SYSCLK to
t
DD
t
RCHCLK
Delay RCLK or SYSCLK to
t
RCHBLK
Delay RCLK or SYSCLK to
t
RSYNC
Delay RCLK to RLCLKt
Delay RCLK to RLINK Validt
CL
CL
SP
SP
SL
D1
D2
D3
D4
D5
180
180
90
200
50
50
25tSH–5ns
50ns
F
488ns
244
244
244
244
648
488
=5V +5%/–4% for DS2153QN)
DD
ns
ns
ns
ns
ns
ns
ns
25ns
70ns
50ns
50ns
50ns
50ns
50ns
1
2
3
4
NOTES:
1. Jitter attenuator enabled in the receive side path.
2. Jitter attenuator disabled or enabled in the transmit path.
3. SYSCLK=1.544 MHz.
4. SYSCLK=2.048 MHz.
022697 44/48
RECEIVE SIDE AC TIMING Figure 14–4
RCLK
SYSCLK
RSER
RCHCLK
RCHBLK
RSYNC
RSYNC
t
R
1
2
t
F
t
DD
t
D1
t
D3
t
SU
MSB OF
CHANNEL 1
t
D2
DS2153Q
t
CP
t
CL
t
SL
t
PW
t
CH
t
SH
t
SP
t
D4
3
RLCLK
t
D5
3
RLINK
NOTES:
1. RSYNC is in the output mode (RCR1.5=0).
2. RSYNC is in the input mode (RCR1.5=1).
3. RLCLK and RLINK only have a timing relationship to RCLK; no timing relationship between RLCLK/RLINK
and RSYNC is implied.
4. RCLK can exhibit a short high time if the jitter attenuator is either disabled or in the transmit path.
022697 45/48
DS2153Q
AC CHARACTERISTICS – TRANSMIT SIDE(0°C to 70°C; VDD=5V + 5%)
(–40°C to +85°C; V
PARAMETERSYMBOLMINTYPMAXUNITSNOTES
TCLK Periodt
TCLK Pulse Widtht
TSER, TLINK Set Up to TCLK
Falling
TSER, TLINK Hold from TCLK
Falling
TSYNC Setup to TCLK Fallingt
TSYNC Pulse Widtht
t
t
t
CH
SU
HD
HD
PW
TCLK Rise/Fall TimestR, t
Delay TCLK to TCHCLKt
Delay TCLK to TCHBLKt
Delay TCLK to TSYNCt
Delay TCLK to TLCLKt
CL
D1
D2
D3
D4
P
75
75
25ns1
25ns1
25tCH–5ns
25ns
F
488ns
=5V +5%/–4% for DS2153QN)
DD
ns
ns
25ns
50ns
50ns
50ns
50ns
NOTES:
1. If the transmit side elastic store is enabled,then TSER is sampled on the falling edge of SYSCLK and the
parameters tSU and tHD still apply.
022697 46/48
DS2153Q
TRANSMIT SIDE AC TIMING Figure 14–5
t
F
t
D1
t
D3
t
D4
t
TCLK
4
TSER
TCHCLK
TCHBLK
TSYNC
TSYNC
TLCLK
TLINK
t
R
1
2
3
3
t
P
t
CL
t
CH
MSBLSB
t
HD
t
SU
t
D2
t
t
SU
SU
PW
t
HD
NOTES:
1. TSYNC is in the output mode (TCR1.0=1).
2. TSYNC is in the input mode (TCR1.0=0).
3. No timing relationship between TSYNC and TLCLK/TLINK is implied.
4. TSER is sampled on the falling edge of SYSCLK if the transmit side elastic store is enabled.
022697 47/48
DS2153Q
DS2153Q E1 SINGLE–CHIP TRANSCEIVER 44–PIN PLCC
E
E1
B
N
1
.075 MAX
D1
D
NOTE 1
CH1
.150
MAX
e1
E2
NOTE1: PIN 1 IDENTIFIER TO BE LOCA TED IN ZONE INDICATED.
INCHES
DIMMINMAX
A0.1650.180
A10.0900.120
A20.020–
B0.0260.033
B10.0130.021
C0.0090.012
CH10.0420.048
D0.6850.695
D10.6500.656
D20.5900.630
E0.6850.695
E10.6500.656
E20.5900.630
e10.050 BSC
N44–
D2
B1
C
A
A1A2
022697 48/48
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