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XRT91L31 Datasheet(PDF) 4 Page - Exar Corporation

Part # XRT91L31
Description  STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT91L31 Datasheet(HTML) 4 Page - Exar Corporation

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XRT91L31
4
STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
REV. 1.0.2
GENERAL DESCRIPTION .................................................................................................1
APPLICATIONS ...........................................................................................................................................1
FIGURE 1. BLOCK DIAGRAM OF XRT91L31 ...................................................................................................................................... 1
FEATURES
......................................................................................................................................................2
FIGURE 2. 64 QFP PIN OUT OF THE XRT91L31 (TOP VIEW)............................................................................................................ 3
TABLE 1: ORDERING INFORMATION ................................................................................................................................................... 3
PIN DESCRIPTIONS ..........................................................................................................6
.....................................................................................................................................................................6
TABLE 2: HARDWARE CONTROL ....................................................................................................................................................... 6
TRANSMITTER SECTION ..................................................................................................................................9
RECEIVER SECTION......................................................................................................................................11
POWER AND GROUND ..................................................................................................................................12
1.0 FUNCTIONAL DESCRIPTION .............................................................................................................14
1.1 STS-12/STM-4 AND STS-3/STM-1 MODE OF OPERATION ......................................................................... 14
1.2 CLOCK INPUT REFERENCE FOR CLOCK MULTIPLIER (SYNTHESIZER) UNIT ...................................... 14
TABLE 3: CMU REFERENCE FREQUENCY OPTIONS (DIFFERENTIAL OR SINGLE-ENDED) ................................................................... 14
1.3 DATA LATENCY ............................................................................................................................................. 14
TABLE 4: DATA INGRESS TO DATA EGRESS LATENCY ....................................................................................................................... 14
2.0 RECEIVE SECTION .............................................................................................................................15
2.1 RECEIVE SERIAL INPUT ............................................................................................................................... 15
FIGURE 3. RECEIVE SERIAL INPUT INTERFACE BLOCK ..................................................................................................................... 15
2.2 RECIEVE SERIAL DATA INPUT TIMING ...................................................................................................... 16
FIGURE 4. RECEIVE HIGH-SPEED SERIAL DATA INPUT TIMING DIAGRAM .......................................................................................... 16
TABLE 5: RECEIVE HIGH-SPEED SERIAL DATA INPUT TIMING (STS-12/STM-4 OPERATION) ............................................................. 16
TABLE 6: RECEIVE HIGH-SPEED SERIAL DATA INPUT TIMING (STS-3/STM-1 OPERATION) ............................................................... 16
...................................................................................................................................................................16
2.3 RECEIVE CLOCK AND DATA RECOVERY .................................................................................................. 17
TABLE 7: CLOCK DATA RECOVERY UNIT REFERENCE CLOCK SETTINGS ............................................................................................ 17
TABLE 8: CDR AUXREFCLK REFERENCE FREQUENCY REQUIREMENT FOR CLOCK AND DATA RECOVERY ..................................... 17
2.3.1 INTERNAL CLOCK AND DATA RECOVERY BYPASS ............................................................................................ 17
FIGURE 5. INTERNAL CLOCK AND DATA RECOVERY BYPASS............................................................................................................ 18
2.4 EXTERNAL RECEIVE LOOP FILTER CAPACITORS ................................................................................... 19
FIGURE 6. EXTERNAL LOOP FILTERS .............................................................................................................................................. 19
2.5 LOSS OF SIGNAL .......................................................................................................................................... 19
FIGURE 7. LOS DECLARATION CIRCUIT .......................................................................................................................................... 19
2.6 SONET FRAME BOUNDARY DETECTION AND BYTE ALIGNMENT RECOVERY .................................... 20
2.7 RECEIVE SERIAL INPUT TO PARALLEL OUTPUT (SIPO) ......................................................................... 20
FIGURE 8. SIMPLIFIED BLOCK DIAGRAM OF SIPO ...........................................................................................................................20
2.8 RECEIVE PARALLEL OUTPUT INTERFACE ............................................................................................... 21
FIGURE 9. RECEIVE PARALLEL OUTPUT INTERFACE BLOCK ............................................................................................................. 21
2.9 DISABLE PARALLEL RECEIVE DATA OUTPUT UPON LOS ..................................................................... 21
2.10 RECEIVE PARALLEL DATA OUTPUT TIMING .......................................................................................... 22
FIGURE 10. RECEIVE PARALLEL OUTPUT TIMING ............................................................................................................................ 22
TABLE 9: RECEIVE PARALLEL DATA OUTPUT TIMING (STS-12/STM-4 OPERATION) ......................................................................... 22
TABLE 10: RECEIVE PARALLEL DATA OUTPUT TIMING (STS-3/STM-1 OPERATION) ......................................................................... 22
TABLE 11: PECL AND TTL RECEIVE OUTPUTS TIMING SPECIFICATION ............................................................................................ 23
3.0 TRANSMIT SECTION ..........................................................................................................................24
3.1 TRANSMIT PARALLEL INPUT INTERFACE ................................................................................................. 24
FIGURE 11. TRANSMIT PARALLEL INPUT INTERFACE BLOCK............................................................................................................. 24
3.2 TRANSMIT PARALLEL DATA INPUT TIMING .............................................................................................. 25
FIGURE 12. TRANSMIT PARALLEL INPUT TIMING .............................................................................................................................. 25
TABLE 12: TRANSMIT PARALLEL DATA INPUT TIMING (STS-12/STM-4 OPERATION)......................................................................... 25
...................................................................................................................................................................25
TABLE 13: TRANSMIT PARALLEL DATA INPUT TIMING (STS-3/STM-1 OPERATION)........................................................................... 25
...................................................................................................................................................................25
3.3 ALTERNATE TRANSMIT PARALLEL BUS CLOCK INPUT OPTION .......................................................... 26
FIGURE 13. ALTERNATE TRANSMIT PARALLEL INPUT INTERFACE BLOCK (PARALLEL CLOCK INPUT OPTION) ...................................... 26
3.4 ALTERNATE TRANSMIT PARALLEL DATA INPUT TIMING ....................................................................... 26
FIGURE 14. ALTERNATE TRANSMIT PARALLEL INPUT TIMING............................................................................................................ 26
TABLE 14: ALTERNATE TRANSMIT PARALLEL DATA INPUT TIMING (STS-12/STM-4 OPERATION) ...................................................... 27
...................................................................................................................................................................27


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