XRT91L31 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT91L31' PDF : 41 Pages View PDF
XRT91L31
REV. 1.0.2
STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
3.2 Transmit Parallel Data Input Timing
When applying parallel data input to the transmitter, the setup and hold times should be followed as shown in
Figure 12, Table 12 and Table 13.
FIGURE 12. TRANSMIT PARALLEL INPUT TIMING
Transmit Parallel
Clock driven by
XRT91L31 Device
TXPCLK_IO
TXDI[7:0]
Transmit Parallel Clock Output
tTXPCLK_IO
tTXDI_SU
tTXDI_HD
TABLE 12: TRANSMIT PARALLEL DATA INPUT TIMING (STS-12/STM-4 OPERATION)
SYMBOL
tTXPCLK_IO
tTXDI_SU
tTXDI_HD
PARAMETER
Transmit Clock Output period
Transmit data setup time with respect to TXPCLK_IO
Transmit data hold time with respect to TXPCLK_IO
MIN
TYP
12.86
2.0
1.0
MAX
UNITS
ns
ns
ns
TABLE 13: TRANSMIT PARALLEL DATA INPUT TIMING (STS-3/STM-1 OPERATION).
SYMBOL
tTXPCLK_IO
tTXDI_SU
tTXDI_HD
PARAMETER
Transmit Clock Output period
Transmit data setup time with respect to TXPCLK_IO
Transmit data hold time with respect to TXPCLK_IO
MIN
TYP
51.44
2.0
1.0
MAX
UNITS
ns
ns
ns
25
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