XRT91L33A
17
STS-12/STS-3 MULTIRATE CLOCK AND DATA RECOVERY UNIT
6.0 RESAMPLED DATA AND CLOCK OUTPUTS
It is recommended that the retimed data output be captured with the rising edge of the clock output as shown in
Figure 14. Data valid time is longer for OC-3/STS-3 mode of operation than that of OC-12/STS-12. Data valid
time before the output clock’s rising edge is the available setup time (t
SU
), while the data valid time after the
clock’s rising edge is the available hold time (t
H
).
FIGURE 14. OUTPUT DATA AND CLOCK AFTER RESAMPLING
TABLE 11: OUTPUT TIMING
SYMBOL PARAMETER MINIMUM MAXIMUM UNIT CONDITION
t
SU
Available setup time 450 ps STS-12 operation (622.08 MHz)
2.0 ns STS-3 operation (155.52 MHz)
t
H
Available hold time 650 ps STS-12 operation (622.08 MHz)
3.0 ns STS-3 operation (155.52 MHz)
t
H
t
SU
RXDOP/N
RXCLKOP/N
