Valid Recovered Data Capture Window

The client should monitor the assertion of the PMA's RX_SIGNAL_DETECT and wait for tRX_CR_CEINIT or tRX_CR_NOINIT before deciding to use the true recovered data from PMA CDR block.

Figure 1. CDR Recovered Data Window

Table 1. Recovered Data Valid Window Timing ParametersAll values are preliminary.
Timing Parameters 20b PHY 32b PHY Description
Minimum Maximum Minimum Maximum
tRX_CR_CEINIT (4.447 + 2,496.420/rate1) μs (236.918 + 3,706.110/rate) μs 22.3 μs 117.4 μs Initial time required to lock clock recovery once valid data is received. Final number is TBD.
tRX_CR_NOINIT 1.389 μs 1.622 μs 658 ns 838 ns Time required to lock clock recovery once valid data is received, assuming initial adaptation has been previously completed. Final number is TBD.

1 Rate is in Gbps