Receive Clocks - 1.1 English - PG371

The receive clocks in the ILKNF subsystem are as follows.

rx_serdes_clk[5:0]

Recovered clocks of RX transceiver lanes. For RX lanes configured in Interlaken mode, rx_serdes_clk[0] is used as the transceiver clock. For RX lanes configured in FEC-only mode, rx_serdes_clk[0] is used for both 50G slices of FEC instance 0, rx_serdes_clk[1] is used for both 50G slices of FEC instance 1, and so on.

rx_alt_serdes_clk[5:0]

RX SerDes alternative clocks. For RX lanes configured in Interlaken mode, rx_alt_serdes_clk[0] is used as the alternative transceiver clock. For RX lanes configured in FEC-only mode, rx_alt_serdes_clk[0] is used for both 50G slices of FEC instance 0, rx_alt_serdes_clk[1] is used for both 50G slices of FEC instance 1, and so on. When used, the frequency of rx_alt_serdes_clk[i] is half of rx_serdes_clk[i], i=0 to 5.