Depending on the design of the clocking scheme, it is possible for the RX reset sequence to be completed before the CDR is locked to the incoming data. In this case, the recovered clock might not be stable when RXRESETDONE is asserted. When the RX PCS is used, a single mode reset targeting the RX PCS must be triggered after the recovered clock becomes stable.
Refer to the Versal ACAP data sheets for successful CDR lock-to-data criteria.