ID:18620 TX channel adapter <name> in double data rate transfer mode feeding a 20-bit serializer and with its byte serializer disabled must have its <name> input (tx_coreclkin) fed by an fPLL

CAUSE: The given TX channel adapter's clock input must be fed by an fPLL when in double data rate transfer mode to a 20-bit serializer with to ensure proper operation.

ACTION: Insert an fPLL in the clock path to the given TX channel adapter input port.