22.214.171.124.2. Receiver Byte Reversal
You can enable the RX byte reversal feature in Basic/Custom (Standard PCS), Basic/Custom w/ Rate Match (Standard PCS) and in Standard PCS low latency mode.
To enable this feature, select the Enable RX byte reversal and Enable rx_std_byterev_ena port options. This adds rx_std_byterev_ena. If there is more than one channel in the design, rx_std_byterev_ena becomes a bus in which each bit corresponds to a channel. As long as rx_std_byterev_ena is asserted, the RX data received by the core shows byte reversal.
You can verify this feature by monitoring rx_parallel_data.
You can implement soft logic to perform byte reversal for the Enhanced PCS.
Refer to the Word Aligner RX Byte Reversal Feature section for more information.