22.214.171.124.5. 8B/10B Encoder Bit Reversal Feature
The bit reversal feature reverses the order of the bits of the input data. Bit reversal is performed at the output of the 8B/10B Encoder and is available even when the 8B/10B Encoder is disabled. For example, if the input data is 20-bits wide, bit reversal switches bit  with bit , bit  with bit  and so on.