Some high-speed data rate protocols use 64B/66B encoding to reduce the overhead of 8B/10B encoding while retaining the benefits of an encoding scheme. The TX synchronous gearbox provides support for 64B/66B and 64B/67B header and payload combining. The Interlaken interface protocol specification uses the 64B/67B encoding scheme. Refer to the Interlaken specification for further information.
The TX synchronous gearbox supports 2-byte, 4-byte, or 8-byte interfaces. Scrambling of the data is done in the interconnect logic.