5.1.4. Source Auxiliary Packet Encoder
The auxiliary packets originate from several sources, which are multiplexed into the auxiliary packet encoder in a round-robin schedule. The auxiliary packet encoder converts a standard stream into the channel data format required by the TERC4 encoder.
The encoder assumes the data valid input will remain asserted for the duration of a packet to complete. A packet is always 24 clocks (in 1-symbol mode), 12 clocks (in 2-symbol mode), or 6 clocks (in 4-symbol mode).