HDMI Intel® FPGA IP User Guide

ID 683798
Date 3/03/2023

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5.1.4. Source Auxiliary Packet Encoder

Auxiliary packets are encoded by the 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 auxiliary packet encoder also calculates and inserts the Bose-Chaudhuri-Hocquenghem (BCH) error correction code.
Figure 22. Auxiliary Packet Encoder InputThe figure below shows the auxiliary packet encoder input from a 72-bit input data.

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).

Figure 23. Typical Auxiliary Packet Stream During Blanking IntervalThe figure below shows a typical auxiliary packet stream in 1-symbol per clock mode, where 0 denotes a null packet.