DisplayPort Intel® FPGA IP User Guide

ID 683273
Date 9/02/2022
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5.2.3. Audio and Secondary Stream Encoder Path

The audio encoder generates the Audio InfoFrame, Audio Timestamp, and Audio Sample packets from the incoming audio sample data stream. The secondary stream scheduler arbitrates the data flow among the Audio InfoFrame, Audio Timestamp, and Audio Sample packets and the incoming secondary stream packet into a single secondary stream in a round robin method.

Based on the requested lane count, the secondary stream encoder packetizes and inserts the secondary stream packets into the combined packetized video and MSA data.

The secondary stream encoder path consists of the following steps:

  1. The secondary stream encoder determines the valid windows of opportunity during vertical and horizontal blanking regions for secondary stream packets.
  2. The secondary stream encoder derives the parity byte and performs nibble interleaving for enhancing error-correcting capability.
  3. The encoder packetizes the secondary stream packets with SS and SE.
  4. The encoder inserts the secondary stream packets into the merged video and MSA data.