A single packet buffer is provided for the extension packet. If the extension packet is available in the buffer, the packet is transmitted as soon as there is availability in the secondary channel. The packet length is FIXED to eight words (32 bytes).
Use the following steps to write an extended packet in the DisplayPort source controller:
- Write nine words (as required) into TX_AUDIO_EXT_DATA buffer.
- Wait for EXT_PKT_TXD interrupt.
- Write new packet (follow step 1).