AR# 68799

HDMI Transmitter (TX) Subsystem v2.0 - Software Driver 3.0 - Why do some sinks have problems receiving 576i video from the HDMI TX Subsystem?

Description

Why do some sinks have problems receiving 576i video from the HDMI TX Subsystem?

Solution

This is a known issue in v4.0 (Vivado 2017.4) and earlier versions of the software driver. It will be fixed in the HDMI TX Subsystem software driver v5.0, in Vivado 2018.1.

This problem is due to the HDMI TX Subsystem only setting the minimum set of AVI InfoFrame parameters. Some HDMI Sinks cannot detect the Pixel Repetition information.

Some sinks are expecting additional AVI InfoFrame fields to be set so that they can properly detect the incoming video.

Specifically for 576i, some sources are expecting the following fields to be set:

  • Picture Aspect Ratio (M1-M0)
  • Active Format Aspect Ratio (R3-R0)
  • Pixel Repetition Factor (PR3-PR0)

Vivado 2017.4 and early versions - You can add the above additional fields, and send custom AVI InfoFrames. 

For more information on how to send custom AVI InfoFrames, see (Xilinx Answer 68780).

Vivado 2018.1 and later versions - This issue is resolved.


Linked Answer Records

Master Answer Records

Associated Answer Records

Answer Number Answer Title Version Found Version Resolved
68780 HDMI Transmitter (TX) Subsystem v2.0 - Software Driver v3.0 - How do I send custom AVI InfoFrames? N/A N/A
AR# 68799
Date 04/20/2018
Status Active
Type General Article
IP