SLLA611 september   2023 TDP1204

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2TDP1204 Controls for HDMI Compliance Testing
    1. 2.1 Adjusting Equalization for the Short Cable Model
    2. 2.2 Adjusting Equalization for the Worst Cable Model
    3. 2.3 Adjusting Differential Output Swing
    4. 2.4 Adjusting Termination
  6. 3Transmitter Emphasis Control
  7. 4Summary
  8. 5References

4 Summary

The register settings chosen depend upon each individual application, but this document demonstrates the effects that the receiver EQ, VoD, termination and redriver mode registers have on the HDMI 2.1 FRL waveform. The EQ settings in linear and limited mode need to be carefully selected to avoid HDMI mask violations and signal integrity issues. The VoD settings are utilized to control the output voltage swing in limited mode if a higher or lower voltage swing is needed to meet HDMI test requirements. While termination settings can be modified the recommendation is to set this register to 0x2h to take advantage of the automatic TX termination control based upon HDMI mode.