SLLA680 August   2025

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2DisplayPort Link Training Sequence
  6. 3AUX Transaction Syntax
    1. 3.1 Request Command Definition of AUX Transaction
    2. 3.2 Reply Command Definition of AUX Transaction
  7. 4Introduction of DS90LV047-48AEVM
  8. 5Configuration of Measuring AUX CH With DS90LV047-48AEVM and Logic Analyzer
  9. 6Summary
  10. 7References

6 Summary

The auxiliary channel of DisplayPort distinguishes it from other display interfaces like OLDI or HDMI because it supports bidirectional communication between DisplayPort source and sink devices. This brings many benefits to DP link training conditions with optimized link rates and voltage swing or pre-emphasis levels. However, the AUX channel can also have issues across the TX and RX of the system when incorrectly matched or implemented. This application note provides an approach to verifying the DisplayPort link training AUX transactions for debugging purposes.