SLLA642 July   2024 TUSB564-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2USB Type-C With DisplayPort Alt-Mode
    1. 2.1 USB Type-C Basics
    2. 2.2 Adding USB3
    3. 2.3 Adding DisplayPort Alt-mode
  6. 3USB 4-Meter System
  7. 4USB 9-Meter System
  8. 5DisplayPort 4.6-Meter System
    1. 5.1 5.4Gbps
    2. 5.2 8.1Gbps
  9. 6DisplayPort 9.2-Meter System
  10. 7Summary
  11. 8References

5 DisplayPort 4.6-Meter System

To begin testing an example DisplayPort system, one 4.6-meter DisplayPort cable is used in the signal path. This cable is placed before the TUSB564-Q1, and a oscilloscope is connected directly downstream from the TUSB564-Q1 bench board. The bench board adds additional loss with the short pre and post-channel FR4 trace. A DisplayPort source is connected upstream, and measurements are taken on the downstream oscilloscope.

DisplayPort 4.6-Meter System Block Diagram Figure 5-1 DisplayPort 4.6-Meter System Block Diagram

This test is run at both 5.4Gbps and 8.1Gbps to show the effect of data rate on the signal quality. A higher data rate signal is more sensitive to insertion loss and requires more equalization to recover after a lossy channel.