Receive – Issues After Training - 3.1 English - PG300

This section contains debugging steps if the monitor is not displaying video even after a successful training or if the monitor display is noisy.

1. If the video timing counters are reporting 0 lines, toggle the DTG enable and software-video reset and check again.
2. Check the symbol and disparity error counters 0x448 and 0x44C through AXI reads. If the errors are accumulating, the alignment bit might go off eventually. Perform dprx_init one time and toggle HPD so the source can train the sink again.

   If you want to check the signal quality and integrity on the link, a signal "eye scan" can be done (using external equipment) at the receiving end of the DP link.

3. Training lost can occur:
   • When there is change in link configuration and RX is in previously trained state
   • Either symbol lock/channel equalization/clock recovery failure
   • Lane inactivity