Receive – Issues After Training - 2.1 English

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

• If the video timing counters are reporting 0 lines, toggle the DTG enable and software-video reset and check again.
• 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 once and toggle HPD so the source can train the sink again.
• 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