The customer use two board (use ADV7612+FPGA+ADV7511 as a unit card) cascade with each other to dispaly in the LED screen, the first level ADV7511's output to next levl ADV7612's input, they just use two card to display. But there's turn out that the next level's ADV7612's output HS signal is unnormal somtimes and in the same level board's ADV7511 with no output (the actual phenomenon is no display in the LED screen).
Does it there any advice abot that for this cascade application? And the two P/N register setting code shows in the attachment. Please advice.