I've encountered really strange problem. I receive analog VGA signal with AD9388A and ADV7510 serialize again. In most cases it works perfectly, but sometimes the picture is blinking or there is no picture at all.
Everything is seems to be fine. The AD9388A says the correct resolution and timing data of the incoming signal, but as I said some cases there is no picture or blinking.
The strange thing is when I adjust the ADC Sampling Phase register (DLL_PH[4:0] Sample Phase Adjustment, User Map, Address 0x6A, [4:0]) the picture becomes stable or picture appears on the screen.
Can anyone help me in this problem? I don’t think this is just the pixel phase, but I can’t find the source of this problem.
How Can I be sure the data on the pixel bus is correct?
Thank you for your help.