We have many problems with PAL CVBS output generation using ADV7391 when the input frame contains white pixel at the end of lines.
The input frame format is BT656 (with embedeed EAV/SAV).
The configuration of ADV is:
So, when we add white (thanks to a light on our CMOS Sensor) on the image, the first consequence is black line on the screen:
We can see these lines on the signals:
If we add more white on the image, the monitoring screen loss the synchronisation and following signal are acquired:
4.43Mhz unexpected oscillation before synchro:
We also notive that our white level is 735mV instead 700mV, but we added a gain to reduce this point and our problems were still notived.
Do you identify the root cause of these problems ?
EDIT: This is a custom board and I don't have the EVB.