we are using a adv7850 with 2 VGA inputs. The 7850 output is connected to the input of a adv7626.
when we do 1600x1200, 60hz(DMT standard format), the 7850 detects the format correctly & we write the vid_std(0x16) for that resolution. The problem is that on the 7626, we see de regen & sometimes vert. lock interrupts triggering. There is either no video output from the 7626 or its unstable(flickers & intermittent).
we have no issue doing many other VGA resolutions. Also, this same format over hdmi is stable - its only an issue with VGA inputs
are there some magic bits/register settings that need to be applied for this to work?
we have current products that use the adv7842 & have no problem with this vga format.