udo wrote:Oh thanks I missed the hints in the Porting guide. So they are "only" needed for the hdmi scaler? VGA Output should work without them too?
So far I can not try it on target, because my IO-Board is still not here ...
These signals are used for VGA too. For blanking and OSD. See the sys.top.v source - it's not so big to explore.
Even though you want only ST core, i suggest to learn on more simple cores. Since many cores are ported from MiST, you can compare both versions of same core. Again - simpler core is better for start.