Forum Discussion

CSoil's avatar
CSoil
Icon for New Contributor rankNew Contributor
7 years ago

Cyclone V using TPG -> CVO, Mode match is not behaving correctly, but I am getting video out

My c code sets the parameters for mode 1 as the data sheet states, and video output functions, but when I read the Video Mode Match register, I get garbage instead of the expected 0x00002. When I ...
CSoil's avatar
CSoil
Icon for New Contributor rankNew Contributor
7 years ago

Hi Chee Pin,

The good news is, I realized that I had instantiated the CVO I module rather than the CVO II module.

The bad news is that although I have gotten the mode match register to feed back the correct value, I am still having issues when swapping from 1920x1080 to 1280x720 or from 1280x720 to 1920x1080 from the TPG -> CVO.

Is there some special command priority to allow this to work correctly? The FPS is going from 30 to 60 in the case of 1920 to 1280 and 60 to 30 in the case of 1280 to 1920. Is there a disconnect due to the FPS change? There is no change in the input pll clock.

Thanks,

Caleb Soileau