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Altera_Forum's avatar
Altera_Forum
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16 years ago

Simple VIP system produces incorrect output

Dear fellows, need your help... System notation: PG = Pattern Generator CSC = Color Space Converter CR = Chroma Resampler CVI = Clocked Video Input CVO = Clocked Video Output "...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

My input is 1280x720 (1650x750 with blanking), I tried CVI and CVO FIFOs of the size from 1280 to 4096 - did not help.

The CVO threshold has been attempted at 500, 1000 and 4095 - did not help.

Tried using dual clocks (74.25MHz at the CVI input and CVO output and 74.25*5/3 internaly for SOPC processing) - did not help.

Yes, the simpler system using just a PG and CVO did work.

It appears the system works as long as the VIP Pattern Generator is

a) used as a source of video stream, and

b) stays within the last SOPC block in the chain. If the PG is removed to a separate SOPC block (PG + CVO), followed by (CVI + whatever + CVO) block, then this immediately stops working properly with the symptoms descibed in the oroginal post as "Busted".

Thanks for your suggestions - look forward to additional feedback.