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Altera_Forum
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16 years ago

Buffer Overflow and Underflow in Clocked Video Input/Output

Hi I am designing a video system to buffer three HD 1080p video stream. The input is in RGB 4:4:4 format at 148.5MHz. Output is also the same. I am using Quartus 9.0 SP1. The system for ...
Altera_Forum's avatar
Altera_Forum
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16 years ago

You may be causing yourself problems having that burst length of 128. With a pixel width of 24 that means 5 pixels to every write/read. That means that each memory master is going to try and write/read 640 pixels each burst. I'd have to do the math but with all your masters writing/reading you may be temporarily starving the CVI and CVO. Try reducing the burst size to 32.

Your original post said you had 3 paths (3xCVI->3xBuffer->3xCVO). Get one path working first.

Also, set your frame buffers to triple buffering until you get things working.

Jake