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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

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Are you attempting to do three 1080p frame buffers at the same time? This would require a lot of memory bandwidth.

Assuming standard 1920x1080p60, the total horizontal width is 2200. This means you need to maintain a rate of 1920/2200*148.5=129.6 Megapixels/second in and out of the memory for each frame buffer. If you have three frame buffers, this is a total of 777.6 Megapixels/second.

How many bits per pixel are you doing? How wide is your memory bus? Is anything else using the memory?

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Hi Kevin

Thanks for your answer. I posted a reply showing my bandwidth calculations. Can you please have a look and let me know if I am doing it the right way.

Thanks

Faisal