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Altera_Forum's avatar
Altera_Forum
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17 years ago

Avalon-MM master interface on Frame Buffer

I have a video system using a single SDRAM controller and two frame buffers. I've configured the controller with parameters from the memory data sheet and am unsure how to correctly configure the Av...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

Hi,

jakobjones is right when suggesting that you should typically use the same memory width as your local memory interface width but there could be cases where this is not the best thing to do because the frame buffer is not always efficient when packing pixels into words.

For instance, 16-bit words would be perfect for 8-bit RGB in sequence but the GUI should prevent you from using 16-bit words with 8-bit RGB in parallel. For 10-bit YCbCr in sequence, each 16-bit word would pack a single 10-bit sample and the rest would be lost. Using larger words can compensate for this behaviour.

vgs