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Altera_Forum
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15 years ago

Multiple READ and WRITE controllers to SDRAM with AVALON BUS (No Nios)

Hi, Working on the following project : - Read 1 images from 2 camera's (2 image's) -> store to SDRAM - Make calculation on each image -> store to SDRAM - Read out calulations from ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

A DMA is told what to do by a CPU normally but the CPU stays out of the data path. For example the CPU in your case would tell the DMA to read 'x' number of bytes from your camera and write them to address 'y' in memory.

Your external micro-controller could be the one in control of the DMA. If you think the CPU telling the DMA what to do will add too much overhead then you may be able to use a scatter gather DMA which will buffer multiple descriptors (transfer requests) to hide any CPU to DMA inefficiencies.