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Altera_Forum
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15 years ago

SGDMA Core loop problem - setting CHAIN_COMPLETED

Hello. OK, I have cut my project back so it consists of just the NIOS, SGDMA, SDRAM controller, and an onchip memory component. If I set up the SGDMA to transfer a set of bytes between t...
Altera_Forum's avatar
Altera_Forum
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15 years ago

Hi Daixiwen, thanks for taking a look.

Dont worry that was just for the test code ;)

In the SOPC project all SGDMA masters are connected to both the SDRAM and the on-chip memory.

In my main project (working on a video pipeline) I've added a few KB of on-chip memory for the descriptrors and it appears to be working (that is if I drive frames with solid colours I can see the appropriate signals on my scope).

I am happy with this solution as if anything it improves performance by reducing access to the on-chip memory, but still I would like to know for future reference why I can't store the descriptors on the SDRAM.

Is it possible this was just a quirk of that particular project, that it wasn't building properly?