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Altera_Forum's avatar
Altera_Forum
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20 years ago

Problem with DMA in new NIOS

Hello! I've made design for my custom board and I run it does work, but when I added to my design DMA it doesn't work. Then I remove dma from design it again does work. In old ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

A few days ago, when I tried Q5 and N5 to see what's new, I found one thing should be paid attention to, it's the DMA.

In N5, the DMA has a new option: the burst ...... In my design, there were 4 DMA worked parallely, and it selected the "burst ....." option, and the length I filled was 512. Then the compilation pained me extremely, it took me more than 5 hours to finish the Analysis & Synthesis process, not to mention the Fitter process. (In Q4.2,N1.1, at most 30min needed for the full compilation).

When I turn off the "burst..." option in the 4 DMAs, the compilation seemed to be normal, 40Min was needed, a slightly longer than the pervious release.

I do not know what's wrong with my first trial, but you should use the "burst...." option carefully. Maybe there are too many DMAs in my design or the 512 is too many.