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Altera_Forum
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10 years ago

Do the DMA controller parameters in Qsys all function properly?

I need help with how to correctly set up the dma controller in order to get the maximum data speed between onchip to SDRAM. The current goal is to transmit 60MBytes/sec. I've tried setting the burst ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

I am not very familiar with Nios-DMA designs. So do be patient with me.

How is the connection between the onchip-memory-DMA-SDRAM? Is there any sharing of onchip memory/SDRAM with Nios?

You can try to signal tap and see whether transactions at the onchip/SDRAM interface is ok, ie continuous transfer or back-pressure at the interface and root cause the back-pressure. Can you increase the size of the bytes sent? Just to get better average compared to smaller data bytes that can be highly affected by overhead.

How did you come up with the 2MB/sec? Do you have timer/performance counter?