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Altera_Forum's avatar
Altera_Forum
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10 years ago

mSG-DMA IRQ could not be cleared

Hi, I encountered the case that the IRQ bit in mSG-DMA status could not be cleared. I supplied descriptors for the MM-ST direction. The transfer size is small as 256Bytes. Every descriptor gener...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

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Hi,

I encountered the case that the IRQ bit in mSG-DMA status could not be cleared.

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First question: Are you only send as many "valids" and bytes as the DMA expects, or are you overrunning or underfilling the buffer?

Second: Are you doing single transfers, or are you doing descriptor polling or park mode or anything else fancy?