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Altera_Forum's avatar
Altera_Forum
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11 years ago

SGDMA streaming to memory, how to start and stop?

I've read a couple of posts about the SGDMA on this forum, but can't see an answer to the specific problem I'm having. Our design has a streaming source that runs continuously. We need to captu...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

BadOmen, Ted,

Thanks for the replies, I wasn't aware of the mSGDMA.

As we're only trying to capture a block of data coming from our streaming source I can't see that we can just enable/disable the source. It will work at the start of a capture, but unless I update the source IP with a counter it will always stream extra data into the SGDMA at the end of capture before the CPU responds and switches it off.

My 'fix' for now is just to live with the SGDMA as is by increasing the size of the capture by enough samples to flush out the old data, and then discarding these extra samples from the front of the capture.