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bang0306
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Registered: ‎04-09-2016

Can I control AXI DMA / CDMA in scatter gather mode with signal from PL side ?

   Is there any chance that I can stop the SG mode CDMA transaction and restart it with a certain signal from PL side?
   Here is the situation. I have a PE, and two BRAMs behaving as ping-pong buffer. I want to move data from DDR to BRAM with CDMA SG mode. I know exactly the order of the descriptors. But I don’t want it to write the working BRAM (My PE may take some time to finish its task), until the PE tells it the current work has done and you can continue your transaction. In another way speaking,  I want to stop the transaction when one descriptor is finished, and when the PE consumes all the data of the current BRAM, it notify the CDMA to continue with the next descriptor (writing to the BRAM which just finished its task, at the same time, my PE can process the data in the other BRAM). Is that possible?

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cpalisidis
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Registered: ‎01-14-2020

Any thoughts on this topic? I am also interested!

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