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Altera_Forum's avatar
Altera_Forum
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14 years ago

SGDMA debug

Hello, I am trying to learn how to use SGDMA to transfer data to memory. First of all, I am trying to connect SGDMA TX directly to SGDMA RX and check results. You can find the source code ->here<-...
Altera_Forum's avatar
Altera_Forum
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12 years ago

Thanks for your reply. I had worried something like this might be the case. In the last couple of days my plan has been to hack the "fifo_with_byteenables" block in the dispatcher to restart the chain.

My understanding is that the descriptors are held in a ram ("the_dp_ram"), so I'm trying to reset the read address to 0 at the end of my descriptor chain. So when "pop" is asserted and read address is at the end of my chain, reset the read address for the descriptor ram to 0 and set the "internal_used" back to its value at the beginning of the chain (I have 8 descriptors for 8 different memory locations). So far it seems to be working well, but I havent finished testing it yet.