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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Multiple DMA problems

Dear all,

Currently I'm using three DMAs in my SOPC system to handle three different data transfers from three different FIFOs to a DDR3 memory. I have verified each FIFO and DMA data transfer and all of them work well.

The problem occurs when I put all FIFOs and DMAs in one SOPC system design. :( I ran the DMA data transfer in sequence (not parallel). Somehow my Nios software hung / stopped. The Nios software might stop in different location, but mostly it stopped when it tried to open the DMA ('alt_dma_rxchan_open' function) or when it checked the DMA data transfer volatile indicator variable. :confused:

Does anyone can help me to figure out what the exact problem is ?

Thanks ... looking forward any replies from you guys! :)

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    Hello, i need to use a DMA to transfer from a FIFO to a DDR2. Do you have any reference design? Thanks!