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Altera_Forum's avatar
Altera_Forum
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14 years ago

Invalid output from MM--> ST (SGDMA)

Hi, Im wondering if anyone experience this problem before. i was transferring content in my SDRAM to a DCFIFO outside of SOPC using SGDMA. The SDRAM content is all zeros. but after the SGDMA...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

No I haven't faced a problem like that... Are you sure that the RAM contents is 0? Especially if you have a data cache, ensure that it is flushed before you start the transfer.

Is the DMA reading at the correct address?

Use a Signaltap instance to monitor what the SGDMA is doing.