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Altera_Forum's avatar
Altera_Forum
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15 years ago

Little help with DMA reading from a source

Hello i have a fifo that get's filled after 10 seconds and i want to read half of the fifo from my DMA. How can i do that? I am recieving a half_full signal from my fifo, which generates an IRQ. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Simply change to 32 the DMA length (which is now 0x10 in your example)

Then, you probably want the tx channel to get data from a constant address, since usually FIFOs work this way;

so, you need to set the RCON bit in the DMA control register (this applies to the standard Altera DMA core; in other cores there will be a similar control bit).