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Documentation of DMA support (or lack therof) #5
Open ocghost opened this issue over 20 years ago
ocghost commented over 20 years ago

It would be nice if the PCI bridge project page specified if DMA transfers were possible on the PCI bus. There have been innumerable (mostly unanswered) questions on the list asking if this core supports PCI DMA.

mikehsr commented almost 20 years ago

Are you talking about PCI 'Burst' or on 'on-board' DMA engine?

From what I can see in the code, at least the Target will allow bursts upto the FIFO size.

If 'On-board' DMA, then I don't see why the Wishbone DMA Bridge I/P coudn't be used.

ehliar commented over 17 years ago

The idea would be that an on-board DMA engine could make much better use of the PCI bus bandwidth than a simple bus bridge. So a bus-bridge + wishbone DMA Bridge core would not be very effective as compared to a DMA engine that knows about the PCI bus...


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