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Altera_Forum
Honored Contributor
Honored ContributorSimple PCIe DMA
I guess I could try to find the appropriate documentation, but I'll cheat and ask here! I need to find which DMA block to ask our HW team to add to qsys in order to do burst PCIe transfers from...
Altera_ForumHonored Contributor
Honored Contributor --- Quote Start --- I think the one we are currently using maps a chunk of Avalon address space to PCIe physical addresses by internally generating the high address bits - I don't see how this is of any use at all! --- Quote End --- Why not? If you're using the memory mapped interface then DMA target addresses use the high bits of the local address to determine which page of the address translation table to lookup to get a host address. It's simple enough and works well, all you have to do is set up the address translation table the way you want it. If you need multiple sources you'll just have to multiplex them somehow so that transfers are done in whatever sequence you need. The logic to do this can be pretty trivial. Nial.
