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You might use them within the same system, but I don't think you would use them together at the same time. Post a link of a system structure which you are not sure about.
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Ted, Please take a look at this screen shot, this is the qsys system constructed in the Altera tutorial "Using PCIe on DE4 boards". In the tutorial it says the PCIe IP core can be connected with the on-chip memory directly or through DMA/SGDMA.
I guess the "direct connection" here means using Avalon-MM master/slave interface without DMA. However in the screen shot, in the case where a DMA is used, the components are still connected through Avalon-MM interface. This is what I mean by saying "Both DMA and Avalon-MM Master are used together at the same time" in the above post.
https://www.alteraforum.com/forum/attachment.php?attachmentid=7263
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