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Topic Title: 790GX/SB750 PCI-e anomaly/question
Topic Summary: direct dma's between pci-e (1x) and pci-(16x) slots
Created On: 10/01/2009 02:29 PM
Status: Read Only
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 10/01/2009 02:29 PM
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markh@compro.net
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Posts: 2
Joined: 10/01/2009

I have a number of motherboards with 790GX and 790FX chip sets. Most of which have provided 1 pcie-16x, 2 pcie-1x slots, and 3 regular pci slots. I am using the 16x slot for a VMIC pcie (4x) 5565 reflective memory card. There is on board ATI video. I am attempting to do direct dma from cards (bus masters) on other buses into an out of this VMIC card. I am able to do writes into this card but cannot do reads. I get the same results using the regular pci slots for my dma originator as I do using the pci-e 1x slots. I can do direct dma writes to the card in the 16x slot but can't do reads????

I can do dma in and out of this VMIC card to/from main memory using it's dma engine no problem.

I have also a number of motherboards with nvidia chip sets with the same basic slot configuration. I have no problem with this using these MBs.

Why can't I do bus to bus dma reads out of this card in the 16x slot?

Any pointers would be appreciated.
 10/15/2009 06:05 AM
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markh@compro.net
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Can someone recommend somewhere I can go to find the answer to my problem with this chipset.
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