PCIe to PCI expansion

[GS]

I need to add a couple more PCI cards in my RTAI box. Have anyone
tried expansion boxes such as these? Would they work seamlessly with
RTAI/COMEDI? Any other vendors?

http://www.startech.com/Cards-Adapters/Slot-Extension/PCI-Express-to-2-PCI-Full-Length-2-PCIe-Single-lane-Expansion-Box~PEX2PCIE4L

Thanks.

[Ian Abbott]

DMA throughput may suffer a lot in the when transferring data in the
CPU-to-device ("writing") direction, but DMA throughput in the
device-to-CPU ("reading") direction shouldn't be affected very much.

If they upgrade the chipset from TI-XIO2000A to TI-XIO2001, the
thoughput in the CPU-to-device direction should be better because "The
XIO2001 incorporates a new logic module which greatly improves the
performance of upstream memory read transactions. This auto pre-fetch
agent will generate speculative read requests on behalf of a PCI master
or masters."

http://www.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=scpa046&fileType=pdf

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