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PCI Express x4 connected to PCI Express x1??

Tom Smith
Expert 2930 points


Any suggestions how to connect the 6678 multicore DSP eval board (PCI Express x4) with another platform that uses the PCI Express x1??

-Tom-

  • 0
    TI__Genius 12065 points

    Hi Tom,

    One C6678 device only has 2 lanes of PCIe (x2). If you have 4 lanes PCIe connector on the board, only the first two lanes are being used.

    You can simply connect Lane0 of PCIe on C6678 to Lane0 (the only one) on the other platform.

    Basically, PCIe1[RXN0]->PCIe2[TXN0], PCIe1[RXP0]->PCIe2[TXP0], PCIe1[TXN0]->PCIe2[RXN0] and PCIe1[TXP0]->PCIe2[RXP0].

    They can use different reference clocks. Or if you want to use common clock, you can connect CLKN/P on both PCIe devices to the same clock source as well.

    The signals of the other lane (Lane1) on C6678 could be left disconnected.

     

    Sincerely,

    Steven