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AUBoard 15P PCIe SRNS mode
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PCIe SRNS mode

scwest
scwest 5 days ago

I have been trying to test pcie with asynchronus clocks. I have used the tutorial on programmable clock sources to update SFP+ clock to be 100MHz and used it as pcie ref clock. I have been having toruble establishing a link. 

I wanted to know if the termiantion on the SFP+ clk line would cuase any issues. There could be other factors like incresed loss in the set up cuasing this error, but I just wanted to make sure this was a viable path. 

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  • iksevas
    iksevas 2 days ago +1 verified
    What date rates are you targeting? PCIe Gen 3 or earlier or PCIe Gen 4? The decoupling.caps on rev 1 for the board are not proper values for Gen 4 and linking with certain machines could prove troublesome…
  • iksevas
    +1 iksevas 2 days ago

    What date rates are you targeting? PCIe Gen 3 or earlier or PCIe Gen 4? The decoupling.caps on rev 1 for the board are not proper values for Gen 4 and linking with certain machines could prove troublesome. Also, have you been able to probe the 100MHz clock you generated to see how it looks?

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  • scwest
    0 scwest 2 days ago in reply to iksevas

    Currently testing it with PCIe Gen 2. I have measured the clock and the frequency is correct and the peak to peak is ~0.7V which also should be fine. 

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  • iksevas
    0 iksevas 2 days ago in reply to scwest

    Review the GT settings in your design. The GTs in the PCIe IP provide a default mapping that is different from the AUBoard GT mapping. The last tab in the PCIe IP has an override button that will allow you to set the appropriate pinout constraint to map to the AUBoard.

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  • scwest
    0 scwest 2 days ago in reply to iksevas

    I had done previously. My orginal design was a common clock and then converted it to SRNS. I chnaged the clock to be sourced SFP+ clk and unslected enable slot clock confgiuration. I think that there could other issues within my system causing these errors. 

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