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SN65LVPE501: Using two SN65LVPE501 on a PCIe Gen 2 x2 interface

Harold Steger
Prodigy 190 points
Part Number: SN65LVPE501
Other Parts Discussed in Thread: DS50PCI401, DS50PCI402, DS80PCI102, DS160PR410, DS125BR111

I'm interested in using two SN65LVPE501 devices on a PCIe Gen2 x2 interface.  Is there any reason not to do this?  From a lane routing perspective, using these two ICs offers a cleaner route than using a single x4 device such as the DS160PR140 which has all of the PCIe lane inputs on one side of the IC and all of the PCIe lane outputs on the other.  The single x4 interface IC cause two of the lanes to be routed around to the far side of the IC.  Using two SN65LVPE501 allows for a more straight-through routing for all of the lanes.

  • 0
    TI__Guru** 111740 points

    Harold:

        Ticket was assigned and will get respond soon.

  • 0 in reply to Brian Zhou
    TI__Guru* 91440 points

    Hi Harold,

    Please consider using DS80PCI102 or DS50PCI401 or DS50PCI402.

    Regards,Nasser

  • 0 in reply to Nasser Mohammadi
    Prodigy 190 points

    Hi Nasser,

    Thanks for this information and I will definitely research the ICs you suggested above.

    My initial question is more about circuit topology or configuration.  I see three potential configurations for this type of circuit of adding a PCIe Redriver between the Root Complex and the Endpoint for a PCIe Gen x2 interface.

    Configuration 1:

    Configuration 2:

    Configuration 3:

    I am trying to find out if there's an advantage to one of the others.  I'm leaning towards configuration 1 because it allows straight through routing and the ICs are efficient (there are no unused drivers).  But I'd like to know if there's a configuration that TI recommends and, more importantly, the reasons behind that recommendation.

    Sincerely,

    Hal

  • 0 in reply to Harold Steger
    TI__Guru* 91440 points

    Hi Hal,

    I think configuration 1 or 2 is the way to go. Whether 1 or 2 depends on the End Point/CPU incoming RX or TX signals layout. If TX and RX are interleaved, then configuration 1 but if all RX or TX all are together then configuration 2. Also, please note DS160PR410 was introduced much later than these other parts and thus it has a better linearity and performance.

    Regards,Nasser

  • 0 in reply to Nasser Mohammadi
    Prodigy 190 points

    Hi Nasser,

    Thanks for this information.

    In this case, I'm interested in using the DS80PCI102 for this design.  You provided the following IBIS-AMI model (TI_DS80PCIxxx_IBIS_AMI_v5.zip) to me earlier today when I requested the model for the SN65LVPE501.  From the file's name, it appears that the model you provided applies to the DS80PCI102.  Would you please confirm that.

  • +1 in reply to Harold Steger
    TI__Guru* 91440 points

    Hi Harold,

    The model i sent earlier today applies to the DS80PCI102. You can use this model for your signal integrity analyses.

    Regards,Nasser

  • 0 in reply to Nasser Mohammadi
    Prodigy 190 points

    Hi Nasser,

    After researching the parts you mentioned and researching on TI’s website, now I’m leaning towards using TI’s DS125BR111.  This seems like a newer part than the DS80PCI102 and I’m guessing will have better linearity and performance as you mentioned for the DS160PR410.  Is there a different TI 1-Lane PCIe Redriver you would recommend?  

  • +1 in reply to Harold Steger
    TI__Guru* 91440 points

    Hi Harold,

    I believe DS125BR111 is our best option for 1-lane redriver.

    Regards,Nasser