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DS80PCI800: application

Amy Luo
Expert 6895 points
Part Number: DS80PCI800
Other Parts Discussed in Thread: DS80PCI810

Hi team,

My customer project adopts blade motherboard + backplane + device card architecture. Because the PCB wiring is long, the customer uses two ds80pci800 on the motherboard side, but does not use the PCIe repeater on the device card side. Is this scheme feasible?

Best Regards,
Amy Luo

  • 0
    TI__Mastermind 43795 points

    Hi Amy,

    Cascading the DS80PCI800 devices is not recommended.  Ideally a single DS80PCI800 would be placed closer to the host and endpoint Rx inputs.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    TI__Expert 6895 points

    Hi Lee,

    Thank you for your reply.

    Sorry, I didn't describe it clearly. It is not used in cascade, but DS80PCI800 on TX and Rx are placed on the motherboard side. Is there a problem with this application?

    Best Regards,
    Amy Luo

  • 0 in reply to Lee Sledjeski
    TI__Expert 6895 points

    Hi Lee，

    Sorry to bother you again.

    The main problem for my customer is that the chip can not be placed between the back board and the device card, and can only be placed on the motherboard side.

    The DS80PCI800 on TX and Rx are placed on the motherboard side. Does this effective?

    The DS80PCI810 has better linearity ,Is it better to use it? Or is there a better recommendation

    Best Regards,
    Amy Luo

  • 0 in reply to Amy Luo
    TI__Mastermind 43795 points

    Hi Amy,

    I prefer to use the DS80PCI810.  The linearity is definitely better.  This improvement allows for a more optimal link training result. This is especially true for applications which put the DS80PCI8xx close to a system components Tx pins.

    Fortunately the PCI800 and PCI810 are pin compatible so it is easy to switch.

    Regards,

    Lee