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AM5728: PCIe device capability

Layla Chen
Prodigy 50 points

Part Number: AM5728

We just saw table 4 PCI-Express(PCIe) Tracelength in the High-Speed Interface Layout Guidelines.pdf

Is PCIe device length 4700mil on total channel for AM5728? If not, how about the PCIe device capability?

 PCIe length is 9300mil on our design board and insert this card (ECP5 PCI Express Development Kit) directly. it's ok? 

ECP5 PCI Express Development Kit :

http://www.latticesemi.com/Products/DevelopmentBoardsAndKits/ECP5VersaDevelopmentKit.aspx

 

 

High-Speed Interface Layout Guidelines.pdf : table 4.

  • 0
    TI__Mastermind 27890 points
    Hello Layla,
    You are correct in that 4700 mils is the maximum recommended PCIe channel length for this device. Due to the number of variables involved, I can't comment on the likelihood of your finding PCIe issues in the bus topology you are suggesting.

    I'd suggest that you evaluate your system using an off the shelf PCIe GEN2 card prior to investing in the ECP5 kit; if you see fatal errors (or a significant number of non-fatal errors) reported via the AER (Advanced Error Reporting) registers in this evaluation, I would expect the same when interfacing with the ECP5 kit. In this case a board re-design would be required.
  • 0
    Prodigy 50 points

    Part Number: AM5728

    Hi,

    For AM5728, we want to know the drive strength for PCIe Gen1, Gen2, and Gen3.

    PCI-Express Tracelength is 4700mils on AM57xx table 4 for High-Speed Interface Layout Guidelines. pdf, is this the total channel strength of Gen3?

  • 0 in reply to Layla Chen
    TI__Mastermind 27890 points
    Hello Layla,
    AM572x only supports PCIe GEN1 and GEN2. PCIe GEN3 is not supported on this device. The AM6xxx family of devices does support PCIe GEN3 if that is a requirement for your project.

    The maximum recommended trace-length published in SPRAAR7 is speed-agnostic and no distinction is made for GEN1 vs GEN2.