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DS80PCI800: signal detect level question

CK Ho
Expert 1780 points
Part Number: DS80PCI800

Dear sir,

Our customer is using DS80PCI800, and they want to ask a question.

For our spec, the signal detect assert/deassert level is 180mV and 110mV.

But in PCIe CEM spec, the Vrx-eh-8g is 34mV. (please see the below figures)

Customers want to know why the difference is so much?? Why the TI spec is so strict?? Or what is intention to??

  • 0
    TI__Mastermind 43795 points

    The eye height is only the inner eye amplitude.  The signal detect voltage is refering to a clock only pattern.  When the signal detect function is working with actual PCIe data at 8 Gbps the detection voltage is much lower.   For PCIe applications we recommend the default setting for signal detect.  It is used for 99% of redriver applications in PCIe.

    Regards,

    Lee