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DP83867IS: Why the strap resistance for SGMII MODE 4 is different from other mode?

John11513
Expert 5720 points

Part Number: DP83867IS

Hi,

For SGMII MODE 4 strap resistance, as datasheet says, Rhi=4k, Rlo=10k. Considering internal 9k pull down, the pin voltage will be 0.54VDDIO, is out of the target voltage range. Why?

Thanks,

John

  • 0
    TI__Mastermind 19780 points
    Hi John,

    The SGMII straps are set to provide a usable DC level for the differential signaling, and still hit the threshold for mode 4. The threshold for SGMII pins, in SGMII mode, is different than the table listed.

    Please follow the recommended strap resistor combination shown in the DS.

    Best Regards,