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DP83867E: Strap resistors of RX_D1/3 at RGMII

Shota Mago
Expert 6940 points
Part Number: DP83867E

Hi team,

When DP83867E is used as RGMII, strap resistors of RX_D1/3 pins are NOT necessary?

The datasheet and app note(SNLA258A) state strap resistors are needed at SGMII mode. But it doesn't mention at the case of  RGMII.

Best regards,

Shota Mago

  • +1
    TI__Genius 16696 points

    Hi Shota,

    Your understanding is correct, RX_D1 & RX_D3 are not strap pins, but there is a note in the data sheet saying that in SGMII mode they should match the strap resistors place on RX_D0 & RX_D2 respectively. 

    This is because these pins are used in SGMII mode, and we want to keep the impedance on the traces matched.

    To answer your question simply: yes, the strap resistors on RX_D1 & RX_D3 are not needed when using RGMII. They are only necessary when using SGMII.

    Regards,

    Alvaro