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I am working with the MXL86111I-AQB-R GBE Ethernet PHY and using RGMII instead of SGMII. Since the SGMII interface is not used, I am unsure how to properly handle the related pins:

  • Pin 38 (RX0_P) – SGMII Data Input (Positive)
  • Pin 39 (RX0_M) – SGMII Data Input (Negative)
  • Pin 40 (TX0_P) – SGMII Data Output (Positive)
  • Pin 41 (TX0_M) – SGMII Data Output (Negative)

From my understanding:

  • RX0_P and RX0_M (Input pins) → Should they be left floating or pulled down with resistors?
  • TX0_P and TX0_M (Output pins) → Is it safe to leave them unconnected (NC), or do they need termination?

I checked the datasheet, but I couldn’t find a definitive recommendation for unused SGMII pins. Any insights or reference designs would be greatly appreciated!

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1 Answer 1

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I can only say that it would be extremely unusual/unlikely if these pins can't just be left open. Especially when there's nothing mentioned in the datasheet.

Such an interface must be configured and enabled before it can work, so there's no harm in leaving it open.

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