When connecting a NIC (Intel I210-IS) to an gigabit ethernet switch with integrated PHYs (Marvell 88E6176) using the SGMII interface, I came across the following question:

Since SGMII is a serialized version of GMII, it should contain a serialized version of MDIO, right?

Can I therefore assume, that I will be able to configure the switch via the SGMII interface?


MDIO is not a part of GMII or SGMII. SGMII does have some autonegotiation features, but it does not encapsulate MDIO.

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  • \$\begingroup\$ +1 sgmii is just the serdes data interface, the mdio to a phy that implements sgmii is something different. \$\endgroup\$ – old_timer Mar 11 '15 at 14:28

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