Connecting the MDIO to an External PHY Device - 4.1 English

GMII to RGMII Product Guide (PG160)

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4.1 English

This Figure shows the MDIO ports of the GMII to RGMII core connected to the MDIO of an external PHY device. Here, mdio_phy_i, mdio_phy_o, and mdio_phy_t must be connected to a 3-state buffer to create a bidirectional wire, MDIO.

This 3-state buffer can either be external to the FPGA or internally integrated by using an IOB IOBUF component with an appropriate SelectIO™ interface standard suitable for the external PHY.

Figure 2-7:      Creating an External MDIO Interface

X-Ref Target - Figure 2-7