Connecting the MDIO to an External STA - 3.5 English

This Figure shows the MDIO ports of the QSGMII core connected to the MDIO of an external STA entity. In this situation, mdio_in_chx , mdio_out_chx , and mdio_tri_chx must be connected to a 3-state buffer to create a bidirectional wire, mdio_chx .

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 2-12: Creating an External MDIO Interface

X-Ref Target - Figure 2-12