Connecting the MDIO to an External STA - 16.2 English

1G/2.5G Ethernet PCS/PMA or SGMII LogiCORE IP Product Guide (PG047)

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16.2 English

The following figure shows the MDIO ports of the core connected to the MDIO of an external STA entity. In this situation, mdio_i, mdio_o, and mdio_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 1. Creating an External MDIO Interface Ethernet 1000BASE-X PCS/PMA or SGMII Page-1 Sheet.1 IPAD IPAD Sheet.2 Sheet.3 IBUF IBUF Sheet.4 IOB LOGIC IOB LOGIC Sheet.5 O O Sheet.6 I I Sheet.7 O O Sheet.8 I I Sheet.9 IO IO Sheet.10 T T Sheet.11 IOPAD IOPAD Sheet.12 Sheet.13 IOB LOGIC IOB LOGIC Sheet.14 IOBUF IOBUF Sheet.15 Sheet.16 1G/2.5G Ethernet PCS/PMA or SGMII 1G/2.5G Ethernet PCS/PMA or SGMII Sheet.17 mdc mdc Sheet.18 mdio_tri mdio_tri Sheet.19 mdio_out mdio_out Sheet.20 mdio_in mdio_in Sheet.21 mdc mdc Sheet.22 mdio mdio Sheet.23 X12811 X12811 Standard Arrow.47 Sheet.25 Sheet.26 Sheet.27 Standard Arrow.12 Sheet.29 Connector Dot Sheet.31 Standard Arrow.19