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Ethernet AVB Endpoint User Guide www.xilinx.com 101
UG492 July 23, 2010
PLB Address Map and Register Definitions
MAC MDIO Registers
The Tri-Mode Ethernet MAC has MDIO master capability. To access an MDIO register via
the Ethernet MAC, construct the address as follows:
MDIO register address = PLB_base_address + 0x6000 + (MDIO_ADDRESS *8)
where MDIO_ADDRESS is a 10-bit binary address, constructed from the 5-bit MDIO
Physical Address (PHYAD) and the 5-bit MDIO Register Address (REGAD) as follows:
MDIO_ADDRESS <= {PHYAD, REGAD}
See the Tri-Mode Ethernet MAC User Guide and IEEE802.3 for further MDIO information.