Inc. Network Card User Manual

30 www.xilinx.com 1-Gigabit Ethernet MAC v8.5 User Guide
UG144 April 24, 2009
Chapter 2: Core Architecture
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MDIO Interface
Table 2-9 describes the MDIO Interface signals. See “Using the MDIO interface,” on page
76.
Table 2-9: MDIO Interface Signal Pinout
Signal Direction
Clock
Domain
Description
mdc Output host_clk Management Clock: programmable
frequency derived from host_clk.
mdio_in
1
1. mdio_in, mdio_out and mdio_tri can be connected to a Tri-state buffer to create a bi-directional mdio
signal suitable for connection to an external PHY.
Input host_clk Input data signal for communication with
PHY configuration and status. Tie high if
unused.
mdio_out
1
Output host_clk Output data signal for communication
with PHY configuration and status.
mdio_tri
1
Output host_clk Tristate control for MDIO signals; 0 signals
that the value on mdio_out should be
asserted onto the MDIO bus.