MDIO Signal Definition - 9.0 English

Tri-Mode Ethernet MAC LogiCORE IP Product Guide (PG051)

Document ID
PG051
Release Date
2023-11-07
Version
9.0 English

The following table describes the MDIO (MII Management) interface signals of the core when the Add IO Buffers for MDIO Interface Ports option is not selected. These signals are typically connected to the MDIO port of an on-chip PHY device, such as the multi-gigabit transceivers. These signals are present whenever the optional Management Interface is used. The MDIO format is defined in the IEEE 802.3-2008 specification , clause 2.

Table 1. MDIO Interface Signal Pinout
Signal Direction Description
mdc Out MDIO Management Clock: derived from s_axi_aclk on the basis of supplied configuration data when the optional Management Interface is used.
mdio_i In In data signal for communication with PHY configuration and status. Tie High if unused.
mdio_o Out Output data signal for communication with PHY configuration and status.
mdio_t Out 3-state control for MDIO signals; 0 signals that the value on MDIO_OUT should be asserted onto the MDIO bus.

The following table shows the MDIO signals when the Add IO Buffers for MDIO Interface Ports option is selected. These signals are typically connected to the MDIO bus connects to an off-chip PHY device.

Table 2. MDIO Interface Signal Pinout with I/O Buffers
Signal Direction Description
mdc In/Out MDIO Management Clock: Derived from s_axi_aclk on the basis of supplied configuration data when the optional Management Interface is used.
mdio In/Out MDIO bus from the bidirectional I/O buffer inserted by the core. The core internally maps the mdio_i, mdio_o, and mdio_t signals to this bidirectional I/O buffer.