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.
| 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.
| 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. |