The controller provides I/O signals for two I/O interface paths:
- GMII/MII to the EMIO PL interface
- RGMII to the LPD MIO pins
The controller natively includes a GMII/MII interface that is routed to the EMIO PL interface where it can be converted to another format or consumed as is. The interface is also routed to the built-in RGMII adapter.
- EMIO - GMII/MII Interface Signals interface provides 10/100/1000 Mb/s bandwidth
The controller includes a GMII to RGMII adapter. The RGMII I/O interface is multiplexed through the LPD MIO for connection to an external PHY. This interface supports the 10/100/1000 Mb/s protocol. See the MIO - RGMII Interface Signals section.
MDIO to External PHY for RGMII
To support the external PHY for the RGMII interface, the controller includes a management data input/output (MDIO) interface. The MDIO interface includes clock, data, and output enable signals that are routed from the controller to LPD MIO pins. See MDIO Interface Signals section.
The controller has an internal loopback from the TXD to RXD signals in the GMII/MII controller.
- Ethernet loopback connecting TXD to RXD within a controller using the Network_Control [loopback_local] regoster bit.
In MAC internal loopback mode, both transmit and receive clock are sourced from the GEM_REF_CLK from the LPD clock controller.