RMII和RGMII 接口说明

1.RMII

The Reduced Media Independent Interface (RMII) specifies a low pin count Media Independent Interface (MII). It provides a common interface between physical layer and MAC layer devices, and has the following key characteristics: 

• Pin count is 8 pins (3 pins for data transmission, 4 pins for data reception, and 1 pin for the 50 MHz reference clock).

• 10 Mbps and 100 Mbps data rates are supported at both half- and full-duplex. 

• Data transmission and reception are independent and belong to separate signal groups. 

• Transmit data and receive data are each 2 bits wide, a dibit.

2.RGMII