Gigabit Media Independent Interface
Gigabit Media Independent Interface (GMII) is an interface between the Media Access Control (MAC) device and the physical layer (PHY). The interface defines speeds up to 1000 Mbit/s, implemented using an eight-bit data interface clocked at 125 MHz, and is backwards compatible with the Media Independent Interface (MII) specification. It can also operate on fall-back speeds of 10 or 100 Mbit/s as per the MII specification.
Data on the interface is framed using the IEEE Ethernet standard. As such it consists of a preamble, start frame delimiter, Ethernet headers, protocol specific data and a cyclic redundancy check (CRC).
The GMII interface is defined in IEEE Standard 802.3, 2000 Edition.
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