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gigabit media independent interface (GMII)

The Gigabit Media Independent Interface (GMII) forms the interface between the Medium Access Control (MAC) and the Physical Layer (PHY) in the layer model ofGigabit Ethernet

. The GMII interface is a media-independent interface with 24 pins

thatcan be used with various transmission media. Data rates up to 1 Gbit/s are defined. The GMII interface uses an 8-bit interface clocked at 125 MHz.Data is transmitted over eight data lines in each direction. In addition, the GMII interface has six status lines for transmitting error signals and data integrity signals. There is an R version, which stands for Reduced, RGMII

, which uses only four data lines in each direction and has only 12 pins.

Layered Model of Gigabit Ethernet

Layered Model of Gigabit Ethernet

The GMII interface is backward compatible with the Media Independent Interface (MII) specifications. Therefore, it can also work with the data rates of classic Ethernet of 10 Mbps and Fast Ethernet of 100 Mbps. The transmitted data format on the GMII interface corresponds to the Ethernet frame.

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Englisch: gigabit media independent interface - GMII
Updated at: 23.04.2015
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Translations: DE