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reduced gigabit media independent interface (RGMII)

Reduced GigabitMedia Independent Interface (RGMII) is a reduced version of a media independent GMII interface for Gigabit Ethernet. As with RMII, the reduction refers to the number of pins and the number of transmission lines.

If GMII works with eight data lines in both directions, then RGMII has only four data lines in both directions. The number of pins has also been halved from 24 to 12. In addition to the data lines, two clock lines and two error lines are used.

In order not to have to increase the clock rate of 125 MHz, the DDRmethod is used in RGMII instead of the SDR method, which works with one edge of the clock pulse, in which both edges of the clock pulse are used. In the DDR method, data is transmitted on both the rising and falling edges of the clock signal.

RGMII can be clocked at 2.5 MHz, 25 MHz and 125 MHz. The bit rate is 10 Mbit/s, 100 Mbit/s and 1000 Mbit/s.

Informations:
Englisch: reduced gigabit media independent interface - RGMII
Updated at: 23.04.2015
#Words: 158
Links: media, gigabit media independent interface (GbE) (GMII), interface (I/F), Gigabit Ethernet (GbE), arsenic (As)
Translations: DE
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