Reduced Gigabit Media Independent Interface
Reduced Gigabit Media Independent Interface (RGMII) specifies a particular interface between an Ethernet MAC and PHY.
RGMII uses half the number of data pins as used in the GMII interface. This reduction is achieved by clocking data on both the rising and falling edges of the clock in 1000 Mbit/s operation, and by eliminating non-essential signals (carrier-sense and collision-indication). Thus RGMII consists only of: RX_CTL, RXC, RXD, TX_CTL, TXC, TXD (12 pins, as opposed to GMII's 24). Ie FrameStart-BitClock-Data.
Unlike GMII, the transmit clock signal is always provided by the MAC on the TXC line, rather than being provided by the PHY for 10/100 Mbit/s operation and by the MAC at 1000 Mbit/s.
RGMII supports Ethernet speeds of:
| Bits/Clockcycle | ||
|---|---|---|
| 10 | 2.5 | 4 |
| 100 | 25 | 4 |
| 1000 | 125 | 8 |
Read more about this topic: Media Independent Interface
Famous quotes containing the words reduced, media and/or independent:
““Write that down,” the King said to the jury, and the jury eagerly wrote down all three dates on their slates, and then added them up, and reduced the answer to shillings and pence.”
—Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)
“Never before has a generation of parents faced such awesome competition with the mass media for their children’s attention. While parents tout the virtues of premarital virginity, drug-free living, nonviolent resolution of social conflict, or character over physical appearance, their values are daily challenged by television soaps, rock music lyrics, tabloid headlines, and movie scenes extolling the importance of physical appearance and conformity.”
—Marianne E. Neifert (20th century)
“The soul of me is very selfish. I have gone my way after a fashion that made me the center of the plan. And you who are so individual, who are so independent a spirit, whose soul is also a kingdom, have been so loyal, so forgiving, so self-sacrificing in your willingness to live my life. Nothing but love cold have accomplished so wonderful a thing.”
—Woodrow Wilson (1856–1924)