What is RGMII?

RGMII (Reduced Gigabit Media Independent Interface) is a standard interface used to connect Ethernet MACs (Media Access Controllers) to PHYs (physical layer transceivers) in Gigabit Ethernet systems. It reduces the number of signals required compared to GMII, primarily by using double data rate (DDR) signaling, where data is transmitted on both the rising and falling edges of a clock signal. It's commonly used in network devices like switches, routers, and network interface cards to provide a high-speed connection between the MAC and the physical network.