Contents
What is RGMII in Ethernet?
Summary. The Reduced Gigabit Media Independent Interface (RGMII) is an alternative to the Gigabit. Media Independent Interface (GMII). In this application note, an RGMII adaptation module is used to reduce the number of pins required to connect the Gigabit Ethernet MAC to a Gigabit PHY from 24 to 12.
Is RGMII MII compatible?
Is RGMII compatible with MII/RMII ? Unfortunately a host with a RMII only port cannot connect to a RGMII PHY, it will not work out of the box, because two-bits(lines) of data, for RMII and 4-bits(lines) for RGMII.
What is RGMII interface?
The RGMII interface is the physical connection between the Ethernet PHY and the Ethernet MAC. The RGMII interface is a dual data rate (DDR) interface that consists of a transmit path, from FPGA to PHY, and a receive path, from PHY to FPGA. Both paths have an independent clock, 4 data signals and a control signal.
What is the difference between Sgmii and RGMII?
The pin count for all three interfaces are different. GMII and RGMII operate at 125 megahertz and SGMII operates at 625 megahertz. The important difference between RGMII and GMII is the pin count. Although RGMII has half the pins of GMII, it can still operate at gigabit speeds using the same clock frequency.
Which interfaces can connect to Miis?
Standard MII.
What does an Ethernet PHY do?
The Ethernet Physical Layer (PHY) is responsible for the physical link between the Ethernet controller and the network. This layer is onchip on the FT900 so only the differential signals are available at pin level. The magnetics allow different nodes on the Ethernet network to connect over long distances.
What is PHY interface?
A PHY connects a link layer device (often called MAC as an acronym for medium access control) to a physical medium such as an optical fiber or copper cable. A PHY device typically includes both Physical Coding Sublayer (PCS) and Physical Medium Dependent (PMD) layer functionality.
What is a Ethernet interface?
Ethernet networking interface refers to a circuit board or card installed in a personal computer or workstation, as a network client. A networking interface allows a computer or mobile device to connect to a local area network (LAN) using Ethernet as the transmission mechanism.
What is MII and Rgmii?
The Media Independent Interface (MII) is a standard interface used to connect a Fast Ethernet (i.e. 100Mb/s) MAC-block to a PHY. Reduced Gigabit Media Independent Interface (RGMII) specifies a particular interface between an Ethernet MAC and PHY. RGMII uses half the number of pins as used in the GMII interface.
What is MAC in Ethernet?
The MAC (Media Access Control) address is a devices hardware address. Each device on a local area network must have a unique MAC address assigned. The MAC address is often referred to as the Ethernet Address on an Ethernet network. The Ethernet address is 48 bits long and normally displayed as 12 hexadecimal digits.
Why do you need magnetic Ethernet?
Magnetics are part of the Ethernet specification for xBASE-T networks, and as such, they are required for all Ethernet enabled equipment. The magnetics protect against faults and transients, including rejection of common mode signals between the transceiver IC and the cable.