What is Sgmii?

The serial gigabit media-independent interface (SGMII) is the interface with the lowest pin count available for connecting compatible MACs and PHYs. It consists of pairs of Txdata, Rxdata, and Rx Ref Clk data pins.

What is MII 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 Sgmii PHY?

The Serial Gigabit Media Independent Interface (SGMII) is a connection bus for Ethernet Media Access Controllers (MACs) and Physical Layer Devices (PHYs) defined by Cisco Systems. It replaces the classic 22-wire GMII connection with a low pin count, 4-pair, differential SGMII connection.

What speed is Sgmii?

The serial gigabit media-independent interface (SGMII) is a variant of MII used for Gigabit Ethernet but can also carry 10/100 Mbit/s Ethernet. It uses differential pairs at 625 MHz clock frequency DDR for TX and RX data and TX and RX clocks.

What is 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.

What is Rgmii port?

RGMII Timing Basics 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. Ethernet port is transmitting but not receiving.

What is the difference between MII and RMII?

MII vs RMII for Ethernet In MII, each PHY requires 18 signals to communicate with the MAC, and only 2 of these signals can be shared among multiple PHY devices. In RMII, the clock frequency used in the PHY runs continuously at 50 MHz for both 10 Mbps and 100 Mbps data rates.

What is Rgmii in Ethernet?

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.

What is Sgmii and RGMII?

What is MII and RMII?

MII vs RMII for Ethernet Therefore, RMII (reduced MII) was developed as a variant of MII to cut the number of unshareable signals per PHY interface in half (down to 8 per PHY). The RMII specification is also capable of supporting 10 Mbps and 100 Mbps data rates, and there are gigabit-capable variants.

What are the Mii, SGMII, and RGMII interfaces?

The MII, SGMII, RGMII are three kinds of interface between the MAC chip and the PHY chip. The Intel 82574L is one MAC chip. Looking following figure: For details about MII (100Mbps), SGMII (1Gbps, serial), RGMII (1Gbps, reduced) definition, you can google them.

What’s the difference between SGMII and Gigabit Ethernet?

In gigabit ethernet it’s the SGMII – Serial Gigabit Media Independent Interface. So your Ethernet chip would connect to a 1000Base-X PHY using SGMII. It could instead connect to a 1000Base-T PHY device using the same SGMII interface. There are PHYs with RGMII, SGMII and MDI. In these case RGMII connect to MAC.

What’s the difference between Mac to PHY and SGMII?

Even though the MAC-to-PHY SGMII link is always 1000Mbps, it supports 10, 100 and 1000Mbps past the PHY and the MAC need to know this to space out the bits properly (e. g. if the external link is 100Mbps, each bit on the SGMII link is sent 10 times). Most Ethernet systems are made up of a number of building blocks.

Which is better RGMII or SGMII for 100BASE-T1?

A 100BASE-T1 PHY that supports RGMII or SGMII offers an easy migration path to a 1000BASE-T1 PHY when needed. SGMII, using low voltage differential signaling (LVDS), offers the benefit of 10x the data bandwidth with fewer signal lines, shrinking solution size.