What is RGMII used for?

The reduced gigabit media-independent interface (RGMII) uses half the number of data pins as are used in the GMII interface. This reduction is achieved by running half as many data lines at double speed, time multiplexing signals and by eliminating non-essential carrier-sense and collision-indication signals.

What is difference between RGMII and Sgmii?

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 mode?

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. The RGMII standard specifies that data and clock be output simultaneously (ie.

What is Ethernet PHY chip?

An Ethernet PHY is designed to provide error-free transmission over a variety of media to reach distances that exceed 100m. The Ethernet PHY is connected to a media access controller (MAC). The MAC is usually integrated into a processor, FPGA or ASIC and controls the data-link-layer portion of the OSI model.

What does Sgmii mean?

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.

How fast is Rgmii?

RGMII operates at 125 MHz in Gigabit mode, 25 Mhz in 100 Mbps mode and 2.5 MHz in 10Mbps mode.

What is the difference between MAC and PHY?

The PHY layer defines the physical and electrical characteristics of the network. It is responsible for managing the hardware that modulates and demodulates the RF bits. The MAC layer is responsible for sending and receiving RF frames.

What does PHY mean in networking?

the physical layer
PHY, defined by IEEE-802.3, is an abbreviation for the physical layer of the Open Systems Interconnection (OSI) model, and is also usually the most complex. It is special because it is the only layer of the OSI model where data is physically moved across the network interface.

What is the difference between Sgmii and SerDes?

SGMII performs the same task, extended to include gigabit Ethernet, although it can be used for 10/100 Mbit/s TX/RX as well. SerDes technology, which is often used with SGMII, provides LVDS (low-voltage differential signaling) for converting between serial and parallel signal routing, as shown in the figure below.

What is MII 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.