What is Sgmii and RGMII?

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 a Sgmii interface?

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 RGMII interface?

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 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 a PHY chip?

Ethernet: A PHY chip (PHYceiver) is commonly found on Ethernet devices. Its purpose is physical, analog signal access to the link. It is usually used in conjunction with an Media Independent Interface (MII) chip or interfaced to a microcontroller that takes care of the higher layer functions.

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 is MDIO interface?

The MDIO Interface component supports the Management Data Input/Output, which is a serial bus defined for the Ethernet family of IEEE 802.3 standards for the Media Independent Interface (MII). The MII connects Media Access Control (MAC) devices with Ethernet physical layer (PHY) circuits.

What is PHY interface?

A PHY, an abbreviation for “physical layer”, is an electronic circuit, usually implemented as an integrated circuit, required to implement physical layer functions of the OSI model in a network interface controller.

What is the difference between MDI and xMII interfaces?

The MDI uses balanced differential pairs, and so if the PHY does not have on-chip termination resistors, parallel split termination (preferred to filter common-mode noise) must be added to the board. Similarly, the xMII interface should have series termination resistors, either on-chip or on-board.

What is SAP xMII?

SAP xMII – often referred to as SAP Xapp manufacturing integration or intelligence, is considered as an integral part of xApps. It is a popular SAP AG product in the Net weaver suite. It lays focus upon and is specifically designed to cater to a wide range of industries and applications.

What are the requirements for the xMII and RX signals?

The xMII signals need to be 50 ohms, single-ended, and the TX signals must be length matched with the TXC (TXCLK). Similarly, the RX signals must be length matched with the RXC (RXCLK). Designers should check the PHY and MAC datasheet for the presence of internal termination resistors, and if they do not exist, they must be placed on-board.

What is a medium-independent interface (MII)?

After the PHY has completed its job with the signal bits, it directly sends them through the “ Medium-Independent Interface (MII)” to the MAC controller, which creates and validates the frame structure according to the defined protocol. The PHY uses the MDI for the RJ-45 connection. The MII is used for the interface between PHY and MAC.