Gigabit media independent interface gmii is an interface between the media access control mac device and the physical layer phy. In 100mbits networks, the supporting tasks are 4b5b encode and decode, scrambling, nonreturnto. So mdio is needed to exchange information in parallel to the phymac data interface. The module generates all necessary clocks and auxiliary supplies needed to run it locally and provides 125mhz. Each port configured and monitored through independent a serial mdio interface, which can optionally be omitted from the core. It is often used in contrast with mdix or mdix, which is similar to mdi, but switches the transmit and receive pins within the interface. June 24, 2010 phyless ethernet implementation using. Thoughts on lowpincount lowpower media independent interface.
It allows any physical layer to be used with the mac layer. Mdi medium dependent interface or management data input. Standard 4bit interface between the mac and the phy for communicating tx and rx frame data. This protocol is defined by rfc 3810 and rfc 4604 to establish multicast group membership in ipv6 networks. Designing rgmii interface with fpga and hardcopy devices. Corergmii is responsible for providing the interface between a standard gigabit media independent interface gmii to rgmii conversion. To achieve this, the data path and control signals are reduced and multiplexed. The gmii is the interface between the mac layer and the physical layer. Qad sera gat meda indeendent interace qsgmii ip overview cadence ip factory delivers custom, synthesizable ip to support specific design requirements. Miim media independent interface management mld multicast listening discovery. Thoughts on lowpincount lowpower media independent. Multiple rmii or smiisssmii ports for independent phy port operation. Reduced gigabit media independent, gigabit media independent interface rgmii is an alternative to the gigabit media independent interface.
Mdi is a type of ethernet port found on network devices. The lan8700lan8700i can be configured to support either the media independent interface mii or the reduced media independent interface rmii. Timitechnology independent machine interface 1 system i. I am a member of the applications support team and have worked on several customer. The serial gigabit media independent interface sgmii is a sequel of mii, a standard interface used to connect an ethernet mac block to a phy. The reduced gigabit media independent interface rgmii specification reduces the pin count. Every ethernet frame contains both a source and destination address, both of which are mac addresses. The reduced gigabit media independent interface rgmii has become a widely used alternative to the gigabit media independent interface gmii by offering lower pin count which enables board space, and cost, savings.
Gigabit media independent interface reduced area, power, complexity lower cost reduced crosstalk, ssn, emi lower ber 9. The interface operates at speeds up to mbits, implemented using a data interface clocked at 125 mhz with separate eightbit data paths for receive and transmit, and is. Nov 15, 2014 the media independent interface mii was originally defined as a standard interface used to connect a fast ethernet i. By analyzing past and current trends of social media, cyber friendships, patterns, and new features, discoveries have been made as to what makes a user interface for social media flourish. Mii media independent interfaces, all acronyms, viewed march 7. Many of the functions of the phy are performed autonomously. I am a member of the applications support team and have worked on several customer tickets inquiring about various products and. The startup mode of the phy can be set via strap pin configuration. An1405dp83848 single 10100 mbs ethernet transceiver. There exist feasible options for a lowpincount low power media independent. Composed of independent 8bitparallel trans mitandreceive synchronous data interfaces, the gmii is intended as a chiptochip inter face. Serial media independent interfaces smiisssmii and reduced media independent interface rmii for.
For 10mbits networks, the phy works with the manchester encode and decode mechanism. The mdio interface component supports the management data inputoutput, which is a serial bus defined for the ethernet family of ieee 802. Each port configured and monitored through independent a serial mdio. The interface defines speeds up to mbits, implemented using an eightbit data interface clocked at 125 mhz, and is backwards compatible with the media independent interface mii specification. This application note describes how to design a reduced gigabit media independent interface. When designing a successful user interface for a social media application or website, there are many factors that need to be taken into consideration.
The gigabit media independent interface gmii is an interface between the medium access control mac device and the physical layer. The mdi media dependent interface, sometimes called line interface of the module supports 1gbps baset interface natively and 10baset 100basetx as subset of it. It is an extension of the mii media independent interface used in fast ethernet. Media independent interface how is media independent. Ethernet datasheet qad sera gat meda indeendent interace. The rgmii interface has been designed in accordance with the standards and specifications agreed in the. The media independent interface mii was originally defined as a standard interface used to connect a fast ethernet i. Mii interface is described later in this document after the description of phy tasks. The assignee of the present application developed the sgmii serial gigabit media independent interface to reduce the pin count to 6 pins per interface. Medium dependent interface mdi refers to an ethernet port connection that is used to connect network devices hubs and switches with other hubs and switches without the use of a crossover cable or null modem. The industry standards were generated at different times and have differing applications. Ethernet interface or attachment unit interface aui.
Mii media independent interface is about the connectivity between mac and phy. Media independent interface final report ms 225250 sperry space systems p. The mii is a popular way to connect 100basefx links to copperbased fast ethernet devices. The cadence qsgmii ip provides the logic required to integrate a quad serial gigabit media independent interface with qsgmiimodified pcs functionality into any system on chip soc. Each interface has its advantages and disadvantages spi is already an industry standard and could be utilized with existing mac interface equipment. E t h e rn e t ethernet 10 gbps fiber e v o l u t i o n. Designed for rapid network connectivity prototyping this. Mdi media dependent interface is about the connectivity between phy and connectorjackrj45. Reduced gigabit media independent interface rgmii specification, v1. In other words, it is about txd and rxd signals from mac to phy. The gmii allows industry to develop additional p hysical lay er phy specificationsfor example, sup port for categor y5 utp cabling. The mii connects media access control mac devices with ethernet physical layer phy circuits. An variant of spi could allow stopping the clock for power savings.
Media independent interface mii, reduced gigabit mii rgmii, and serial gigabit mii sgmii are examples used for this session. Gigabit media independent interface gmii is an interface between the media access control mac device and the physical layer. Serial gigabit media independent interface the lvds ios in the intel stratix 10, intel arria 10, stratix v, stratix iv, stratix iii, arria v, arria ii gx fast speed grade, intel cyclone 10 gx and lp fpgas allow you to easily implement the serial gigabit media independent interface sgmii for 10100 mb or gigabit ethernet. As is known in the art, sgmii uses two data signals and two clock signals to convey frame data and link rate information between a 10100 phy and an ethernet mac. Reduced media independent interface rmii as specified in the rmii specification. Chapter 3 media dependent interface this phy device supports to two kinds of media interfaces. Reduced gigabit media independent interface rgmii is a standard interface, which helps in reducing the number of signals required to connect a phy to a mac. Physicalside interface phy mode to connect to an ex ternal phy through gigabit media independent interfacemedia independent interface gmiimii. The mii accesses phy registers as defined in the ieee 802. Gmii gigabit media independent interface the various layers of the gigabit ethernet protocol architecture are shown in fig.