June 24, 2010 phyless ethernet implementation using. Gigabit media independent interface gmii is an interface between the media access control mac device and the physical layer. The mac controls the access to the phy and transmits the data in an ethernet packet. Gmii is an acronym that can contain many meanings which are listed below. Ethernet quad serial gigabit media independent interface. Ps and plbased 1g10g ethernet solution application note. The device also integrates mdi interface termination resistors into the phy. Ethernet physical media devices phy and the gigabit ethernet controller. Ethernet technology storage networking industry association. It replaces the classic 22wire gmii connection with a low pin count, 4pair, differential sgmii connection.
Current variants include, reduced mediaindependent interface rmii, gigabit mediaindependent interface gmii. Gmii gigabit media independent interface is an ethernet interface standard, and rgmii reduced gigabit media independent interface is intended to be an alternative to gmii. I am a member of the applications support team and have worked on several customer. Physicalside interface phy mode to connect to an ex ternal phy through gigabit media independent interface media independent interface gmiimii. A trilevel encoding method where a change in the logic level represents a code bit 1 and the logic output remaining at. Or it may be lowercased to suggest a medium without switches, routers and other intelligence. There may be many popular meanings for gmii with the most popular definition being that of gigabit media independent interface. Xapp775 10 gigabit ethernetfibrechannel pcs reference design. The word ethernet is capitalized to signify the official standard. Ethernet quad serial gigabit media independent interface qsgmii ip datasheet. Technical reduced data gigabit sheet media independent. The design implements dualport gigabit ethernet using two dp83867ir gigabit ethernet phys, which are connected through the reduced gigabit media independent interface rgmii to am3359 sitara processor with integrated ethernet mac and switch.
It differs from gmii by its lowpower and low pin count serial interface commonly referred to as a serdes. Introduction to highspeed serial interface circuits and systems design practice for highspeed serial interface circuits. The msgmii offers this generic, reduced pincount interface to. Gigabit mediaindependent interface gmii is an interface between the media access control mac device and the physical layer phy. Please register the following device properties, for. The ksz9031mnx reduces board cost and simplifies board layout by using onchip termination resistors for the. Ethernet ip core and onboard intel xway phy11g pep7071 gigabit phy chip in intel cyclone 10 lp evaluation kit. Synthesis constraints files verilog functional verification suite full design, verification, and revision documentation related products. The purpose of this tutorial is to provide a detailed explanation of how the pcs and pma. Acronym spelled out da destination address dcm digital clock manager ddr double data rate fcs frame check sequence fifo first in first out fpga field programmable gate array. Mentors serial gigabit ethernet solution the mentor graphics msgmii module provides a serial gigabit media independent interface that facilitates connection between any ieee 802. Reconcilliation sublayer and media independent interface mii clause 35. Other ethernet communications interfaces such as tbi, rgmii v2.
The rgmii interface is routed through mio pins to interface with an external rgmii phy. Gigabit media independent interface reduced area, power, complexity lower cost reduced crosstalk, ssn, emi lower ber. Page 1 of 8 reduced gigabit media independent interface rgmii 12102000 version 1. The gigabit media independent interface gmii to reduced gigabit media. For 10mbits networks, the phy works with the manchester encode and decode mechanism. The interface defines speeds up to mbits, implemented using a data interface clocked at 125 mhz with separate eightbit data paths for receive and transmit. A synchronous gigabit ethernet protocol stack for high. For more information on how gigabit ethernet is defined to support different media, see sidebar on page 40. Serial gigabit media independent interface how is serial. 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. It is a standard interface specified by the ieee std 802. Application note an2036 frequently asked questions regarding.
Independent interface rgmii core provides the rgmii between rgmiicompliant. The interface operates at speeds up to mbits, imple mented us i ng a data interface clocked at 125 mhz with separate eightbit data paths for receive and transmit, and is. The rgmii interface has been designed in accordance with the standards and specifications agreed in the. Ethernet interface or attachment unit interface aui. Figure 3 summarizes the various gigabit ethernet options and the standards that define them. The mediaindependent interface mii was originally defined as a standard interface to connect. The principle objective of rgmii is to reduce the number of pins from 22 to 12 in a costeffective and technology independent manner. The purpose of this interface is to provide a simple interconnection between mac and phy that is independent of the physical media types. Its main distinction is the focus on simplicity both in the external user interface and internal operation. Data link layer the data link layer with respect to. Gigabit e thernet defines an enhanced mii, termed the gigabit media independent interface. Mac media access controller mdi medium dependent interface mdix media independent interface with crossover mef multiple ethernet frames mii media independent interface mlt3 multilevel transmission encoding 3levels.
Every ethernet frame contains both a source and destination address, both of which are mac addresses. Integrated 5port 10100managed ethernet switch with gigabit gmii. Reduced media independent interface rmii is a standard that addresses the connection of ethernet physical layer transceivers phy to ethernet switches. Reduced gigabit media independent interface rgmii v2.
This core can be used in all three modes of operation10100 mbs. Ethernet is the worlds most pervasive networking technology. To further reduce pcb trace complexity, the rtl8211n8212n also provides an innovative 2. The ksz9031nx reduces board cost and simplifies r board layout by using onchip termination resistors for the. This application note covers the most commonly asked questions about finisars baset sfps.
Gigabit ethernet extends the isoiec 88023 mac beyond 100 mbs to mbs. To support this new feature, the mediatype interface command has been modified. Please register the following device properties, for general. The gigabit media independent i nterfac e gmii is an interface between the medium access control mac device and the phy sical layer. The logicore quad serial gigabit media independent interface qsgmii core provides a flexible solution for combining four serial gigabit media independent interfaces sgmii into one 5 gigabits per second gbs interface, to significantly reduce the number of inputs outputs ios. Mdi medium dependent interface or management data input. Gigabit ethernet uses the extended ethernet mac layer interface, connected through a gigabit media independent interface gmii layer to physical layer entities phy sublayers such as baselx, basesx, basecx, and baset. Page 2 of 9 revision level date revision description 1. The reduced gigabit media independent interface rgmii module provides an rgmii interface to an existing ethernet mac design with a gmii or tbi interface, for example the gigabit ethernet mac gem available from cadence design foundry.
In addition to supporting energy efficient ethernet eee on the new generation of enabled macs, these products are. Ethernet quad serial gigabit media independent interface qsgmii ip product brief. The gmii to rgmii ip core provides the reduced gigabit media independent interface. Ethernet ip serial gigabit media independent interface msgmii submodules and data flow. Only essential ethernet functionality is supported. Serial gigabit media independent interface 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. Intel cyclone 10 lp fpga triple speed ethernet and onboard. Finally, the nrz serial data is converted to the mii format and provided as the. How to solve design challenges on interfacing ethernet phy. Please register the following device properties, for general use with any nic. In 100mbits networks, the supporting tasks are 4b5b encode and decode, scrambling, nonreturnto.
They can also function as 10baset and 100baset transceivers, but only after programming over a 2wire bidirectional serial interface. The ksz9031rnx provides the reduced gigabit media independent interface rgmii for direct connection to rgmii macs in gigabit ethernet processors and switches for data transfer at 10100mbps. The pcs is responsible for the encoding of data bits into code groups for transmission via the pma and the subsequent decoding of these code groups from the pma. Each port configured and monitored through independent a serial mdio interface, which can optionally be omitted from the core. The classic gmii interface defined in the ieee 802. Configures the phy autonegotiation to use fullduplex modes only. The gmii to rgmii solution delivers files to several file groups. Basic media independent interface management miim interface support that. For gigabit operation, the clocks will operate at 125mhz, and for 10100 operation, the clocks will operate at 2. It offers a wide input voltage range from 17 to 60 v. All source files are included with the reference design to allow customization for specific applications. Reduced gigabit media independent interface rgmii cadence. Overview of ethernet technology ethernet evolution frame format 10 gigabit ethernet technology. The inventra msgmii module provides a serial gigabit media independent interface between any ieee 802.
Realtek download english datasheets for realtek rtl8251. The device supports sgmii serial gigabit media independent interface for direct connection to copperfiber100base fx and copperfiber with auto media detect. 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. Interface and hardware component configuration guide, cisco.
The gmii allows industry to develop additional p hysical lay er phy specificationsfor example, sup port for categor y5 utp cabling. Standard 4bit interface between the mac and the phy for communicating tx and rx frame data. It offers mbps 1 gbps raw bandwidth, that is 100 times faster than the original ethernet, yet is compatible with existing ethernets, as it uses the same csmacd and mac protocols. Gigabit media independent interface media independent interface for connection to gmiimii macs in gigabit ethernet processors and switches for data transfer at mbps or 10100mbps. 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. The gigabit media independent interface gmii is an interface between the medium access control mac device and the physical layer. Gigabit ethernet serdes serializer deserializer device via a 20bit sdr or 10bit ddr interface and to the morethanip anyspeed mac layer device with a 16bit extended gmii gigabit media independent interface. Gigabit ethernet is the latest version of ethernet. 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.
Reconcilliation sublayer and gigabit media independent interface gmii 2 reduced gigabit media independent interface rgmii 412002 version 2. It reduces the number of signalspins required for connecting to the phy from 16 for an miicompliant interface to between 6 and 10. They are compatible with gigabit ethernet and baset standards as specified in ieee std. Apr 26, 2017 media independent interface mii for 10100 mbs and gigabit media independent interface gmii connectivity miigmii hardware io setup for xilinx spartan 6 family fpgas. Composed of independent 8bitparallel trans mitandreceive synchronous data interfaces, the. Page 1 of 9 reduced gigabit media independent interface rgmii 412002 version 2. This core supports cisco qsgmii specification version 1.
The core implements a phy management interface mdio with control and management registers as defined. Logicore ip quad serial gigabit media independent v1. Physicalside interface phy mode to connect to an ex ternal phy through gigabit media independent interface media independent interface gmii mii. The device supports quad serial gigabit media independent interface sgmii to copper and dualport sgmii system. As shown in figure3, the gmii interface connects the phy and ps gem through the emio pins. 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. Reduced gigabit media independent interface rgmii wifi murata lbee5u91cq module. Corergmii is responsible for providing the interface between a standard gigabit media independent interface gmii to rgmii conversion. Data transfer between mac and phy is via the reduced gigabit media independent interface rgmii for baset, 10baset, and 100basetx.
In this reference design, the triplespeed ethernet ip core is connected to the onboard phy chip through reduced gigabit media independent interface rgmii. Gigabit media independent interface proposal ieee 802 lanman. Tn13 latticeecp2mmarvell serialgmii sgmii physical. The quad serial gigabit media independent interface qsgmii core provides a flexible solution for combining four serial gigabit media independent interfaces sgmii into a single 5 gigabits per second gbs interface, to significantly reduce the number of input outputs ios. Gigabit ethernet uses the extended isoiec 88023 mac layer interface, connected through a gigabit media independent interface layer to physical layer entities phy sublayers such as baselx, basesx, and basecx, and baset. The interface between the rocketphy and the pcs can be a dual data rate implementation of a 10 gigabit 16. The rgmii interface has been designed in accordance with the standards and specifications agreed in the hewlett packard document reduced gigabit media independent interface rgmii.
Many commercial gigabit ethernet phy devices now use gmii as means to communicate to the mac. As shown in figure 1, the pcs translates between the respective media independent interface mii for each rate and the pma sublayer. Base x physical coding sublayer pcs and physical medium. Gmii gigabit media independent interface similar to aui multimode fiber 550m shorthaul copper 25m longhaul copper 100m figure 1 cahners instat group, 501 3 the gigabit ethernet standards ieee 802. Transceiver files for zynq7000 ap soc, virtex7, kintex7, or artix7 devices. Media independent interface mii, reduced gigabit mii rgmii, and serial gigabit mii sgmii are examples used for this session. This trimode fullduplex ethernet mac sublayer was developed in vhdl as an alternative to both commercial and free implementations for usage on fpgas. It is used for gigabit ethernet contrary to ethernet 10100 for mii. The serial gigabit media independent interface sgmii is a connection bus for ethernet macs and phys defined by cisco systems. Media access controller mac core, logiccore xaui core or 10 gigabit media independent interface xgmii reference design xapp606. This sgmii solution meets the sgmii specification and saves cost and power in systems that have low to high portcount gigabit ethernet per device. Application note an2036 frequently asked questions regarding finisars baset sfps finisars baset sfp transceivers are based on the sfp multi source agreement msa.
Basex physical coding sublayer pcs and physical medium attachment pma tutorial jon frain 61598 edited and expanded by mike henninger 42005 abstract. Gmii stands for gigabit media independent interface. Implementing gmii interface on c5 nxp semiconductors. Application note an2036 frequently asked questions.
Reduced gigabit media independent interface rgmii technical. The ksz91rnx provides reduced gigabit media independent interface rgmii and the ksz91mnx offers the industrystandard gmiimii gigabit media independent interface media independent interface for connection to gmiimii macs in gigabit ethernet processors and switches for data transfer at mbps or 10100mbps. Mii interface is described later in this document after the description of phy tasks. Gbps gigabit per second gemac gigabit ethernet media access controller gmii gigabit media independent interface hdl hardware description language. Gigabit media independent interface gmii is an interface between the media access control mac device and the physical layer phy. The rgmii will share four data path signals with the reduced ten bit interface rtbi and share control functionality with the fifth data signal. Ksz91rnx gigabit ethernet transceiver with rgmii support. The ieee standards committee approved the baset standard in june 1999. Pemcxmac 10100 mbps ethernet macamcxfif amcxfif 10100mbps fifo module ethernet ip serial gigabit media independent interface msgmii submodules and data flow. Ethernet technology 9 neat facts why is ethernet capitalized. Each of the two independent transceivers features an industrial standard gmii, mii, and rgmii reduced gigabit media independent interface. The integrated gigabit serial transceivers in intel stratix 10, intel arria 10, stratix v, stratix iv, stratix ii gx, arria series, intel cyclone 10 gx, cyclone v gx, cyclone v gt, and cyclone iv gx also support the sgmii interface. The device supports quad serial gigabit media independent interface sgmii to copper and dualport sgmii system to copperfibersgmii with auto media detect.
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