Reduced gigabit media independent interface rgmii 12102000. The gmii to rgmii ip core provides the reduced gigabit media. 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. It is an extension of the mii media independent interface used in fast ethernet. This core supports cisco qsgmii specification version 1. Gigabit media independent interface gmii optional media access control mac full duplex andor half duplex base t pma transceiver base x phy 8b10b autonegotiation base t pcs unshielded twisted pair. Hewlett packard document reduced gigabit media independent interface rgmii. The mediaindependent interface mii was originally defined as a standard interface to connect a fast ethernet i. Ethernet interface or attachment unit interface aui. Common public radio interface cpri specification v6. Reduced media independent interface rmii is a standard that addresses the connection of ethernet physical layer transceivers phy to ethernet switches.
Ethernet interface is presented as a media independent interface mii. Figure 2 shows two examples of a gigabit ethernet line card with an intel fpga connected by the sgmii interface to a 10100 mbps or gigabit ethernet sfp. The 88e3015, 88e3016, and 88e3018 all support the reduced gigabit media independent interface rgmii, with the 88e3015 and 883018 also supporting the media independent interface mii. There may be many popular meanings for gmii with the most popular definition being that of gigabit media independent interface. Reduced gigabit media independent interface rgmii cadence. How is serial gigabit media independent interface abbreviated. The classic gmii interface defined in the ieee 802. Gmii abbreviation stands for gigabit mediaindependent interface. Com5401soft trimode 10100 ethernet mac vhdl source code overview mss 18221a flower hill way gaithersburg, maryland 20879 u. Ksz8795clx supports two management interface modes of spi and miim. With mac interface support for the gigabit media independent interface gmii, the legacy tenbitinterface tbi, and the new reduced gmii rgmii, the cis8201 connects to virtually any switch or systems controller with fewer components than competing transceivers. It allows any physical layer to be used with the mac layer. Media independent interface mii, reduced gigabit mii rgmii, and serial gigabit mii sgmii are examples used for this session.
Logicore ip quad serial gigabit media independent v3. 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. Mediaindependent interface mii for 10100 mbs and gigabit mediaindependent interface gmii connectivity miigmii hardware io setup for xilinx spartan 6 family fpgas. Overview of ethernet technology ethernet evolution frame format 10 gigabit ethernet technology demand for 10gbe 10gbe phy technology io consolidation over ethernet. The purpose of this tutorial is to provide a detailed explanation of how the pcs and pma. Gmii is an acronym that can contain many meanings which are listed below. It reduces the number of signalspins required for connecting to the phy from 16 for an miicompliant interface to between 6 and 10. When the management interface is omitted, configuration of the core can still be made via an alternative configuration vector. Configures the phy autonegotiation to use fullduplex modes only. Reduced gigabit media independent interface rgmii 412002 version 2. Logicore ip quad serial gigabit media independent v1. Mdi medium dependent interface or management data input. June 24, 2010 phyless ethernet implementation using.
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. Basic media independent interface management miim interface support that. Basex physical coding sublayer pcs and physical medium attachment pma tutorial jon frain 61598 edited and expanded by mike henninger 42005 abstract. 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. Physicalside interface phy mode to connect to an ex ternal phy through gigabit media independent interface media independent interface gmiimii.
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. The ksz9031nx reduces board cost and simplifies r board layout by using onchip termination resistors for the. Qad sera gat meda indeendent interace qsgmii ip overview cadence ip factory delivers custom, synthesizable ip to support specific design requirements. Gmii gigabit media independent interface the various layers of the gigabit ethernet protocol architecture are shown in fig. It replaces the classic 22wire gmii connection with a low pin count, 4pair, differential sgmii connection. Gigabit media independent interface proposal ieee 802 lanman. 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.
Gigabit media independent interface media independent. Basic mediaindependent interface management miim interface support that. Ethernet physicallayer transceiver for transmission and reception of data on. The principle objective is to reduce the number of pins required to interconnect the mac and the phy. The mac may in fact be a discrete device, integrated into a microprocessor, cpu or fpga. In addition, the gigabit ethernet mac with avb audio video bridging supports the technical standards developed by the ieee audio video bridging task group of the ieee 802. Standard 4bit interface between the mac and the phy for communicating tx and rx frame data. Gigabit media independent interface gmii optional media access control mac full duplex andor half duplex base t pma transceiver base x phy 8b10b autonegotiation base t pcs unshielded twisted pair ieee 802. The gmii is the interface between the mac layer and the physical 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 a single 5 gigabits per second gbs interface, to significantly reduce the number of input outputs ios. The serial gigabit media independent interface sgmii is a connection bus for ethernet macs and phys defined by cisco systems. What is the abbreviation for gigabit mediaindependent interface.
Corergmii is responsible for providing the interface between a standard gigabit media independent interface gmii to rgmii conversion. On the mii signals, the ieee specification states the bus should be 68 ohm impedance. It also supports optional reduced mii rgmii, and serial gmii sgmii. Logicore ip quad serial gigabit media independent v2. Reduced gigabit media independent interface rgmii v2. Each port configured and monitored through independent a serial mdio interface, which can optionally be omitted from the core. Media independent interface mii for 10100 mbs and gigabit media independent interface gmii connectivity miigmii hardware io setup for xilinx spartan 6 family fpgas. The gigabit ethernet core is designed for soc and mobile applications such as integrated networking devices, pciexpress ethernet controllers.
Ethernet quad serial gigabit media independent interface qsgmii ip product brief. 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. Every ethernet frame contains both a source and destination address, both of which are mac addresses. The gigabit media independent interface gmii, defined in ieee 802. Tn13 latticeecp2mmarvell serialgmii sgmii physical. Gigabit ethernet transceiver with gmiimii support microchip. Gmii gigabit media independent interface acronymfinder. Ethernet datasheet qad sera gat meda indeendent interace. The ksz9031rnx reduces board cost and simplifies board layout by using onchip termination resistors for the four the xilinx logicore ip gigabit media independent interface gmii to reduced gigabit media independent interface rgmii design provides the rgmii between rgmiicompliant ethernet physical media devices phy and the embedded.
Mii media independent interface gmii gigabit media independent interface rgmii reduced gigabit media independent interface tbi ten bit interface v integrated mdio management data input output for configuration and control of standard. Page 1 of 8 reduced gigabit media independent interface rgmii 12102000 version 1. They all feature a mode of operation supporting ieee. Media independent interface mii and reduced gigabit media independent interface rgmii to the physical layer. Gigabit ethernet transceiver with gmiimii support with low power features.
Reduced gigabit media independent interface rgmii opencores. The rgmii standard achieves this by reducing parallel data bus width and through double data rate ddr. The gigabit media independent interface gmii is the interface available to all supported device families. To further reduce pcb trace complexity, the rtl8211n8212n also provides an innovative 2. The gigabit ethernet media access controller ip is compliant with the ethernet ieee 802. Each of the two independent transceivers features an industrial standard gmii, mii, and rgmii reduced gigabit media independent interface. 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. The siliconproven gigabit ethernet ip core provides a 10100 mbps media independent interface mii and a mbps gigabit media independent interface gmii. 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.
The main issues are that 10gigabit ethernet is optimized for data and that it does not provide builtin quality of services. Sgmii is defined as serial gigabit media independent interface somewhat frequently. Gigabit media independent interface gmii is an interface between the media access control mac device and the physical layer. Ethernet quad serial gigabit media independent interface qsgmii ip. Ethernet quad serial gigabit media independent interface. Rgmii to gmii bridge april 2005 reference design rd1022 introduction 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. Integrated 5port 10100managed ethernet switch with gigabit gmii. Figure 2 shows two examples of a gigabit ethernet line card with an intel fpga connected by the sgmii interface to a 10100 mbps or gigabit ethernet sfp pluggable module with lvds ios and serial transceivers, respectively. I am a member of the applications support team and have worked on several customer tickets inquiring about various products and. The gigabit media independent interface gmii is an interface between the medium access control mac device and the physical layer. The mdio interface is necessary for the operation of the core because the. Gmii gigabit mediaindependent interface 8bit wide data interface operating at 125mhz. The gigabit mediaindependent interface gmii is an interface between the medium access control mac device and the physical layer. Page 2 of 9 revision level date revision description 1.
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