It uses differential pairs at 625 mhz clock frequency ddr for tx and rx data and tx and rx clocks. Hello, im trying to have the zynq gem1 ethernet interface go through the pl via the emio and then convert the resulting gmii interface to rgmii via the gmii to rgmii core. Rgmii, sgmii,xaui the media independent interface mii is a standard interface used to connect a fast ethernet i. See the complete profile on linkedin and discover sanghoons. 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.
Logicore ip gigabit media independent interface gmii to reduced gigabit media independent interface rgmii rgmii phy. As an example for how one driver implemented an mdio bus driver, see. Other ethernet communications interfaces such as tbi, rgmii v2. Latticescmarvell serialgmii sgmii lattice semiconductor physical layer interoperability figure 4. The mediaindependent interface mii was originally defined as a standard interface to connect. Rgmii interface timing considerations ethernet fmc. The core can be instantiated, synthesized and simulated through diamond and radiant design software. The ksz9897 is a fully integrated layer 2, managed, sevenport gigabit ethernet switch with numerous advanced features. Implementation of one triplespeed ethernet ip core instance supporting 10100mbps ethernets operations with rgmii or sgmii with autonegotiation. There are 4 rgmii phymodes used describe where a delay should be applied. Supports 10100mbps speed in sgmii mode with pcspma ip cores from intel. When gmii rgmii sgmii interfaces are used, the fpga requires an exact 125 mhz clock to drive the mbitss communication.
Rgmii requires special rx andor tx delays depending on the actual hardware circuitwiring. Sgmii the serialgmii sgmii interface is an alternative to gmiimii. As an example, lattice has developed a reference design for a complete sgmiitogmii bridge. Some interested parties businesses brought together and prepared a specification a type of technical. When the emac is routed into the fpga it is exposed as a miigmii interface so this design also adapts the exposed interface to rgmii before it is. Configuring sgmii ethernet on the powerquicc mpc83e. Ive just noticed that the mdio bus mdio, mdc is part of the rgmii protocol and is used for device config and monitoring. Sathaps, ive been playing with this the last couple days, and there is a pg160, product guide for the core that has a good diagram of the reset circuit.
Gige triplespeed ethernet mac 8bit core with gmiirgmii. Negotiation between mdio and sgmii pcs i supports 10100 mii or rgmii operation with sgmii running at the same rate i configurable for 10100 mii dte or dce modes i. Gmii to rgmii parameters table 2 shows the features that are parameterizable in the gmii to rgmii ip. For gigabit speeds, the gmii g for gigabit interface is used, with a reduced pincount version called rgmii. Clarification on ethernet, mii, sgmii, rgmii and phy stack overflow.
Configuring sgmii ethernet on the powerquicc mpc83e processor. Phy abstraction layer the linux kernel documentation. The alaska virtual cable tester software gui controls the 88e111188e1112 parts and monitor status bits. The mdio interface is necessary for the operation of the core because the. Sgmii serial gigabit mediaindependent interface sgmii. The 101001g ethernet verification ip is compliant with ieee 802. The mii may connect to an external transceiver device via a pluggable connector see photo or simply connect two chips on the same printed circuit board. If you are using the ethernet fmc, the phy is the marvell 88e1510, and the ethernet mac is inside the fpga. One external mac port with sgmii one external mac port with rgmii miirmii rgmii v2.
Electrical engineering stack exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Actually, i found that the is usually a mdio between mac and phy with sgmii. The sgmii link consists of a single serdes lane running at a fixed bit rate of 1. Supports only mbps speed with gmii rgmii pcs side interface. This is used for cisco sgmii, which is a modification of basex as defined by the 802. The tsn end node ip core from nettimelogic is a standalone time sensitive networking tsn single. The mii was standardised a long time ago and supports 100mbitsec speeds. This clock is derived from the user supplied external clock using the clock module or pll. It interfaces directly to twisted pair media through an external transformer. The use of rxclk is optional, and the mpc83e mac can extract the clock from the recovered data stream.
The programmable 10100100 ethernet mac provides, with a single ip core, a solution for ethernet applications line card, nic card or switching operating at 10100 or mbps gigabit ethernet. The methods in this document describe how to set up an rgmii specific timing budget and determine. Rgmii was born the same way the original ethernet was. Rgmii is a 12pin interface, while sgmii can operate as either a four or sixpin interface. Lowpower, robust gigabit ethernet phy transceiver with sgmii. Browse other questions tagged ethernet mac phy rgmii sgmii or ask your own question.
Max24287 1gbps paralleltoserial mii converter microsemi. I designed the 1g lan port with ksz9031, but there is a problem with getting the ip. Although it is completely ok to route the mdio directly to the external phy, its probably better to route it through the gmiitorgmii core as shown in the product guide because for there is a register contained in the core that must be written to through the mdio bus. It is used for gigabit ethernet but can also carry 10100 mbits ethernet.
Veriphy link cable diagnostics software suite automatic detection and correction of cable pair swaps, pair skew and pair polarity, along with hp auto mdimdix crossover function manufactured in advanced 0. Ps and plbased 1g10g ethernet solution application note xilinx. In sgmii mode, the device interfaces directly to ethernet switch ics, asic macs. Rgmii interface timing budgets is intended to serve as a guideline for developing a timing budget when using the rgmii v1. The rgmii standard achieves this by reducing parallel data bus width and through double data rate ddr. The rgmii interface is routed through mio pins to interface with an external rgmii phy. When the emac is routed into the fpga it is exposed as a miigmii interface so this design also adapts the exposed interface to sgmii before it is connected to fpga io. Mdio mdc and gclkin in also matched together, i looked to openrex board, all is same as schematic, but i dont know why the chip does not work. Gige triplespeed ethernet mac 8bit core with gmiirgmiisgmii.
This reference design is included with the sgmii and gb ethernet pcs ip core package and is described in detail in appendix c. A version using less pins is also available, rmii r for reduced. This device interfaces directly to the mac layer through reduced gmii rgmii or embedded clock serial gmii sgmii. Supports only mbps speed with gmiirgmii pcs side interface. Gmii, rgmii and mii serial to parallel conversion and decoding. Microprocessor interaction is optional for device operation. Added note that rgmii datatoclock skews for 10100mbps speeds are looser than for mbps speed. The parallel interface can be configured for gmii, rgmii, tbi, rtbi, or 10100 mii, while the serial interface can be configured for 1. Selectable mdcmdio interface or twowire serial interface.
Mdio pins are independent of the media independent interface gmii, rgmii, mii, sgmii. Clarified register description for software powerdown bit register 0h, bit 11. The serial gigabit media independent interface sgmii is a connection bus. Management data inputoutput mdio, also known as serial management interface smi or media independent interface management miim, is a serial bus defined for the ethernet family of ieee 802. As an example, lattice has developed a reference design for a complete sgmii togmii bridge. Rgmii achieves a 50 percent reduction in the pin count, compared with gmii, and for this reason is preferred over gmii by pcb designers. Marvell 88e1112 64 qfn evaluation board marvell alaska virtual cable tester software the alaska virtual cable tester software gui controls the 88e111188e1112 parts and monitor status bits.
Realtek pci gbe ethernet family controller software. These delays can be added by the mac, the phy or the designer of the circuit the latter means that no delay has to be added by phy or mac. Although the hps emac supports rgmii, you can route the emac to the fpga in order to reuse the hps io for other peripherals. The other two ports have interfaces that can be configured as sgmii, rgmii, mii or rmii. The 10100 mbs modes uses only 4 out of the 8 data bits and mbs mode uses all 8 data bits. Corergmii is responsible for providing the interface between a standard gigabit media independent interface gmii to rgmii conversion. Reduced gigabit media independent interface can be abbreviated as rgmii definition of rgmii rgmii stands for reduced gigabit media independent interface. This is achieved with the use of doubledatarate ddr flipflops. Zynqmp, ti dp83867 on mdio emio, sgmii gem through psgtr issue looks like the phy is getting read correctly over the mdio. Five of the seven ports incorporate 10100 mbps phys.
A very reduced pincount version called sgmii is also available s for serial which. Dp83822if hi guys, im hoping to use the dp83822if to interface between my rj45 twisted pair ethernet bus and the zynq7020 rgmii mac layer. Evm has connections to use the dp83869 mac inerface in rgmii and sgmii mode. It is used by the core during register write operation. Introducing gmii to rgmii in the device tree community forums. For more information on the mdio module, see fil io. The ksz9567 is a fully integrated layer 2, managed, sevenport gigabit ethernet switch with numerous advanced features. The dp83867 is designed for easy implementation of 10100 mbps ethernet lans. Sgmii master and basex autonegotiation without software involvement. You would normally route these straight to the phy and not through the gmii to rgmii block. The max24287 performs automatic translation of link speed and duplex autonegotiation between parallel mii mdio and the serial interface. Either of these may connect directly to a host processor or to an external phy. The parameters are based on the rgmii gigabit mii interface and adapted to automotive requirements. Ps and plbased 1g10g ethernet solution application note.
Special clock frequency requirement for gmii rgmii sgmii interface. The principle objective of rgmii is to reduce the number of pins from 22 down to 12 in. And from a software perspective all you need to do is to install the driver in windows or configure the linux kernel to include the driver for your. The rgmii interface is the physical connection between the ethernet phy and the ethernet mac. If your connecting the max24287 to a processor, then you need to connect the mdio to both the max24287 and the phy as shown below and configure the registers on both. View sanghoon lees profile on linkedin, the worlds largest professional community. Altera gmiitorgmii ip core semiconductor ip silicon ip. Oct 22, 2017 the serial gigabit media independent interface sgmii is a popular gigabit ethernet phy interface, and it holds various advantages over both gmii and rgmii. 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. Sanghoon lee lead software tme cavium inc linkedin. May 15, 2018 the 100mbps versions of the mii 15pin mii and ninepin reduced mii rmii are complemented by 1gbps versions, which include reduced gigabit mii rgmii and serial gigabit mii sgmii. The 100mbps versions of the mii 15pin mii and ninepin reduced mii rmii are complemented by 1gbps versions, which include reduced gigabit mii rgmii and serial gigabit mii sgmii. Max24287 1gbps parallel to serial mii converter general description the max24287 is a flexible, lowcost ethernet interface conversion ic. Statistics counter block for rmon and mib mdio cores for external phy statuscontrol.
This allows users to obtain a customized gmii to rgmii design for their system. Hardwareconfigured modes support sgmii master and basex autonegotiation without software involvement. In sgmii mode, the device interfaces directly to ethernet switch ics, asic macs, and baset electrical sfp modules. The ksz9893rnx is built upon industryleading ethernet te chnology, with features designed to offload host processing. Negotiation between mdio and sgmii pcs supports 10100 mii or rgmii operation with sgmii running at the same rate configurable for 10100 mii dte or dce modes i.
Title open alliance rgmii epl electricalphysical layer recommendations version v2. Since the hps emac only supports rgmii when hps io are used, you can route the emac to the fpga in order to support sgmii phys. The serial gigabit mediaindependent interface sgmii is a variant of mii, a standard interface used to connect an ethernet mac block to a phy. The serial gigabit media independent interface sgmii is a popular gigabit ethernet phy interface, and it holds various advantages over both gmii and rgmii.
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. Max24287 1gbps paralleltoserial mii converter microchip. 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. The reference designs offer the following features. The problem lies in the programming of the autonegotiated speed. Texas instruments dp83867irpap ethernet rgmii phy device through the reduced gigabit. Review of ethernet sgmii concepts mind chasers inc. Mdio mdc processing system programmable logic gt si570 tcpip stack ps ethernet driver standard networking application software driver for linux linux image sfp device tree 125 mhz x186510317.
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