To make the system can be work in high speed, we use a lot of technology such as pipeline strategy, optimization of complicated logics and parallel descrambler. Clause 119 is typically considered a 64b66b spinoff of clause 91. The aurora 64b66b core provides the logic needed to use gtxgth transceivers, with minimal fpga resource cost. Sep 4, 2008 peterj slide 1 8b10b coding 64b66b coding 1. In addition, clause 108 defines reedsolomon codes for a 25gbps mac, while. There are no additional ordered sets added by 10gepon.
The 10gbe physical layer uses 64b66b encoding to reformat a packet before transmits the packet over the physical medium. At the time 64b66b was deployed, it allowed 10 gb ethernet to be transmitted with the same lasers used by sonet oc192, rather than. Kernel, drivers and embedded linux development, consulting, training and support 1640. Sep 4, 2008 peterj slide 3 flip flop d c q transmission system propagation delay clock data unequal. The 64b66b encoding offers theoretical improved performance because of its very low 3% transmission overhead, compared to 25% overhead for 8b10b encoding. The ethernet frame is a data link layer, while the 64b 66b encoding is part of the physical layer more precisely the pcs of the physical layer the physical layer doesnt know anything about the start of a frame.
Two consecutive pam16 levels on each lane represent one twodimensional symbol. The 64b 66b signal encoding technique is used in 10 gigabit ethernet systems such as 10gbaser and 10gbasew as mentioned. Implements a 320bit cgmii interface operating at 312. Phypcs data coded in 64b66b is transcoded to 256b257b to allow for the addition of fec in 200400gbaser implementations. This is a considerable improvement on the 80% efficiency of the previouslyused 8b10b encoding scheme, which added 2 coding bits to every 8 payload bits.
The 10gbasex still uses 8b10b encoding because all of the 2. Using a different approach than 8b10b encoding, 64b66b encoding can accomplish similar tasks. In data networking and transmission, 64b66b is a line code that transforms 64bit data to 66bit. Questions tagged ethernet electrical engineering stack. Test code consists of pcie tlp packets reading and writing tests, ethernet tcpudp packets reading and writing tests, equipment switching test. This download record includes the i40e linux base driver version 2. Page 1 the 10gbps 32bit ethernet ip solution offers a fully integrated ieee802. Intel ethernet drivers and utilities list edevel archives. The ip is free to use from the ip catalog on xilinx silicon devices. The 10gbaser uses a 64b 66b encoding system that raises the 10 gigabit ethernet line rate fr om a nonencoded 9. In addition, clause 108 defines reedsolomon codes for a.
Aurora is a logicore ip designed to enable easy implementation of xilinx transceivers while providing a lightweight user interface on top of which designers can build a serial link. Highspeed serial buses send encoded data that contains both data and clocking information. The start of an ethernet frame are data bytes which contain the preamble. Pmd physical interface driver physical interface driver physical interface driver. Implements 64b 66b encoding decoding for transmit and receive pcs. This clause specifies the physical coding sublayer pcs for ethernet operation over electrical backplanes that. The intellectual property ip core provides access to this hard ip at data rates of 10 gbps, 25 gbps, and 100 gbps. The 64b66b encoding offers improved performance because of its very low 3% transmission overhead, compared to 25% overhead for 8b10b encoding.
The 10gbaser uses a 64b66b encoding system that raises the 10 gigabit ethernet line rate fr om a nonencoded 9. Number of lanes per link for baset, number of twisted pairs used. Implements 64b66b encodingdecoding for transmit and receive pcs. A highspeed 64b66b decoder for serdes system was designed in tsmc 0. Intel stratix 10 fpga etile hard ip for ethernet intel fpga ip. Although the aurora 64b 66b core is a fullyverified solution, the challenge. The chip is composed of block sync, descrambler, decode process and receive control. On the transmit path, the physical layer encodes every 64bit from an ethernet frame into a 66bit block, which consists of a two bit synchronization header and a 64bit payload. Currently, i get 2 bit header and corresponding 64 bit descrambled payload at positive edge of every other clock cycle. Patentviewep13123 64b66b coding for packetized serial data englisch.
Ethernet is now used for block alignment and error handling. The aurora 64b 66b core can support a maximum of two symbols skew in the receive of a multilane channel. Implements 64b66b encodingdecoding for transmit and receive pcs implements 40g100g scramblingdescrambling using 802. The aurora 64b 66b core can support a maximum of two symbols skew in the receipt of a multilane channel. Aurora 64b66b uses standard 64b66b encoding, which is the preferred encoding scheme for 10gigabit ethernet making it compatible with many existing hardware standards for cables and. The aurora 64b66b core can support a maximum of two symbols skew in the receipt of a multilane channel. Aurora 64b 66b uses standard 64b 66b encoding, which is the preferred encoding scheme for 10 gigabit ethernet, making it compatible with many existing hardware standards for cables and backplanes. Aurora 64b66b is a version of the protocol using 64b66b encoding instead of 8b10b. It supports 64b66b encodingdecoding for transmit and receive, and various data rates ranging from 10g to 400g. The encoder 100 applies 64b66b encoding to blocks composed of two quads of the input data consecutively received from the pseudoxgmii bus 42, i. Not all possible 256 symbols are used, but they are selected from 128 maximally spaced combinations dsq128. Unless changes to 64b 66b operation are required, we could reuse it through reference to clause 49 less work, less debugging, existing and tested.
The physical medium ranges from bulky coaxial cable to twisted pair and optical fiber with a standardized reach of up to 40 km. Examples of code for 64b 66b transmit 3 representation of invalid code f07070707 f07070707 8 fb d 1 d 2 d 3 0 d 4 d 5 d 6 d 7 0 d 0 d 1 d 2 d 3 1 07d 1 d 2 d 3 f07070707. Youre talking about 10gbaset most other 10g flavors use straight 64b 66b. Because of its acceptable run length and low overhead, the 64b 66b encoding is also a candidate encoding scheme for high speed intershelf, chiptochip. To reduce the overhead, 64b 66b encoding was created. Highspeed serial explained national instruments ftp server. Thus, the 64b66b coding uses 66 bits to represent the 64 received bits. Because of its acceptable run length and low overhead, the 64b66b encoding is also a candidate encoding scheme for high speed intershelf, chiptochip, and backplane interconnections.
The 64b 66b encoding offers improved performance because of its very low 3% transmission overhead, compared to 25% overhead for 8b10b encoding. Aurora 64b66b is a lightweight and open protocol suitable for chiptochip, boardtoboard and backplane applications using very high speed transceivers. Opensilicon expands networking ip portfolio to address. Introduction connectx5 infinibandvpi mellanox docs. Receive direction 64bto66b gearbox, 66bit word aligner and 64b66b decoder. A hardware implementation of 64b66b encoderdecoder is introduced, which. Xilinx xapp687 64b66b encoder decoder application note. Introduction to 10 gigabit 64b66b clause 49 sowmya s. Ieee802 plenary july 2006 10gbasekr fec tutorial fec block format payload words carry the 10gbaser scrambled payload words tn transcode bit carries the state of the 10gbaser sync bits for the associated payload word sync bits are compressed to single bit then scrambled to ensure dc balance 64b66b sync bits are either 10 or 01 hence can be reconstructed from the t bit. Aurora 64b66b can be scaled, both in line rate and channel width, to allow inexpensive legacy. Implements 64b 66b encoding decoding for transmit and receive pcs implements 40g100g scramblingdescrambling using 802.
The physical layer defines the electrical or optical properties of the physical connection between a device and the network or between network devices. Hardware implementation of 64b66b encoderdecoder for. Sync header is also used in various ethernet phys to. This enables engineers to decode 64b 66b data and link training data in less than 30 seconds. Here 64b stands for 64 bits block of data and 66b stands for 66 bits block of data. Our standalone board driver consists of pcie and ethernet device driver, drp control module driver and dma driver. Highspeed serial interface achieved using a lightweight protocol ion 64b66b is an ip for highspeed serial interface targeting applications with interchip and interboard connections. Aurora 64b66b uses standard 64b66b encoding, which is the preferred encoding scheme for 10gigabit ethernet making it compatible with many existing hardware standards for cables and backplanes. The 64b66b signal encoding technique is used in 10 gigabit ethernet systems such as 10gbaser and 10gbasew as mentioned. D9010ekrp 10g100gbasekr 64b66b and link training decode. Youre talking about 10gbaset most other 10g flavors use straight 64b66b. It is complemented by the mac layer and the logical link layer. The aurora 64b66b core can support a maximum of two symbols skew in the receive of a multilane channel. Error correction on 6466 bit encoded links ieee conference.
It includes a suite of configurable protocollevel searches and softwarebased triggering specific to 64b66b and link training of ethernet technologies such as 100gbasekrcr. Page 2 optional prevention of crc appending in frame data by mac to allow crc to be preembedded in frame data by user application. The ethernet physical layer is the physical layer functionality of the ethernet family of computer network standards. Aurora 64b 66b is a scalable, lightweight, linklayer protocol for highspeed serial communication. The softwareis combines both a 64b 66b decoder and a link training decoder. Ottawa, on may 23, 2000 64b66b coding update ieee 802. The ethernet physical layer has evolved over its existence starting in 1980 and encompasses multiple physical media interfaces and several orders of magnitude of speed from 1 mbits to 400 gbits. The encoding and decoding rules of 64b66b and inherent characteristic among 64b66b codes are studied in this paper. In general, network protocol stack software will work similarly on all. Ultralow latency 10g ethernet ip solution product brief htkull10geth32fpga revision 1. The intel stratix 10 fpga etile incorporates a configurable, hardened ethernet protocol stack that is compatible with the ieee 802. The softwareis combines both a 64b66b decoder and a link training decoder. A standard infiniband data rate, where each lane of a 4x port runs a bit rate of 25. Describe the block encoding used by the pcs i basex.
The ethernet frame is a data link layer, while the 64b66b encoding is part of the physical layer more precisely the pcs of the physical layer the physical layer doesnt know anything about the start of a frame. Comcores physical coding sublayer pcs ip core for cpri 7. Ion 64b66b ip 64b66b highspeed serial interface mpression. Implementing the ethernet standard 10gbaser phy functions. Interface with the highspeed line interface block embedded in the orli10g which implements an oif standard oif 99. The mac to phy data rate for both lan phy versions is 10 gbs. Lightweight link layer protocol provides onetoone data movement via one or more highspeed serial lanes. The ethernet pcs ip is compatible with different mii interfaces for connecting to the mac and works with offtheshelf mac and serdes. The 10gbe physical layer uses 64b 66b encoding to reformat a packet before transmits the packet over the physical medium. It includes a suite of configurable protocollevel searches and softwarebased triggering specific to 64b 66b and link training of ethernet technologies such as 100gbasekrcr.
Transmit direction 64b66b encoder and 66bto64b gearbox. The 64b 66b encoding offers theoretical improved performance because of its very low 3% transmission overhead, compared to 25% overhead for 8b10b encoding. Aurora 64b 66b can be scaled, both in line rate and channel width, to allow inexpensive legacy. The overhead of 64b 66b encoding is 2 coding bits for every 64 payload bits or 3. Us6650638b1 decoding method and decoder for 64b66b. Using the above picture as an example, we are encoding 64bits worth of data using. Although the aurora 64b66b core is a fullyverified solution, the challenge.
Us6650638b1 decoding method and decoder for 64b66b coded. This enables engineers to decode 64b66b data and link training data in less than 30 seconds. Xilinx sp011 aurora 64b66b protocol specification, standards. Aurora is typically used in applications requiring lowcost, high datarate, scalable and flexible means to build a serial data channel. For example in 10gbaser xgmii sublayer provides 64 bits of data to pcs sublayer. Aurora 64b66b is a scalable, lightweight, linklayer protocol for highspeed serial communication. The overhead of 64b66b encoding is 2 coding bits for every 64 payload bits or 3.
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