IPR-ED8B10B【PDF 1/11 页】IP 8B10B ENCODER/DECODER RENEW

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8b10b Encoder/Decoder

MegaCore Function

(ED8B10B)

November 2001; ver. 1.02

Introduction

Data Sheet

Encoders and decoders are used for physical layer coding for Gigabit

Ethernet, Fibre Channel, and other applications. The 8b/10b encoder

takes byte inputs, and generates a direct current (DC) balanced stream

(equal number of 1s and 0s) with a maximum run length of 5. Some of the

individual 10-bit codes will have an equal number of 1s and 0s, while

others will have either four 1s and six 0s, or, six 1s and four 0s. In the latter

case, the disparity between 1s and 0s is used as an input to the next 10-bit

code generation, so that the disparity can be reversed, and maintain an

overall balanced stream. For this reason, some 8-bit inputs have two valid

10-bit codes, depending on the input disparity.

The Altera ? 8b10b Encoder/Decoder MegaCore ? Function (ED8B10B) is a

compact, high performance core capable of encoding and decoding at

Gigabit Ethernet rates (125 MHz: 1 Gbps). The ED8B10B is optimized for

the APEX TM 20K, FLEX 10K ? , and Mercury TM devices.

Features

Look-up table (LUT)-based implementation of encoder

Industry compatible special character coding

Complies with all applicable standards, including:

– Institute of Electrical and Electronics Engineers, IEEE 802.3z,

Media Access Control (MAC) Parameters, Physical Layer, Repeater

and Management Parameters for 1000 Mb/s Operation, 1998,

paragraphs 36.2.4.1 to 36.2.4.6.

Quartus ? II software, and OpenCore ? feature allow place-and-route

and static timing analysis of designs prior to licensing

Secure register transfer level (RTL) simulation models allow

simulation with user design in third-party simulators

Functional

Description

Altera Corporation

A-DS-IPED8B10B-1.02

The ED8B10B can encode one 8-bit byte of data into a 10-bit transmission

code, and decode a 10-bit code into one 8-bit byte of data. Figure 1

illustrates the bidirectional conversion process.

The eight input bits are named A , B , C , D , E , F , G , H . Bit A is the least

significant bit (LSB), and bit H is the most significant bit (MSB). They are

split into two groups: The five-bit group A , B , C , D , E , and the three-bit

group F , G , H .

The coded bits are named a , b , c , d , e , i , f , g , h , j (the order is not

alphabetical). These bits are also split into two groups: the six-bit group a ,

b , c , d , e , i , and the four-bit group f , g , h , j .

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