Datasheet > 8B10B

8B10B

更新时间： 2024-10-01 06:33:39

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8b10b Macro

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8B10B 数据手册

v2.0

8b10b Macro

Product Summary

into a 10-bit code that contains an equal number of 0’s and

1’s. In addition, the code is built so that no more than five

consecutive 0’s or 1’s are ever transmitted. The 8b10b macro

is designed to work with a variety of standard transceiver

devices. A set of generic signals provides a data and command

interface with the system logic. A system-level block diagram

describing the use of the 8b10b macro is shown in Figure 1.

• Gigabit Ethernet 8b10b Function

• 125 MHz Operation

• Transmit and Receive Function

• Disparity and Illegal Code Error Checking

• Connects directly to industry-standard Gigabit Ethernet

Transceiver devices.

The 8b10b macro provides a user interface and a transceiver

interface. The user interface consists of transmit data,

receive data, and several control and status signals used to

qualify the data. To simplify the timing of the user interface,

the data transmission is word-wide (16-bits) and operates at

62.5 MHz. This strategy provides a simplified timing interface

for system logic yet still meets the 125 megabyte per second

requirements for Gigabit Ethernet.

• Supports either single or dual channel transceiver in a

single device.

Version

This data sheet defines the functionality of Version 1.0 of the

8b10b macro.

General Description

The transceiver interface is designed to connect directly to

most commercially-available Gigabit Ethernet transceiver

devices. The transceiver is responsible for serializing

transmit data and deserializing receive data. In addition, the

receiver is designed to resynchronize the serial stream

whenever an external device detects illegal coding errors.

The 8b10b macro implements the function for the physical

coding sublayer for Gigabit Ethernet as defined in the IEEE

802.3z specification. The 8b10b is a marriage of two

sub-blocks, the 5b6b and the 3b4b encoder/decoders

(ENDECs). The purpose of the ENDEC is to convert 8-bit data

8b10b Macro

Transmitter

TRANSCEIVER

TX_WORD[15:0]

TX_DATA[9:0]

SERIAL_TX

TX_K_CHAR[1:0]

TX_WRn

INVALID_K

CLK125

RSTn

RX_DATA[9:0]

COMMA_DETECT

RBC0

Receiver

RX_WORD[15:0]

SERIAL_RX

RX_K_CHAR[1:0]

CODE_ERRORn[1:0]

RBC1

WORD_SYNCn

RX_CLK

COMMA_DET_EN

Figure 1 • System Block Diagram Depicting 8b10b Macro Usage

May 2000

12 3 4 5 6 7...12

中文翻译

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