Datasheet

31-Oct-2005

Order Number: 248989, Revision: 003

3

Contents

1.0

LXT914 Pin Assignments and Signal Descriptions....................................................................7

2.0

Functional Description................................................................................................................ 14

2.1

Introduction ......................................................................................................................... 14

2.2

External Interfaces .............................................................................................................. 14

2.2.1

10BASE-T Ports .................................................................................................... 14

2.2.2

AUI Port ................................................................................................................. 14

2.2.3

Serial Port .............................................................................................................. 14

2.2.4

Inter-Repeater Backplane ...................................................................................... 15

2.2.4.1

Synchronous IRB Operation ..................................................................15

2.2.4.2

Asynchronous IRB Operation ................................................................ 15

2.3

Internal Repeater Circuitry ..................................................................................................15

2.4

Initialization ......................................................................................................................... 16

2.4.1

Local Management Mode Initialization ..................................................................16

2.4.2

External Management Mode Initialization .............................................................. 19

2.5

10BASE-T Port Operation .................................................................................................. 20

2.5.1

10BASE-T Reception............................................................................................. 20

2.5.1.1

Programmable Internal Squelch Level ................................................... 21

2.5.1.2

Polarity Detection and Correction .......................................................... 21

2.5.2

10BASE-T Transmission ....................................................................................... 21

2.5.3

10BASE-T Link Integrity Testing............................................................................ 21

2.6

AUI Port Operation ............................................................................................................. 22

2.6.1

AUI Reception........................................................................................................22

2.6.2

AUI Transmission .................................................................................................. 22

2.6.3

AUI Mode Selection (DTE/MAU)............................................................................ 22

2.7

Collision Handling ...............................................................................................................23

2.8

Security Mode ..................................................................................................................... 23

2.9

LED Display ........................................................................................................................ 23

3.0

Application Information .............................................................................................................. 27

3.1

Layout Requirements..........................................................................................................27

3.1.1

The Twisted Pair Interface .....................................................................................27

3.1.2

The RBIAS Pin....................................................................................................... 27

3.2

12-Port Hub Repeater.........................................................................................................27

3.3

8-Port Print or File Server ................................................................................................... 28

4.0

Test Specifications ......................................................................................................................35

5.0

Package Specifications...............................................................................................................40

5.1

Top-Label Marking .............................................................................................................. 42

6.0

Product Ordering Information .................................................................................................... 44