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DM9081F

10BASE-T Hub Controller

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Table of Contents

General Description....................................................... 1

Block Diagram .............................................................. 1

Table Of Contents.......................................................... 2

Features......................................................................... 3

Pin Configuration .......................................................... 3

Pin Description.............................................................. 4

Functional Description .................................................. 6

T Repeater function ....................................................... 6

T Signal Regeneration ................................................... 6

T Collision Function...................................................... 6

T Auto Partition/Reconnection ...................................... 6

T Fragment Extension ................................................... 6

T Link Integrity Test ..................................................... 6

T Jabber Lockup Protection ........................................... 7

T Reset .......................................................................... 7

T Expansion Port........................................................... 7

T External Logic ........................................................... 8

T LED Functions........................................................... 9

T Collision Status.......................................................... 9

T AUI1 Port Status ........................................................ 9

T AUI2 Port Status ........................................................ 9

T Minimum Mode ......................................................... 9

T TP Port Status ............................................................ 9

T Normal Mode........................................................... 10

T LED Latch ............................................................... 10

T AUI Ports Status ...................................................... 11

T TP Ports Bit Rate Error Status .................................. 11

T TP Ports Jabber Status.............................................. 11

DM9081

T TP Ports Partition Status ...........................................11

T Traffic Status............................................................11

T TP Port Link Status ..................................................11

T DM9081 Chip External Components ........................12

Absolute Maximum Ratings.........................................13

DC Electrical Characteristics .......................................13

AC Characteristics .......................................................14

Timing Waveforms

T Expansion Port Input Timing ...................................15

T Expansion Port Output Timing .................................15

T Expansion Port Collision Timing..............................16

T AUI Transmit Timing...............................................16

T AUI Receive Timing.................................................17

T AUI Collision Timing...............................................17

T Transmit Timing ......................................................17

T Receive Timing ........................................................18

T Link Integrity Timing...............................................18

Layout Recommendation

T Decoupling ...............................................................19

T Power Plane..............................................................19

Package Information ....................................................21

Ordering Information ...................................................22

Company Overview......................................................22

Contact Windows.........................................................22

2

Final

Version: DM9081-DS-F01

April 22, 1997

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