dp83950b National Semiconductor Corporation, dp83950b Datasheet

dp83950b

Manufacturer Part Number

dp83950b

Description

Dp83950b Rictm Repeater Interface Controller

Manufacturer

National Semiconductor Corporation

Datasheet

1.DP83950B.pdf (80 pages)

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C 1995 National Semiconductor Corporation

DP83950B RIC

Repeater Interface Controller

General Description

The DP83950B Repeater Interface Controller ‘‘RIC’’ may be

used to implement an IEEE 802 3 multiport repeater unit It

fully satisfies the IEEE 802 3 repeater specification including

the functions defined by the repeater segment partition and

jabber lockup protection state machines

The RIC has an on-chip phase-locked-loop (PLL) for Man-

chester data decoding a Manchester encoder and an Elas-

ticity Buffer for preamble regeneration

Each RIC can connect to 13 cable segments via its network

interface ports One port is fully AUI compatible and is able

to connect to an external MAU using the maximum length of

AUI cable The other 12 ports have integrated 10BASE-T

transceivers These transceiver functions may be bypassed

so that the RIC may be used with external transceivers for

example DP8392 coaxial transceivers In addition large re-

peater units containing several hundred ports may be con-

structed by cascading RICs together over an Inter-RIC bus

The RIC is configurable for specific applications It provides

port status information for LED array displays and a simple

interface for system processors The RIC posseses multi-

function counter and status flag arrays to facilitate network

statistics gathering A serial interface known as the Man-

agement Interface is available for the collection of data in

Managed Hub applications

Features

1 0 System Diagram

TRI-STATE is a registered trademark of National Semiconductor Corporation

RIC

Compliant with the IEEE 802 3 Repeater Specification

13 network connections (ports) per chip

Selectable on-chip twisted-pair transceivers

Cascadable for large hub applications

Compatible with AUI compliant transceivers

On-chip Elasticity Buffer Manchester encoder and de-

coder

and SONIC

are trademarks of National Semiconductor Corporation

TL F 11096

Simple RIC Hub

Table of Contents

1 0 SYSTEM DIAGRAM

2 0 CONNECTION DIAGRAM

3 0 PIN DESCRIPTIONS

4 0 BLOCK DIAGRAM

5 0 FUNCTIONAL DESCRIPTION

6 0 HUB MANAGEMENT SUPPORT

7 0 PORT LOGIC FUNCTIONS

8 0 RIC REGISTER DESCRIPTIONS

9 0 AC AND DC SPECIFICATIONS

10 0 AC TIMING TEST CONDITIONS

11 0 PHYSICAL DIMENSIONS

Separate partition state machines for each port

Provides port status information for LED displays in-

cluding receive collision partition and link status

Power-up configuration options

Repeater and Partition Specifications Transceiver Inter-

face Status Display Processor Operations

Simple processor interface for repeater management

and port disable

On-chip Event Counters and Event Flag Arrays

Serial Management Interface to combine packet and

repeater status information together

CMOS process for low power dissipation

Single 5V supply

RRD-B30M16 Printed in U S A

October 1995

TL F 11096 – 1

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