COM20020 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

MFG CO.

COM20020

COM20020 3.3V ULANC Universal Local Area Network Controller with 2K x 8 On-Board RAM

SMSC -> Microchip 

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XTAL1

XTAL2

AD0-

ALE

A15

RESET

nRD

nWR

nINT1

8051

RXIN

TXEN

nPULSE

nPULSE

GND

BACKPLANE

FIGURE

COM20020

AD0-AD2, D3-

A2/BAL

nCS

nRESET

nRD/nD

nWR/DI

nINTR

RXIN

nTXEN

nPULSE

nPULSE

GND

LTC1480 or

Equiv.

Differential

Configuratio

A0/nMU XTAL1 XTAL2

27 pF

20 MHz

XTAL

27 pF

* Media

may be

with Figure A, B or

+3.3V

100

+5V

RXIN

3.3V-5V Converter

2 Receive

6 HFD3212-

7

nPULSE

Transmitte

3 HFE4211-

+5V

2

6

7

2 Fiber

(ST

NOTE: COM20020 must be in backplane mode

FIGURE

FIGURE 2 - MULTIPLEXED, 8051-LIKE BUS INTERFACE WITH RS-485 INTERFACE

14

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