COM20022I Ver la hoja de datos (PDF) - SMSC -> Microchip

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COM20022I

10Mbps ARCNET controller with 2Kx8 on-board RAM

SMSC -> Microchip 

XTAL1

XTAL2

AD0-AD7

ALE

A15

RESET

nRD

nWR

nINT1

8051

COM20022

AD0-AD2, D3-D7

A2/BALE

nCS

nRESET

nRD/nDS

nWR/DIR

nINTR

RXIN

nTXEN

nPULSE1

nPULSE2

GND

75176B or

Equiv.

Differential Driver

Configuration

A0/nMUX XTAL1 XTAL2

27 pF

20 MHz

XTAL

27 pF

*Media Interface

may be replaced

with Figure A, B or C.

RXIN

TXEN

nPULSE1

nPULSE2

GND

+5V

100 Ohm

BACKPLANE CONFIGURATION

FIGURE A

RXIN

+5V

2

6 Receiver

HFD3212-002

7

nPULSE1

+5V

Transmitter

3 HFE4211-014

2

6

7

2 Fiber Interface

(ST Connectors)

NOTE: COM20022 must be in backplane mode

FIGURE B

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

15

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