SMSC COM20020 User Manual download pdf (Page 13)

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AD0-AD7

nINT1

RESET

nRD

nWR

A15

AD0-AD2, D3-D7

nCS

nRESET IN

nRD/nDS

nWR/DIR

nINTR

A2/BALE

ALE

A0/nMUX

XTAL1

XTAL2

GND

RXIN

nPULSE1

nPULSE2

nTXEN

27 pF

8051

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

RXIN

nPULSE1

nPULSE2

TXEN

GND

+5V

100 Ohm

BACKPLANE CONFIGURATION

FIGURE A

COM20020

Differential Driver

Configuration

Media Interface

may be replaced

with Figure A, B or C.

RXIN

nPULSE1

FIGURE B

Receiver

HFD3212-002

+5V

Transmitter

HFE4211-014

+5V

2 Fiber Interface

(ST Connectors)

NOTE: COM20020 must be in backplane mode

75176B or

Equiv.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 59 60

COM20020 1
COM20020 ULANC 1
TABLE OF CONTENTS 2
PIN CONFIGURATION 3
DESCRIPTION OF PIN FUNCTIONS 4
FIGURE 1 - COM20020 OPERATION 7
PROTOCOL DESCRIPTION 8
SYSTEM DESCRIPTION 12
FIGURE A 13
FIGURE B 13
FIGURE C 14
FUNCTIONAL DESCRIPTION 19
DATA COMMAND DESCRIPTION 27
Table 6 - Command Register 27
Table 10 - Setup Register 30
TRI RI TA POR TEST RECON 37
OPERATIONAL DESCRIPTION 43
TIMING DIAGRAMS 46
COM20020 ERRATA SHEET 59

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SMSC COM20020 User Manual Page 13

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