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COM20020 Datasheet(PDF) 14 Page - SMSC Corporation

Part # COM20020
Description  COM20020 3.3V ULANC Universal Local Area Network Controller with 2K x 8 On-Board RAM
PDF  72 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

COM20020 Datasheet(HTML) 14 Page - SMSC Corporation

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14
FIGURE 2 - MULTIPLEXED, 8051-LIKE BUS INTERFACE WITH RS-485 INTERFACE
RXIN
nPULSE
nPULSE
TXEN
GND
+3.3V
100
BACKPLANE
FIGURE
RXIN
nPULSE
FIGURE
Receive
HFD3212-
2
+5V
7
6
Transmitte
HFE4211-
+5V
3
2 Fiber
(ST
2
6
7
NOTE: COM20020 must be in backplane mode
AD0-
nINT1
RESET
nRD
nWR
A15
AD0-AD2, D3-
nCS
nRESET
nRD/nD
nWR/DI
nINTR
A2/BAL
ALE
XTAL1
XTAL2
GND
RXIN
nPULSE
nPULSE
nTXEN
8051
COM20020
Differential
Configuratio
Media
may be
with Figure A, B or
*
LTC1480 or
Equiv.
A0/nMU
27 pF
27 pF
XTAL2
XTAL1
20 MHz
XTAL
3.3V-5V Converter



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