COM20020_00 Datasheet, PDF (15/82 Pages) SMSC Corporation – Universal Local Area Network Controller with 2K x 8 On-Board RAM

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
15
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