COM20019 Datasheet, PDF (14/81 Pages) SMSC Corporation – Low Cost ARCNET (ANSI 878.1) Controller with 2K x 8 On-Board RAM

XTAL1
XTAL2
AD0-AD7
ALE
A15
RESET
nRD
nWR
nINT1
8051
COM20019
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 or B.
RXIN
TXEN
nPULSE1
nPULSE2
GND
+5V
100 Ohm
RXIN
nPULSE1
+5V
2
6 Receiver
HFD3212-002
7
+5V
Transmitter
3 ^HFE4211-014
2
6
7
2 Fiber Interface
(ST Connectors)
BACKPLANE CONFIGURATION
NOTE: COM20019 must be in backplane mode
FIGURE 2 - MUL^FIT^GIP^UL^RE^EX^AED, 8051-LIKE BUS INTERFACE W^FIT^IGH^UR^RS^E-^B485 INTERFACE
14
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