COM20020I Datasheet, PDF (18/72 Pages) SMSC Corporation – 5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM

5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
Datasheet
XTAL1
XTAL2
AD0-
ALE
A15
RESET
nRD
nWR
nINT1
8051
COM20020ID
AD0-AD2, D3-
A2/BAL
nCS
nRESET
nRD/nD
nWR/DI
nINTR
RXIN
nTXEN
nPULSE
nPULSE
GND
75176B or
Equiv.
Differential
Configuratio
A0/nMU ^XTAL1 XTAL2
27 pF
20 MHz
XTAL
27 pF
*Media
may be
with Figure A, B or
RXIN
+5V
100
TXEN
nPULSE
nPULSE
GND
BACKPLANE
FIGURE A
RXIN
+5V
2
6 Receive
HFD3212-
7
nPULSE
Transmitte
3 ^HFE4211-
+5V
2
6
7
2 Fiber
(ST
NOTE: COM20020 must be in backplane mode
FIGURE B
Figure 5.1 – Multiplexed, 8051-Like Bus Interface with RS-485 Interface
Revision 12-05-06
Page 18
DATASHEET
SMSC COM20020I Rev D