5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
XTAL1
XTAL2
COM2002
D0-D7
A0
D0-D7
A0/nMUX
RXIN
A1
A1
A2/BALE
LTC1480 or
Equiv.
A2
TXEN
nPULSE1
nPULSE2
A7
nCS
nRES
nIOS
R/nW
nIRQ1
nRESET
nRD/nDS
GND
nWR/nDIR
nINTR
Differential Driver
Configuration
6801
* Media Interface
may be replaced
XTAL1
with Figure A, B or C.
XTAL2
27 pF
27 pF
20MHz
XTAL
+5V
HYC9068 or
HYC9088
+
10
uF
0.47
uF
3.3V-5V Converter
RXIN
RXIN
6
12
11
N/C
nTXEN
0.01 uF
1KV
5.6K
1/2W
nPULSE1
nPULSE2
GND
nPULSE1
5.6K
1/2W
nPULSE2
17, 19,
4, 13, 14
3
Traditional Hybrid
Configuration
0.47
uF
-5V
+
10
uF
*Valid for 2.5 Mbps only.
FIGURE C
FIGURE 3 - NON-MULTIPLEXED, 6801-LIKE BUS INTERFACE WITH RS-485 INTERFACE
SMSC COM20020I 3.3V
Page 17
Revision 12-06-06
DATASHEET
SMSC [ SMSC CORPORATION ]
