COM20020I Datasheet, PDF (71/72 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
Appendix B - Example of Interface Circuit Diagram to
ISA Bus
ISA Bus
AEN
SA15-SA4
SD7-SD0
LS688x2
nG
12 bit
Comparators
P
Q
I/O Address Seeting (DIP Switches)
12
P=Q
12
LS245
A
16 bit Bus
Transceivers
A
B
8
8
DIR
nG
COM20020
nCS
D7-D0
nIOR
nIOW
SA2-SA0
3
IRQm
nIOCS16
DRQn
nDACK
TC
nREFRESH
RESETDRV
3
Schmitt-Trigger Buffer
nRD
nWR
A2-A0
nINTR
nRESET
SMSC COM20020I Rev D
Page 71
DATASHEET
Revision 12-05-06