COM20020D Datasheet, PDF (71/72 Pages) SMSC Corporation – ULANC Revision D Universal Local Area Network Controller with 2K x 8 On-Board RAM

APPENDIX B: EXAMPLE OF INTERFACE CIRCUIT DIAGRAM TO ISA BUS
ISA Bus
LS688x2
AEN
nG
12 bit
Comparators
SA15-SA4
SD7-SD0
P
Q
I/O Address Seeting (DIP Switches)
P=Q
12
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
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