Table of Contents
Advertisement
3-3-10-2. SPECIAL
access
SPECIAL access is used by the CPU to access an optional sound
board installed in CN601 on the MB-5 board.
The DSACK signal
is generated automatically by WSC-PARK.
<CPU>
SPECIAL address output/
R/W
=
output/
FCO - 2
output
AS= "L"
<MEMC>
PORT output
< CDECR >
~-____,-
IOSEL output
<PARK>
' - - - - - - - 1 -
SPECIAL output
CN101 -----.
IOBD buffer enablede
MB-5: CN601
Access opened
DSACKIO output
AS= "H"
,____ _ ___,_ PORT negated
~-----1-
IOSEL negated
SPECIAL DSACKIO
~-----I-
negated
l-
4
~------------------------~•1
End of ccess
End of cycle
3-3-10-3. VECT
access
VECT access is used by the CPU fetch an interrupt vector in
response to an interrupt issued by sec CLH8530A) on the
NWB-231A board installed in an expansion
I/0
slot.
The
NWS-1510/1530/1580
3-25
Advertisement
Table of Contents
