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sec
IEI
=
"H" and VECT CIACK)
=
"L" so the vector is output.
At t his point the #2 IEO is
"L"
Flowcharts showing the process when INT is output by #1-SCC
and when it is output by #2-SCC are given below.
a) Internal SCC interrupt acknowledge cycle
sec
#
1 outputs
interrupt
<CPU>
< CDECR >
IPLO to
2
output
J . . . .
• 1 1 - - - - - - - - - - - - - - i
]
•
IACK cycle opened ]
R/W output, FCO to 2 output/
A 1 to A3
=
"1 01 "
AS= "L"
-
-
- -
•
r
Vector read
r
AS= "H"
in ]
l
]
<MEMC>
- - - - - - -
-{
IACK output
]
1
_..
<PARK>
VECT output
IOBSEL output
IORD output
-
I EOSLOT = "L"
1
RD RES
IACK received/
~----~--~
INT negated/
Vector output
DSACKIO output
J
1
IACK negated ]
.____~
1
__ __.
VECT, IOBSEL,
~----___,__..._,
IORD and
,
r
End of cycle
l
NWS-1510/1530/1580
DSACKIO negated
l
3-27
-
Vector output
completed
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