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M od e l 5363 8
S e rv i c e
8 - 1 0 3 .
The q u a l i f i e r s e l ec t o r s U 2 1 and U 1 5 select a q u a l i f i e r l i n e to e xa m i n e . R O M o u t p u t s
0 8
0 1 3
a n d
d e te rm i n e w h i c h q u a l i f i e r i s e n a b led a n d o u t p u t s
s pe c i f i c i n p u t l i n e . T h e stat u s of t h a t l i n e i s t h e n f e d t h r o u g h e xc l u s i ve - O R U 2 2 D a n d a p p l i e d
a s i n p u t d ata t o q u a l i f i e r f l i p-fl o p U 2 3 A . P r o vi d i n g U 23A h a s n o t b e e n p r e set b y t h e c o m m a n d
e n a b l e l i n e , t h e n e xt c l o c k p u l s e w i l l s t o re t h e q u a l i f i e r b i t , a l l o w i n g t h e q u a l i f i e r d e c o d e r
i n p u t s a n d ad d resses t o c h a n g e .
8- 1 04 .
U 22 A i s a n e xc l u s i ve - O R g a te w h i c h i s u se d a s a p r o g ra m m a b l e i n ve rt e r . P i n 3 i s t h e
l O A D i n p u t to t h e state c o u n t e rs , w h i c h d i rects t h e c o u n te rs to i n c re m e n t o n e a d d ress o r
p a ra l l e l l o a d a j u m p a d d re ss. T h e status of p i n 1 wi l l d e te rm i n e i f t h e q u a l i f i e r b i t at p i n 2 i s
i n ve rted o r n o t i n ve rted at p i n 3 . T h i s a l l o ws t h e use o f b o t h h i g h q u a l i f i e rs a n d l o w q u a l i f i e rs to
pe rfo r m a j u m p .
8-1 05.
State M a c h i n e Functions
8-1 0 6 .
Ove ra l l , t h e state m a c h i n e c a n p e rf o r m four basic o p e ra t i o n s . T h e stat u s of R O M
0 1 4
o u t p u ts
a n d
1 .
Exec u te Com m a n d a n d C o u n t
2 .
Exec ute C o m m a n d a n d J u m p ' G O TO
3 .
E xa m i n e Q u a l i f i e r/J u m p i f H i g h
E xa m i n e Q u a l i f i e r/J u m p i f low , 0 ,
4 .
8-1 0 7 .
T h e fol l o w i n g pa rag ra p hs d e sc ri b e h o w t h e state m a c h i ne p e rf o r m s t h e se f u n c t i o n s :
a .
Exec ute C o m m a n d a n d C o u n t
b .
Exec ute C o m m a n d to G O T O
c .
E xa m i n e q u a l i f i e r/J u m p i f Q=1
8-1 0 8 .
Exa m i n e q u a l i f i e r/j u m p i f Q=O i s s i m i l a r to e xa m p l e c a b ove and t h e re f o re i s n ot
n ec e ssa ry to i n c l u d e . P o rt i o n s of t h e f l o w c h a rt i n
f u n c t i o n s .
8-1 0 9 .
E X E C U T E C O M M A N D A N D C O U N T . An e xa m p l e o f e xec ute c o m m a n d a n d c o u n t
Fig ure 8 - 5 .
c a n b e s e e n i n
t h e c o m ma n d a n d c o u n t m o d e . O u t p u t s
0 1 1 0 6 d e c i m a l t o c o m m a n d d e c o d e r U 1 1 . T h e 0 o n U 1 1 p i n 1 8 e n a b l e s t h e d e c od e r, a l l o w i n g
t h e n e xt c l o c k p u l se o n p i n 1 9 t o b e ro u ted t o t h e selected c o m m a n d l i n e , w h i c h i s o u t p u t 6 o r
C l K l ATC H .
8-1 1 0 .
W i t h R O M
w i t h a l o w f r o m R O M
i n p u ts to U 2 5 and U28, thus t h e state c o u n te rs w i l l i n c re m e n t one c o u n t o n t h e n e xt c l oc k
p u l se . T h i s read d resses t h e R O M f ro m 2 4 7 oct 367 t o 248 oct 370 T h e f l o wc h a rt i n
5 .
s h ows a se r i e s o f c o m m a n d a n d c o u n t state s.
8-24
0 1 5
d e te r m i n e t h e o p e rat i o n m o d e a s f o l l o w s :
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1
I
A t a d d ress 247 · o c t 367 , R O M o u t p uts
0 1 0
0 1 5 1 0 w ,
U 2 3 A i s preset s o t h a t p i n 5 i s h i g h . T h i s h i g h t o U 22 A p i n 2 , a l o n g
0 1 4
p i n 1 . d ri ve s U 2 2 A o u t p u t p i n 3 h i g h . T h e h i g h d i sa b l e s t h e lOAD
0 1 0 , 0 1 1 ,
R O M
0 1 5
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Fig ure 8 - 1 0
wi l l be used to i l l ust rate t h ese
0 1 5
a n d
0 1 3
t h ro u g h
a p p l y a b i n a ry a d d re ss s e l ec t i o n o f
0 1 2
a n d
a d d ress t h e
A 1 U 3 0
R O M
A5 U 1
0 1 4
0 1 4
0 1 5
0
1
0
1
0
1
1
0
0
0
0 1 4
a re b o t h 0 setti n g
Fig ure 8 -
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