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8 -9 1 .
T H E H P - I B I N T E R FA C E AS S E M B LY
8-9 2 .
T h e H e w l ett- Pac k a rd I n te rface 6 u s H P- 1 6 a l l o ws t h e f u n c t i o n s of t h e 5363 6 to b e
co n t r o l l ed re m o t e l y . I n rem ote o p e rat i o n . i t rec e i ves a n d s t o r e s b u s d a t a . w h i c h i s a rra n g e d
a n d o u t p u t to t h e m o t h e rboa rd i n a f o r m a t w h i c h s i m u l a tes t h e fro n t p a n e l s w i t c h es. A l l
c o n t ro l f u n c t i o n s a n d l e v e l sett i n g s . e xc e p t d e l a y ad j u st . a re p r o g ra m m a b l e v i a t h e H P- 1 6 .
8-93.
P OW E R S U P P LY
8-94.
The a l te r n a t i n g c u r r e n t l i n e s u p p l y
vo l ta g e s req u i re d b y t h e 5363 6 .
8 -9 5 .
STATE M AC H I N E D E S C R I PT I O N
8-96 .
T h e 5363 6 c o n ta i n s two state m a c h i n e s . o n e state ma c h i n e i s l oca ted o n t h e A 1 M a i n
M o t h e rb o a rd Asse m b l y a n d a n ot h e r o n t h e A 5 H P- I 6 I n t e rface Asse m b l y. T h e two c i rc u i t s a re
ve ry s i m i l a r i n a p pea ra n ce a n d o p e ra t i o n . R ef e re n ce s i n t h i s s e c t i o n wi l l be d i rected to t h e
state m ac h i n e o n t h e A 1 M a i n M o t h e rboa rd ·
b o t h .
8-9 7 .
State M a c h i n e C i rc uits
8-9 8 .
T h e state m a c h i n e c o n s i sts of c l o c k U 1 4 A and U 1 4 6 . state c o u n t e rs U 2 5 and U 2 8 , RO M
U 3 0 , prog ra m m a b l e i n ve rte r U 2 2 A , q u a l i f i e r s e l e c t o r s U 1 5 a n d U 2 1 , q u a l i f i e r f l i p -f l o p U 2 3 ,
c o m m a n d d e c od e r U 1 1 . a n d c o m m a n d l a t c h U 2 6 .
8-9 9 .
U 1 4 c o n t a i n s t w o s e p a rate c l o c k c i rc u i ts . U 1 4 6 i s t h e ma i n C L O C K w h i c h d ri ves t h e
va ri o u s l a t c h e s . d e c o d e rs , a n d s e l e c t o r s a s we l l a s t h e R O M s state c o u n t e rs . U 1 4 A i s t h e
T I M E R c i rc u i t . A l o w o n U 1 4 p i n 6 p r o d u c e s a o n e - s h o t l o g i c h i g h t i m i n g c y c l e w h i c h i s f e d a s a
q u a l i f i e r i n p u t to q u a l i f i e r s e l ec t o r U 2 1 .
8- 1 00 .
T h e state c o u n t e rs U 2 5 a n d U 28 a re a rra n g e d to c o u n t f r o m 0 to 2 5 5 u s i n g U 2 5 to
co u n t t h e l o we r order b i ts a n d U 2 8 for t h e h i g h e r o rd e r b it s . T h e LOAD i n p u ts p i n 9 ·
dete rm i ne w h e t h e r t h e c o u n t e rs i n c re m e n t t h e i r c o u n t b y 1 o r a c c e p t pa ra l l e l i n p u ts 0 0
th ro u g h 0 7 T h e l atte r i s u sed to p e rf o r m J u m p ro u t i n e s. D u ri n g t h e c o u n t m o d e , afte r U 2 5
re c e i ves 1 0 c o u n t s . ca rry o u t p i n 1 5 g oes m o m e n ta ri l y h i g h a l l o w i n g a c l o c k a n d c o u n t i n
U 28 . Fo r j u m p r o u t i n es L O A D p i n 9 g oes l o w , a n d t h e n e xt c l o c k p u l se ca u s e s t h e 00 t h ro u g h
0 7 pa ra l l e l i n p u ts t o t ra n sfe r a c ross t o t h e i r o u t p u t s . T h e o u t p u t s o f t h e state c o u n te rs
d e te r m i n e t h e a d d ress f o r R O M U 3 0 .
T h e R O M is p e r m a n e n t l y p rog ra m m ed w i t h a 1 6- b i t w o rd at e a c h of 256 a d d re sses.
8-1 0 1 .
8-1 02
U 30 0 1 5 p i n 1 3 i s the e n a b l e l i n e for c o m m a n d d e c o d e r U 1 1 When the R O M o u t p u t
i s t o be u sed a s a c o m m a n d . U 30 p i n 1 3 wi l l b e l o w e n a b l i n g U 1 1 . C o m m a n d d e c o d e r U 1 1
accepts t h e ad d ress g e n e rated b y R O M o u t p uts 0 1 0 t h ro u g h 0 1 3 a n d d i rects t h e n e xt i n ve rted
clock p u l se to t h e c o r re s po n d i n g o u t p u t . p r ov i d i n g a m o m e n t a ry low c o m m a n d p u l s e . The l o w
I S
e n a b l e f o r U 1 1
a l so a p p l i e d a s a p reset f o r q u a l i f i e r f l i p -f l o p U 23 A . sett i n g t h e o u t p u t p i n 5
h i g h .
IS
c o n v e rted to t h e s i x f i xe d a n d reg u l ated d c
. b ut t h e ove ra l l t h eo ry a p p l i e s t o
Fig u re 8 - 1 1
M od e l 5 3 6 3 6
S e r v i c e
8-23
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