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B L O C K D I A G Ram Desc R I P T I O - HP 5363B Operating And Service Manual

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M o d e l 5363 B
Servi c e
+ 1
09.
- m
0 , -1
Cl
o
FF
1
° 1
1 1 1
-
+
F F
1 2 1
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F F
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° 1
F F
181 - + 1
° 1
x _v
1
2 5
4
2
4
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A
9
A
20
A
1 O
A
1 9
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1 8
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1 2
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1 7
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1 3
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8 -5 7 .
B L O C K D I A G R A M D E S C R I PT I O N
8-58.
The fo l l o w i n g t h ree pa ra g ra p h s c o n ta i n a g e n e ra l d e s c ri pti o n w h i c h ref e re n c e s t h e
b l o c k d i a g ra m i n
8 -5 9 .
T h e H P 5363 B a c c e pts s i g n a l i n p u ts t h ro u g h t h e A a n d B p r o b e s . An i n p u t s i g n a l i s
a p p l i e d t o o n e s i d e o f a d i ffe re n t i a l J F ET p a i r , w h i l e a p rese l e c ted d c refe re n c e v o l t a g e i s
a p p l i e d t o t h e o t h e r. I f t h e s i g n a l I n p u t c rosses t h e ref e re n c e l e ve l , t h e d i ffe re n t i a l J F ET s w i tc h
states a p p l y i n g e i t h e r a STA R T or STOP t ra n s i t i o n to t h e m o t h e rboa rd a sse m b l y. T h i s
t ra n s i t i o n i s ro uted t o t h e p r o b e s e l e c t c i rc u i t . w h e re c h a n n e l a n d s l o pe s e l e c t i o n s a re m a d e .
T h e s i g n a l I S t h e n d i rected t o a h i g h -s peed E C l c o m p a ra t o r n etwo rk , w h e re i t i s s h a ped , l e ve l
s h i f ted , a n d a p p l i e d t h ro u g h a 5 0 o h m d ri ve r t o a rea r p a n e l B N G . T h e STOP c h a n n e l c o n ta i n s
a n a d j u sta b l e d e l a y C i rc u i t a n d a f i xe d d e l a y l i n e t o c o m pe n sate f o r p r o b e a n d system t i m e
d e l a y d i ffe re n c e s .
8- 1 4
C o u n t e r c o n t r o l b l o c k used to s h o w c o m m o n i n p uts to a P re settab l e
Decade U p/ Do w n C o u nt e r . N o t i c e t h a t " + m " m e a n s c o u n t - u p
I
t h e c o u n t
b y u m " ; " - m " m ea n s c o u n t d ow n b y " m " . N ote: i f m = 1 , i t m a y b e
o m i tted . S i nc e t h e D-type f l i p -f l o ps a re m a ste r-s l a ve , t h e o u t p u t d e l a y
i nd i ca t o r i s used . T h e "=9", + 1 , a n d "=0, - 1 " notati o n d e f i n es w h e n t h e c a rry
a n d b o r ro w o u t p u ts a re g e n e ra te d . They a l s o d e f i n e it as a d e c a d e c o u n t e r ;
a b i n a ry c o u nte r w o u l d h a ve c a rry i n d i ca t e d w i t h " = 1 5 , + 1 " . F l i p -f l o p
we i g h t i n g i s i n d i cated i n p a re n t h e s i s .
Read O n l y M e mo r y w i t h 2 5 6 a d d re sses. Ad d ress s e l ec t i o n i s d e te rm i ne d b y
t h e e i g h t u p p e r i n p uts w h i c h a re d e c o d e d i nt o 2 5 6 p o ss i b l e a d d resses
I
i
c o r re s po n d i n g to t h e we i g h t i n g m o d i f i e rs a t t h e i n p uts. R O M s
AO-A255
a re i n i t i a l l y p rog ra m m e d w i t h a 1 6- b i t w o rd at eac h a d d ress. S t o r a g e
c a pac i ty f o r t h e R O M i s 2 5 6 1 6- b i t w o r d s 1 4096 b i ts
Fig ure 8 -3
I
i n c re me n t
I .

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