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Bin A R Y Select Option - Siemens 100-8D Technical Manual

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M o n i t o r s f l e x i b l e d i s k r o t a t i o n t o d e v e l o p a r e a d y s t a t u s f o r t h e
C o n t r o l l e r .
S e l e c t
W h e n S E L E C T i s i n a c t i v e ( h i g h ) , t h e s e l e c t l o g i c i n h i b i t s a l l i n t e r f a c e i n p u t
r e c e i v e r s a n d o u t p u t d r i v e r s t o a n d f r o m t h e d i s k d r i v e .
p r i m a r i l y c o m p r i s e d o f O R g a t e 4 A , N O R g a t e 5A , a n d i n v e r t e r 6B ( s e e F i g ­
u r e 3 - 9 ) .
J3
SELECT 0
26
SELECT 1
28
SELECT 2
30
SELECT 3
32
W h e n S E L E C T is i n a c t i v e , g a t e 4A o u t p u t s a h i g h t h r o u g h O P T D a n d is i n v e r t e d
b y 5A c a u s i n g a l o w S E L E C T s i g n a l to i n h i b i t a l l d i s k c h a n g e , r e a d y , i n d e x , s e c t o r ,
w r i t e - p r o t e c t , a n d t r a c k 00 l o g i c .
a l l h e a d l o a d , s t e p , d o o r i n t e r l o c k , a n d a c t i v i t y L E D l o g i c .
A s s h i p p e d f r o m t h e f a c t o r y , a j u m p e r p l u g i s i n s t a l l e d b e t w e e n t h e " 0 " R a d i a l
S e l e c t p a d s , c a u s i n g S E L E C T 0 to d r i v e 4A.
t h e d i s k d r i v e .
O n e o f t h r e e o t h e r a d d r e s s e s c a n b e a s s i g n e d , S E L E C T 1,
S E L E C T 2, o r S E L E C T 3 , b y r e m o v i n g t h e j u m p e r b e t w e e n t h e " 0 " p a d s a n d
i n s t a l l i n g it b e t w e e n t h e d e s i r e d R a d i a l S e l e c t p a d s .
n e c t e d t o t h e d i s k d r i v e .
c a n b e c o n n e c t e d i n d a i s v - c h a i n f a s h i o n
r R A D I A L SEL
I
I
OPTION
I ________
0
I SELECT
1
0 ^-4
r s

BIN A R Y SELECT OPTION

0-0
D -"
0
o - a 4
4-TO-IO
D-D 2
LINE
CH*
0 - D 6
DECODER
1
0 -D
CH-
7C
[ fn i
CHD 5
0 - D
3
CH
0 - D 7
F i g u r e 3 - 9 .
W i t h t h e R a d i a l S e l e c t f e a t u r e , up to f o u r d i s k d r i v e s
4A
n ~ -s n
S e l e c t L o g i c
I n v e r t e r 6
o u t p u t s a h i g h S E L E C T to i n h i b i t
b
T h i s a s s i g n s p h y s i c a l a d d r e s s 0 to
3 - 1 3
T h e s e l e c t l o g i c is
5A ^ ------- "
3 |6 B ^ O -----
SELECT
i p HD I
TO SELOPTOF
(
-c>
LSI C IR C U IT 6D
/ TO LHDLD OF
4
>
k
LSI C IR C U IT 6D
O n l y o n e j u m p e r c a n b e c o n ­
f
SELECT

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