Table of Contents
Advertisement
M o d e l 5 3 6 3 6
S e r v i c e
•
•
•
8 - 6 6
AS H P - I B I N T E R FA C E ASSE M B LY
H P - I B
The
I n te rface Asse m b l y c o n t a i n s an a l g o r i t h m i c state m a c h i n e s i m i l a r t o t h e A 1
m o t h e rb o a rd . T h e state m a c h i n e c o n S i sts of R O M U l , a n d state c o u nters U 1 5 a n d U 8 U 1 3 ,
U 7 , a n d U 1 2 a r e I n p u t q u a l i f i e r d e c o d e r s , U3 a n d U 4 a re o u t p u t data l a t c h e s , a n d U l O i s a
c o m m a n d d e c o d e r . T h e i n te rface a d d ress c o m p a ra t o r IS U 2 0 , a n d the a d d ress s w i t c h is S 1
U 1 9
a 4 - x 1 6- b l t R A M w h i c h stores b us d a t a , represe n t i n g t h e f r o n t p a n e l t h u m b w h e e l
I S
s W i t c h e s , i n t h e s a m e a d d ress l o c a t I O n s a s t h e f r o n t p a n e l . The A1 M o t h e r b o a rd s t a t e m a c h i n e
w i l l a d d ress a n d s a m pl e t h e d a t a f r o m e i t h e r t h e f ro n t p a n e l t h u m b w h e e l S W i t c h e s o r R A M
U 1 9 , T h ro u g h U l l , d e p e n d i n g on t h e s t a t u s of R E M O T E T h e d a t a
A 1 m a i n state mac h i n e i n l o c a l o p e r a t i o n b y o p e n c o l l e c t o r d r i ve rs i n U 1 8
U 1 7
the R e m o t e Ca l i b ra t i o n F-F, a n d U 1 6 i s t h e E R R O R F L A G F - F . U 1 8 i s t h e c l o c k , w h i c h
I S
c a n b e h a l t e d a n d s i n g l e stepped I n t h e s a m e m a n n e r a s t h e m o t h e rboa rd c l o c k
U 1 9
i s o lated f ro m t h e
I n
I S
•
•
Advertisement
Table of Contents
