X V M E - 1 0 0 M a n u a l
March, 1987
Signal
Mnemonic
Connector
and
Pin N u m b e r
Signal N a m e a n d D e s c r i p t i o n
I A C K *
1A:20
I N T E R R U P T A C K N O W L E D G E : Open- c o l l e c t o r o r t h r e e -
state d r i v e n s i g n a l f r o m a n y m a s t e r p r o c e s s i n g a n
i n t e r r u p t r e q u e s t . I t i s r o u t e d v i a t h e b a c k p l a n e t o
slot 1 , w h e r e i t i s l o o p e d - b a c k t o b e c o m e s l o t 1
I A C K I N * i n o r d e r t o s t a r t t h e i n t e r r u p t a c k n o w l e d g e
daisy-chain.
IRQ1*-
1B:24-30
I N T E R R U P T R E Q U E S T ( 1 - 7 ) : O p e n - c o l l e c t o r d r i v e n
IRQ7*
signals, g e n e r a t e d b y a n i n t e r r u p t e r , w h i c h c a r r y
p r i o r i t i z e d i n t e r r u p t r e q u e s t s . L e v c l s e v e n i s t h e
highest p r i o r i t y.
LW O R D *
1C:13
L O N G W O R D : T h r e e -state d r i v e n s i g n a l i n d i c a t e s t h a t
the c u r r e n t t r a n s f e r i s a 32- b i t t r a n s f e r.
( R E S E R V-
2B:3
R E S E R V E D : S i g n a l l i n e r e s e r v e d f o r f u t u r e V M E b u s
ED)
enhancements. T h i s l i n e m u s t n o t be used.
S E R C L K
1B:21
A r e s e r v e d s i g n a l w h i c h w i l l b e used a s t h e c l o c k f o r a
serial c o m m u n i c a t i o n b u s p r o t o c o l w h i c h i s s t i l l b e i n g
f i n a l i z e d .
S ER D AT
1B:22
A r e s e r v e d s i g n a l w h i c h w i l l b e u s e d a s t h e
transmission l i n e f o r s e r i a l c o m m u n i c a t i o n b u s
messages.
S Y S C L K
1A:10
S Y S T E M C L O C K : A c o n s t a n t 1 6 - M H z c l o c k s i g n a l t h a t
is i n d e p e n d e n t o f processor speed o r t i m i n g . I t i s used
f o r general system t i m i n g use.
Ta b l e A - 1 . V M E b u s Signal I d e n t i f i c a t i o n ( c o n t ' d )
A-4
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Summary of Contents for XVME-100
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