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X V M E - 6 8 2 Manual
October , 1989
T a b l e A-1 JI - V M E b u s S i g n a l Identification cont.
Connector
Signal
and
Mnemonic
P i n Number
S i g n a l N a m e a n d Description
DOO-D15
1A:1-8
D A T A B U S (bi t s 0 - 1 5 ) : T h r e e - s t a t e dri v en, bi - di r ecti o nal d a t a lines
IC:1-8
t h at provi d e a d a t a pat h b e t w e e n t h e D T B m a s t e r a n d slave.
GND
IA:9,11,
GROUND
15,17,19,
I B:20,23,
1C:9
2B:2,12,
22,31
IACK*
1A:20
I N T E R R U P T A C K N O W L E D G E : O p e n -col l e ctor or three-state
dri v en si g nal from a n y m a s t e r p r o c e s s i n g a n i n terrupt request.
It i s rout e d vi a t h e b a c k p l a n e to sl o t 1, w h e r e it i s l o o p e d -back to
b e c o m e sl o t I I A CKI N * i n order t o start t h e i n terrupt acknowledge
d a i s y -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 -col l e ctor dri v en signals,
IRQ7*
g e n e r a t e d by an i n terrupter , whi c h carry pri o ri t i z ed interrupt
r e q u e s t s . Level s e v e n i s t h e hi g hest priority.
LWORD*
IC:13
L O N G W O R D : T h r e e -st a t e dri v en si g nal i n di c at e s that t h e current
t r ansf e r i s a 3 2 -bi t transfer.
(RESERVED) 2B:3
R E S E R V E D : Si g nal line reserved for future VMEbus
e n h a n c e m e n t s . Thi s l i n e m u s t not b e used.
SERCLK 1B:21
A r e s e r v e d si g nal whi c h will be u s e d as the cl o ck for a serial
c o m m u n i c a t i o n b u s prot o col whi c h i s still bei n g finalized.
SERDAT 1B:22
A r e s e r v e d si g nal w h i c h will b e u s e d a s t h e transmi s si o n l i n e for
seri a l c o m m u n i c a t i o n b u s messages.
SYSCLK 1A:10
S Y S T E M C L O C K : A constant 16- M H z cl o ck si g nal that is
i n d e p e n d e n t of p r o c e s s o r s p e e d or ti m i n g. It i s u s e d for general
s y s t e m ti m i n g use.
A-3
A r t i s a n T e c h n o l o g y G r o u p - Q u a l i t y I n s t r u m e n t a t i o n .. G u a r a n t e e d 1 ( 8 8 8 ) 8 8
I www.artisantg.com
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