Xycom XVME-682 Manual page 16

X V M E - 6 8 2 Manual
October , 1989
2 . 3 . 9 VMEbus M a s t e r Interface (J54)
T h e V M E b u s m a s t e r i n terface al l o ws t h e C P U chi p to b e c o m e a m a s t e r or i n terrupt handler
o n the V M E b u s . The m a s t e r i n terface i s i n voked w h e n e v e r t h e C P U chi p h a s accessed the
V M E b u s s t a n d a r d a d d r e s s s p a c e , t h e short I/O s p a c e , or the I A C K a d d r e s s s p a c e . VMEbus
c y c l e s m a y b e t e rmi n at e d wi t h B E R R or D T A C K . Jumper J 5 4 i s provi d ed to di s abl e the
B E R R N M I si g nal g e n e r a t i o n . W h e n t h e j u m p e r i s IN, t h e B E R R si g nal will g e n e r a t e a n NMI.
W h e n it i s out, t h e B E R R si g nal will not g e n e r a t e a n NMI . The defaul t i s IN.
2 . 3 . 1 0 E P R O M (J47, J48)
T w o j u m p e r s defi n e t h e t y pe of E P R O M at the o d d byte l o cati o n ( U 3 4 ) a n d the e v e n byte
l o cat i o n ( U 4 6 ) . They a r e J 4 7 a n d J 4 8 . T abl e 2 - 5 s h o w s h o w t h e s e t w o j u m p e r s a r e configured
t o sel e ct t h e t y pe of E P R O M o n t h e X V M E - 6 8 2 C P U m o d u l e . The defaul t i s J 4 7 A a n d J48B
( 2 5 6 K EPROMs).
T a b l e 2 - 5 E P R O M S e l e c t i o n Jumpers
JUMPER
J47 J48
B B
A B
A A
A A
2 . 3 . 1 1 V M E b u s " S l o t 1 " F u n c t i o n s (J5, J6, J9, J 1 5 , J34)
T h e X V M E - 6 8 2 c a n suppl y t h e V M E b u s f u nct i o ns a s s o c i a t e d wi t h Sl o t 1 (SYSRESET driver,
I A C K dai s y chai n dri v er, si n gl e -l e vel arbi t er, bus ti m eout, a n d S Y S C L K dri v er). These
f u nct i o ns are e n a b l e d a n d di s abl e d a s a g r o u p by j u m p e r s J5, J6, J9, J 1 5 & J34). T abl e 2-6
i l l u strates t h e conf i g urat i o ns of t h e s e j u m p e r s a n d thei r rel a t i o nshi p s to t h e Sl o t 1 functions.
T h e defaul t i s all IN, wi t h J 9 set to A.
T a b l e 2 - 6 Sl o t 1 Jumpers
JUMPER ENABLED DISABLED
J6
IN
J5 IN
J15 IN
J9 A
J34 IN
2-9
EPROM
TYPE
27512
27256
27128
2764
OUT
OUT
OUT
B
OUT
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