Xycom XVME-682 Manual page 8

X V M E - 6 8 2 Manual
October , 1989
1 . 3 XVME-682 T W O - C A R D ARCHITECTURE
1 . 3 . 1 The X V M E - 6 8 2 C P U Module
T h e X V M E - 6 8 2 C P U M o d u l e u s e s a n 8 0 2 8 6 m i c r o p r o c e s s o r wi t h sof t w are- s e l e c t e d speeds of
1 0 , 8 or 6 M H z . M e m o r y i s avai l a bl e a s ei t her 1 M b y t e or 4 M b y t e dual - port e d R A M (wi t h one
wai t st a t e ). Both t h e V M E b u s a n d P C / A T i n t e rf a ces r e s i d e o n thi s b o a r d . Other XVME-682
C P U f e at u res include:
• An opt i o nal 8 0 2 8 7 m a t h c o -processor
• Full I B M A T mot h erboard features
• V M E b u s m a s t e r , s l a v e a n d i n terrupt h a n d l e r interfaces
• A "Real M o d e W i n d o w " w h i c h al l o ws al l V M E b u s l o cat i o ns to b e a c c e s s e d whi l e the
p r o c e s s o r i s i n "real mode"
• Control / Status registers
• W a t c h D o g Timer
• V M E b u s "Sl o t 1" functions
• Three sof t w are-conf i g urabl e p o r t s (2 seri a l a n d 1 parallel)
• IBM P C / A T b u s accessi b i l i t y vi a V M E b u s P 2 c o n n e c t o r or opti o nal l o cal connector
1 . 3 . 2 The X V M E - 6 8 2 I/O Module
T h e X V M E - 6 8 2 I/O C a r d p r o v i d e s t h e i n terface b e t w e e n t h e X V M E - 6 8 2 C P U card a n d the
f l o ppy di s k, hard di s k a n d graphi c s control l e r . Feat u res on the X V M E - 6 8 2 I/O Module
include:
• EGA, C G A , M D A , a n d H e r c u l e s g r a p h i c s support
• 256K of vi d eo RAM
• IBM P C / A T - c o m p a t i b l e W i n c h e s t e r a n d fl o ppy d i s k controller
• Control of u p to t w o W i n c h e s t e r -t y pe hard di s k drives
• Control of u p to t w o fl o ppy d i s k drives
1 . 3 . 3 XVME-682 B u s S i g n a l Interfaces
T h e X V M E - 6 8 2 C P U a n d I/O b o a r d s are uni t e d vi a a l o cal b u s . Thi s al l o ws t h e C P U board
t o c o m m u n i c a t e di r ectl y wi t h t h e g r a p h i c s or di s k-control l e r ci r cui t ry wi t hout tyi n g u p the
V M E b u s . V M E b u s si g nal s a r e carri e d by t h e P 1 connector.
T h e X V M E - 6 8 2 I/O m o d u l e requi r es the P C / X T b u s for proper operat i o n of its graphics
control l e r ci r cui t ry . It a l s o requi r es t h e full P C / A T b u s for operat i o n of the di s k-controller
circuitry.
T h e P C / X T b u s i s p l a c e d on R o w s A & C of the V M E b u s P 2 b a c k p l a n e connector o n all
v e r s i o n s of the X V M E - 6 8 2 . The r e m a i n d e r of the si g nal s requi r ed for the PC/ A T b u s are
p l a c e d ei t her o n the R o w B of t h e V M E b u s P 2 b a c k p l a n e c o n n e c t o r , or o n a l o cal connector
(P3).
T h e X V M E - 6 8 2 / 1 a n d X V M E - 6 8 2 / 3 a r e d e s i g n e d to al l o w u s e of a 3 2 -bi t p r o c e s s o r i n t h e same
b a c k p l a n e a s t h e X V M E - 6 8 2 . The t a bl e s i n A p p e n d i x C d e s c r i b e t h e si g nal s a s s i g n e d f o r the
v a r i o u s opt i o ns of t h e XVME-682.
1-3
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