C i r cu i t Des c r i p t i on
The ma j o r c i r cu i t d e s c r i p t i ons and
d i ag r ams
fo l l ow
t h e
2
p r ocesses
t h a t some c i r cu i t s h a v e I n common .
T h e
Ch i p Se l e c t d e s c r i be s
t he
m i c r o p r ocessor enab l i ng a spe c i f i c
c h i p
for
commun i ca t i on ,
T h e
I n t e r r u p t Cyc l e e x p l a i n s how a c h i p
( dev i ce )
i n t e r r up t s
t h e
68000
m i c r o p r ocessor a c t i on .
Ch i p Se l ec t
When t he p r o p e r a d d r e ss I s p r ese n t ,
a
s i gna l i s s e n t wh i c h r e su l t s
I n
commun i c a t i on
be tween t he
c h i p
( de v i ce ) and t he
m i c r op r ocessor .
The c h i p se l e c t fo l l ows
t hese 3
s t ep s .
1 .
T h e c h i p se l ec t for
a l I
c h i p s
beg i n w i t h so f t wa r e add r es s i ng
t he memo r y decode r ( U 1 0 ) w i t h i n
a p a r t i cu l a r a d d r e s s r a nge .
T h e
c h i p se l e c t
f r om h e r e d i f f e r S
for 68000 c h i ps a n d 6800 c h i p s .
68000 c h i p s
U 1 0 decodes
t he
a d d r e s s
and
sends a
I oca I I /O s I �na I
f r om
p i n 1 9 t o t h e
a d d r e s s decode r
( U7
p i n 1 8 ) .
U7 decodes wh i c h
c h i p se l e c t s i gna l t o send a n d
t he c h i p i s se l ec t e d .
wa t c h dog
U7 p i n
7 sends WOR ST
to
t he
wa t c h dog c i r cu i t ( U 38 p i n 1 1 &
U47 p i n 1 1 ) .
D UART
U7 p i n 1 sends DUARTCS 1 t o t he
DUART ( U 2 2 p i n 35 ) .
U7
p i n 2 sends DUARTCS2 t o t he
DUART ( U 2 3 p i n 35 ) .
3 . t.4PU BOARD
NOT E S
3- 1 7
Summary of Contents for 5000 Plus
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