3 . M P U
BOARD
C i r cu i t Descr i p t i on ( cont ' d )
U 1 0 1
p i n
1 8 ( p i n 1 9 ) sends
a
ver I f l ed
I ACK4
( I ACK5 ) s i gna I
to
U 2 3 ( U 2 2 ) p i n 37 .
U 2 3 ( U 2 2 ) sends
I t s use r vector number by t h e
d a t a
bus
I I nes
( DO-D 7 )
t o
t h e
m i c r o p r ocessor .
U23
( U 2 2 )
p i n
( DTACKB )
s i g na l
d a t a t r a n s f e r I s
9 sends DTACK t o
9
sends
QTACKA
to U35 p i n 7 when
comp l e t e .
U 3 5 p i n
U 1 p i n 1 0 .
The
DUARTs
h a ve
a s y n c h ronous
p r o t oco l s and so f t w a r e se l e c t a b l e
BAUD
r a t e s f r om 0 t o 1 9200 BAUD .
The 4
ser
I
a I I /O por t s a r e R S 2 3 2
comp a t i b l e and a r e a v a i l a b l e o n t h e
backp l ane a s fo l l ows .
Por t
P l ug
3 DCE
J 25
s p a r e
J 36
b I I I acce p t o r
( See
J UM P E R S E L ECT
TAB L E
I n t h i s
Sec t I on . )
DCE
J 24 s p a r e
2
DTE
J 2 3
H H U
0
DTE
J 2 2
SDS
The por t s are con f i gu r e d a s d a t a
commun i ca t i on equ i pme n t
( DCE )
o r
d a t a t e rm i n a l equ i pmen t ( DTE ) .
3-54
NOT E S
Summary of Contents for 5000 Plus
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