Tandy 1000 SL Technical Reference Manual page 102

FIGURE 5A. ARBITTER/REQUEST
0
c l o c k s m i n
I
<-
->
I
I
I I
t2->II<--
t 3 7
I I -
/-\ I
/-\
I /--\ I
1 - \
/
-
\
CPUCLK
\ - / \ / \
/ I
\
1
\ - /
( r e f )
I I 1 I
I I/-I-I
RQ/GTB (REQUEST
t o
CPU)
\ I
REQUEST
and
ACKNOWLEDGE
I
c a n o v e r l a p and be
s e e n
7 '
I
( o u t p u t )
I
I I
a s
o n e
p u l s e by t h e
- > I t 4
I < - I I I
c i r c u i t .
I <-
I /
RQ/GTB (ACKNOWLEDGE f r o m CPU)
/
( i n p u t )
- 1
t 6
->I
I < -
I /
H LDA
F I G U R E 5 B . ARBITTER/RELEASE
CPUCLK
( e x t e r n a l )
1 - \
/-\ / - \ /-\
\ - /
) -
/I
\ / \ -
I
RQ/GTB (RELEASE
( o u t p u t )
HLDA
A R B I T T E R PARAMETER
t 2
->i
I < -
i
->i
1 < - t 3
- 1
I
t o
CPU)
\ - I /
\ I I
I
/ -
I -
t 2
->i
I < -
i
->i
1 < - t 3
- 1
I
t o
CPU)
\ - I /
\ I I
I
/ -
I -
I < -
t 6
- > I
I
\ I
9