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APPLICATIONS
17.1 Memory expansion
M37751
A
–A
8
(D
–D
0
A
0
RDY
1
1
E
CS
2
Q(AC74)
RDY
t
Sum of propagation delay time for AC32 , AC74,
and AC04(max. : 26 ns)
Fig. 17.1.8 Example of using Ready function (at 2 φ access in low–speed running)
17–12
23
1
)
15
Address
Address latch
decode
circuit
circuit
–A
7
AC74
E
D
Q
T
1
1
AC04
Circuit condition: f(X
A
B
t
c
t
d
(E-
)
1
su
(RDY-
)
1
7751 Group User's Manual
Data bus
2
CS
1
CS
2
Address bus
3
AC32
Ready function is available
only for areas accessed
by CS
.
2
) ≤ 25 MHz, 2 access in low-speed running
IN
Ready request is accepted at the RDY pin input
level judgment timing A .
Ready state release request is accepted at the
RDY pin input level judgment timing B .
t
su
(RDY-
)
1
1, 2
Use the elements of which propagation delay
time is within 12 ns.
: E ( "L" level) stop by Ready function.
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