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APPLICATIONS
17.1 Memory expansion
M37751
A
–A
1
7
CNV
SS
BYTE
ALE
A
/D
–
8
8
A
/D
15
15
A
/D
–
16
0
A
/D
23
7
R/W
BHE
A
X
X
IN
OUT
40 MHz
1: Use the elements of which propagation delay time is within 45 ns.
2, 3 : Use the elements of which sum of output disable time in 2 and
propagation delay time in 3 is within 15 ns, and the sum of output
enable time in 2 and propagation delay time in 3 is 5 ns or more.
4: Use the elements of which propagation delay time is within 40 ns.
Fig. 17.1.17 Example for using bus buffer (at high-speed running-1)
17–22
AC573
D Q
LE
AC573
D Q
LE
A
DIR
A
DIR
E
1
AC04
0
4
AC32
7751 Group User's Manual
Address bus
OE
OE
2
F245
B
OC
2
F245
B
OC
3
BC32
RD
WO
WE
Circuit condition: 5 access in high-speed running
Data bus (odd)
Data bus (even)
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