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APPLICATIONS
17.1 Memory expansion
(2) Example of ROM expansion (maximum model)
Figure 17.1.25 shows a memory expansion example (maximum model) using a 1-Mbits ROM in the
microprocessor mode. Figure 17.1.26 shows the timing chart for this example.
Figure 17.1.27 shows a memory expansion example (maximum model) using a 1-Mbits ROM in the
microprocessor mode. Figure 17.1.28 shows the timing chart for this example.
M37751
CNV
SS
A
–A
1
7
BYTE
A
/D
–
8
8
A
/D
15
15
A
/D
16
0
ALE
D
–D
1
7
E
R/W
X
X
IN
OUT
25 MHz
Fig. 17.1.25 Example of ROM expansion (maximum model at low-speed running)
17–30
M5M27C102K-12
Address bus
A
–A
1
16
1
AC573
D
Q
A
–A
8
15
LE
AC573
A
16
D
Q
LE
Data bus
D
–D
0
15
2
AC04
Circuit condition : 3 access in low-speed running
7751 Group User's Manual
1: Use the elements of which propagation
delay time is within 15 ns.
2: Use the elements of which propagation
delay time is within 23 ns.
A
A
–
0
15
0000
0080
0880
D
D
–
0
15
OE
CE
1FFFF
Memory map
16
SFR area
16
Internal RAM
area
16
External ROM
area
(M5M27C102K)
16
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