Renesas 7700 FAMILY User Manual page 400

M37751
CNV
SS
A
1
BYTE
A /D
8
A /D
15
ALE
A
16
D –D
1
R/W
BHE
X X
IN OUT
Circuit condition : 4 access in high-speed running
1: Use the elements of which propagation delay time is within 50 ns.
2: Use the elements of which propagation delay time is within 30 ns.
3: Use the elements of which propagation delay time is within 7.2 ns.
4: Use the elements of which propagation delay time is within 22.2 ns.
Fig. 17.1.31 Example of ROM and SRAM expansion (maximum model at high-speed running)
Address bus
–A
7
–
A8 A15
2
AC573
–
8
D Q
15
LE
–
A1 A15
2
AC573
A16
D Q
/D
0
–
D8 D15
LE
Data bus (odd)
Data bus (even)
7
AC04
BC32
E
A
0
4
AC32
31 MHz
7751 Group User's Manual
M5M27C256AK-12
CE
CE
A –A
0 14 A –A
0 14
–
A1 A15
–
D0 D7
D –D
0 7 D –D
0 7
OE OE
3
RD
WE
WO
APPLICATIONS
17.1 Memory expansion
M5M5256CP-70LL
1
S
AC04
A –A A
0 14 0
– –
A1 A15 A1 A15
– –
D8 D15 D0 D7
DQ –DQ
1 8 DQ
OE W
Memory map
0000
16 SFR area
0080
16
Internal
RAM area
0880
16
External
ROM area
(M5M27C256AK 2)
10000
16
External
RAM area
(M5M5256CP 2)
1FFFF
16
S
–A
14
–DQ
1 8
OE W
17–35