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<When reading>
A
/D
8
A
/D
16
External memory
data output A
<When writing>
1Q (AC74)
2Q (AC74)
OC (F245)
WO, WE
A
/D
8
A
/D
16
External memory
data output B
Fig. 17.1.20 Timing chart for sample circuit using bus buffers (at high-speed running-2)
E
–A
/D
8
15
15
–A
/D
0
23
7
RD
OC (F245)
(F245)
1
1
E
–A
/D
8
15
15
–A
/D
0
23
7
(F245)
7751 Group User's Manual
125 (min.)
5 (max.)
A
AC32 (t
)
PHL
BC32 (t
)
PHL
F245
(t
/t
)
PZH
PZL
D
125 (min.)
BC32 (t
)
PHL
35 (max.)
A
D
F245
(t
/t
)
PHL
PLH
D
Write hold time
APPLICATIONS
17.1 Memory expansion
15 (min.)
A
AC32 (t
)
PLH
BC32 (t
)
PLH
F245
(t
/t
)
PHZ
PLZ
AC04 (t
)+AC74 (t
)
PLH
PLH
BC32 (t
)
PLH
AC32
2(t
)
PLH
F245
(t
/t
)
PHZ
PLZ
(Unit : ns)
17–25
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