
APPLICATIONS
7735 Group User’s Manual
17–6
Figure 17.1.2 shows the relationship between ta(AD), tsu(D) and the system clock frequency. For ta(AD) in
Figure 17.1.2, an address decode time and an address latch delay time are not considered. The actual
ta(AD) is a value obtained by subtracting the above times from the value shown in Fig.17.1.2.
Data
setup
time
t
su(D)
[MHz]
[ns]
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
0
100
200
300
400
500
175
147
91
496
425
369
325
288
258
232
210
191
175 160
147 135
125 115 106
98
91
85
210
125 106
78
67
58
50
42
36
30
25
20
15
11
8
5
[ MHz]
[ns]
7
8
9
591
10
11
12
13
14
15
16
17
18
19
20
21
135
22
125
23
24
25
0
100
200
283
300
400
500
600
700
766
800
900
1000
668
527
241
47
4
180
158
138
463
533
408
362
241
208
891
429
391
357
328
302
279
259
224 209
195 182
171
622
324
292
265
241
220 202
185 171
158 146
116 108
336
122
108
95
84
74
65
58
50
44
38
33
28
No wait
Wait 1 is valid.
Wait 0 is valid.
Address
access
time
t
a(AD)
g
System clock (Main clock) frequency f(XIN)
g Address decode time and address latch delay time are not considered.
No wait
System clock (Main clock) frequency f(XIN)
Wait 1 or Wait 0 is valid.
Fig. 17.1.2 Relationship between ta(AD), tsu(D) and f(XIN)
17.1 Memory expansion