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7721 Datasheet(PDF) 414 Page - Renesas Technology Corp

Part # 7721
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 Datasheet(HTML) 414 Page - Renesas Technology Corp

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APPLICATION
7721 Group User’s Manual
16–11
16.1 Memory connection
Table 16.1.5 Calculation formula and value for each
parameter in Figure 16.1.7 (unit : ns)
Calculation formula and Value
tw(EL)
td(E-CASL)
td(E-DLQ)
td(E-DHQ)
th(E-DLQ)
th(E-DHQ)
4 ! 109
f(XIN)
–25
80 to 115
1 ! 109
f(XIN)
–22
35
Note: When accessing DRAM, Wait is always inserted
regardless of the contents of the Wait bit,
source’s Wait bit, and destination’s Wait bit.
Fig. 16.1.8 Relationship between tDH and f(XIN)
0
100
200
300
400
500
7
8
9
10
1112
1314
1516
1718
1920
21
22
232425
486.5
415.5
359.5
315.5
278.5
248.5
222.5
200.5
181.5
165.5
150.5
137.5
125.5
115.5 105.5
96.5 88.5
81.5 75.5
[ns]
External clock input frequency
f(XIN)
[MHz]



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