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7721 Datasheet(PDF) 413 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) 413 Page - Renesas Technology Corp

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APPLICATION
7721 Group User’s Manual
16–10
16.1 Memory connection
q Timing for writing data to DRAM
Fig. 16.1.7 Timing for writing data to DRAM
Data hold time : tDH
≤ tw(EL) – td(E-CASL) + th(E-DLQ/DHQ)
Table 16.1.5 lists the calculation formula and value for each parameter in Figure 16.1.7. Figure
16.1.8 shows the relationship between tDH and f(XIN).
DRAM write signal W
tw(EL)
td(E-CASL)
Row address
Column address
Address
Data
td(E-DLQ/DHQ)
tDH
th(E-DLQ/DHQ)
V This applies when the external data bus has a width of 16 bits (BYTE = “L”).
E
RAS
CAS
Address output
(MA0–MA7)
Address output and Data I/O
A8/D8–A15/D15
A16/D0–A23/D7
: Specifications of the M37721
(The others are specifications of DRAM.)
V



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