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7721 Datasheet(PDF) 392 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) 392 Page - Renesas Technology Corp

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14-9
7721 Group User’s Manual
DRAM CONTROLLER
14.4 DRAMC operation
Fig. 14.4.1 Waveform example of DRAM control signals
Column address
E
RAS
CAS
R/W
(a) At reading
Row address
Column address
Address
Data
Read cycle (1 bus cycle)
MA0–MA9
A16/D0–A23/D7
A8/D8–A15/D15
E
RAS
CAS
R/W
MA0–MA9
A16/D0–A23/D7
A8/D8–A15/D15
(c) At refresh
Undefined
Refresh cycle
Undefined
Undefined
Floating
Transition of right to use bus
E
RAS
CAS
R/W
MA0–MA9
A16/D0–A23/D7
A8/D8–A15/D15
(b) At writing
Row address
Address
Data
Write cycle (1 bus cycle)
Undefined
Transition of right to use bus



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