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SH7708 Datasheet(PDF) 272 Page - Renesas Technology Corp

No. de pieza SH7708
Descripción Electrónicos  SuperH??RISC engine
PDF  633 Pages
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
Página de inicio  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7708 Datasheet(HTML) 272 Page - Renesas Technology Corp

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254
TRc
TRr1
TRrw
TSR1
TSR1
TSR2
(Tpc)
CKIO
RD/
WR
RAS
CASxx
CS2 or CS3
(Tpc)
(High)
Figure 10.22 DRAM Self-Refresh Cycle Timing
Power-On Sequence: For DRAM after powering on, a minimum wait time of 100 µs or 200 µs,
or more during which no access can be performed, should be provided, followed by the prescribed
number (usually 8 or more) of dummy CAS-before-RAS refresh cycles. As the bus state controller
does not perform any special operations for a power-on reset, the power-on sequence must be
carried out by the initialization program executed after a power-on reset.



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