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SH7708 数据表(PDF) 272 Page - Renesas Technology Corp

部件名 SH7708
功能描述  SuperH??RISC engine
PDF  633 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

SH7708 数据表(HTML) 272 Page - Renesas Technology Corp

Back Button SH7708 Datasheet HTML 268Page - Renesas Technology Corp SH7708 Datasheet HTML 269Page - Renesas Technology Corp SH7708 Datasheet HTML 270Page - Renesas Technology Corp SH7708 Datasheet HTML 271Page - Renesas Technology Corp SH7708 Datasheet HTML 272Page - Renesas Technology Corp SH7708 Datasheet HTML 273Page - Renesas Technology Corp SH7708 Datasheet HTML 274Page - Renesas Technology Corp SH7708 Datasheet HTML 275Page - Renesas Technology Corp SH7708 Datasheet HTML 276Page - Renesas Technology Corp Next Button
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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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