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| SH7708 Datasheet, PDF (544/633 Pages) Renesas Technology Corp – SuperH™ RISC engine | |||
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CKIO
RAS
CASxx
RD/WR
TRc
TRr1
TRrw
TRr2
(Tpc)
tRASD1
tCASD1
tRASD1
tCASD1
tRWD
CS2 or CS3
(High)
Figure 17.31 DRAM CAS-Before-RAS Refresh Cycle (TRAS = 0, TPC = 0)
CKIO
RAS
CASxx
RD/WR
TRc
TRr1 TRrw TRrw
TRrw TRrw TRr2
(Tpc) (Tpc) (Tpc)
tRASD1
tCASD1
tRWD
tRASD1
tCASD1
CS2 or CS3
(High)
Figure 17.32 DRAM CAS-Before-RAS Refresh Cycle (TRAS = 3, TPC = 2)
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