HD6417750 Datasheet, PDF (484/1039 Pages) Renesas Technology Corp – SuperH RISC engine

RTCNT value
RTCOR-1
RTCNT cleared to 0 when
RTCNT = RTCOR
H'00000000
RTCSR.CKS2–0
= 000 ≠ 000
Refresh
request
External bus
Refresh request cleared
by start of refresh cycle
Auto-refresh cycle
Figure 13.39 Auto-Refresh Operation
CKIO
TRr1 TRr2 TRr3 TRr4 TRrw TRr5 Trc Trc Trc
Time
RD/
DQMn
D63–D0
CKE
Figure 13.40 Synchronous DRAM Auto-Refresh Timing
Rev. 6.0, 07/02, page 432 of 986