170
T
p
Address bus
ø
RD
RAS
UCAS
,
LCAS
External read
Idle cycle
Data bus
T
r
T
c1
T
c2
T
1
DRAM space read
DRAM space read
T
2
T
c2
T
3
T
i
T
i
T
c1
Figure 4.50 Example of Idle Cycle Operation after DRAM Access (1)
(Consecutive Reads in Different Areas) (IDLC = 0, RAST = 0, CAST = 0)
T
p
Address bus
ø
RD
RAS
HWR
,
LWR
UCAS
,
LCAS
External write
Idle cycle
Data bus
T
r
T
c1
T
c2
T
1
DRAM space read
DRAM space read
T
2
T
c2
T
3
T
i
T
c1
Figure 4.51 Example of Idle Cycle Operation after DRAM Access (2)
(Read after Write) (IDLC = 0, RAST = 0, CAST = 0)
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