r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 314
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r4f2456
Manufacturer Part Number
r4f2456
Description
16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R4F2456.pdf
(1376 pages)
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- Current page: 314 of 1376
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Section 6 Bus Controller (BSC)
Rev. 1.00 Sep. 19, 2008 Page 284 of 1342
REJ09B0467-0100
UCAS, LCAS
UCAS, LCAS
Address bus
Address bus
(Consecutive Reads in Different Areas) (IDLC = 0, RAST = 0, CAST = 0)
Data bus
Data bus
HWR
Figure 6.82 Example of Idle Cycle Operation in RAS Down Mode
Figure 6.83 Example of Idle Cycle Operation in RAS Down Mode
RAS
RAS
RD
RD
φ
φ
(Write after Read) (IDLC = 0, RAST = 0, CAST = 0)
T
T
p
p
DRAM space read
DRAM space read
T
T
r
r
T
T
c1
c1
T
T
c2
c2
T
T
1
1
External read
External read
T
T
2
2
T
T
3
3
Idle cycle
Idle cycle
DRAM space write
DRAM space read
T
T
i
i
T
T
c1
c1
T
T
c2
c2
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