r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 310

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 6 Bus Controller (BSC)
Rev. 1.00 Sep. 19, 2008 Page 282 of 1270
REJ09B0466-0100
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