r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 318

• Manufacturer Part Number: r4f2456
• 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 288 of 1342
REJ09B0467-0100
DQMU, DQML
Precharge-sel
Address bus
HWR, LWR
Data bus
CKE
CAS
RAS
WE
RD
φ
Figure 6.87 Example of Idle Cycle Operation in RAS Down Mode
PALL ACTV READ
Column
address
T
p
(Write after Read) (IDLC = 0, CAS Latency 2)
Continuous synchronous
DRAM space read
address
address
Row
Row
T
r
T
Column address 1
c1
T
cl
High
High
T
c2
External space read
T
External address
External address
1
NOP
T
2
T
3
Idle cycle
T
Continuous synchronous
DRAM space write
i
Column address 2
T
c1
WRIT
T
Cl
NOP
T
c2