HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 704

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

21.4.2 Refresh Controller Bus Timing
Refresh controller bus timing is shown as follows:
•
•
ø
A
AS
CS (RAS)
RD (CAS)
HWR (UW),
LWR (
(read)
HWR (UW),
LWR (
(write)
RFSH
D
(read)
D
(write)
9
15
15
to A
3
DRAM bus timing
Figures 21-10 to 21-15 show the DRAM bus timing in each operating mode.
PSRAM bus timing
Figures 21-16 and 21-17 show the pseudo-static RAM bus timing in each operating mode.
to D
to D
LW
LW
1
0
0
)
)
Figure 21-10 DRAM Bus Timing (Read/Write): Three-State Access
t
t
AD
RAD1
t
AS1
T
1
t
RAH
t
ASD
t
t
AD
WDS3
—
t
RAC
t
AS1
2WE Mode —
T
2
t
t
AA
ASD
696
t
CAC
t
t
RDS
CAS
T
3
t
RAD3
t
t
SD
SD
t
WDH
t
t
RDH
t
CRP
RP