HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 472

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

HITACHI 464
Notes: 1.
WRH, WRL,
WRH, WRL,
AD15–AD0
AD15–AD0
RD(Write)
DPH, DPL
DPH, DPL
RD(Read)
A21–A0
DACK0
DACK1
DACK0
DACK1
(Read)
(Read)
(Write)
(Write)
(Write)
(Write)
(Read)
RAS
CAS
2.
3.
4.
CK
For t
instead of t
For t
For t
t
RDH
Figure 19.11 DRAM Bus Cycle (Short Pitch, Normal Mode)
CAC1
ACC1
RAC1
is measured from A21–A0, RAS, or CAS, whichever is negated first.
, use t
, use t
, use t
cyc
T
– t
p
cyc
cyc
cyc
AD
– 30 instead of t
– t
0.65 – 19 (for 35% duty) or t
1.5 – 20 instead of t
ASC
t
AD
– t
t
RAC1
RDS
T
r
*
t
RASD1
3
.
t
WPDD2
Row
cyc
t
RAH
t
– t
ACC1
cyc
t
t
t
t
t
t
WSD3
WDD2
AD
RDD
DACD4
AD
ASC
t
CAC1
*
2
– t
1.5 – t
RDS
T
*
1
cyc
c
t
t
DACD1
DACD5
.
Column
t
WCS
t
RASD1
DS
0.5 – 19 (for 50% duty)
t
WCH
t
t
t
t
t
RDS
t
t
t
WPDH
DACD2
RASD2
CASD1
WSD4
RSD
WDH
– t
RDS
t
.
RDH
*
4