HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 488

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

HITACHI 480
Notes: 1.
WRH, WRL,
WRH, WRL,
AD15–AD0
AD15–AD0
DPH, DPL
DPH, DPL
RD(Write)
RD(Read)
A21–A0
DACK0
DACK1
DACK0
DACK1
(Read)
(Read)
(Read)
(Write)
(Write)
(Write)
(Write)
2.
3.
4.
RAS
CAS
CK
For t
instead of t
For t
For t
t
RDH
Figure 19.24 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
cyc
cyc
cyc
p
AD
– 44 instead of t
– t
0.65 – 35 (for 35% duty) or t
1.5 – 35 instead of t
ASC
t
AD
t
RASD1
– t
RDS
T
r
.
t
WPDD2
Row
t
cyc
WSD3
t
RAH
– t
t
cyc
ACC1
t
t
t
t
AD
t
DACD4
AD
RDD
WDD2
RAC1
– t
*
t
2
WCS
1.5 – t
*
RDS
3
T
t
cyc
Column
c
t
CAC1
t
t
ASC
DACD1
DACD5
.
t
RASD1
DS
*
1
t
0.5 – 35 (for 50% duty)
WCH
t
RDS
t
t
t
t
t
t
DACD2
WPDH
RASD2
CASD1
WDH
RSD
– t
RDS
t
WSD4
t
.
RDH
*
4