HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 477

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

WRH, WRL,
WRH, WRL,
AD15–AD0
AD15–AD0
Notes: 1.
DPH, DPL
DPH, DPL
Figure 19.15 DRAM Bus Cycle: (Long Pitch, High-Speed Page Mode + Wait State)
RD(Read)
RD(Write)
A21–A0
DACK0
DACK1
DACK0
DACK1
(Read)
(Read)
(Read)
(Write)
(Write)
(Write)
(Write)
WAIT
RAS
CAS
CK
2.
3.
For t
For t
For t
CAC2
ACC2
RAC2
T
, use t
, use t
, use t
p
cyc
cyc
cyc
(n + 1) – 25 instead of t
(n + 2) – 30 instead of t
(n + 2.5) – 20 instead of t
T
r
Row
t
RDD
T
c1
t
WTS
t
cyc
cyc
WTH
Column
cyc
t
t
t
T
RAC2
CAC2
ACC2
(n + 1) – t
(n + 2) – t
w
(n + 2.5) – t
t
WTS
*
*
*
3
1
2
t
WTH
CASD2
AD
T
– t
RASD1
c2
RDS
– t
RDS
HITACHI 469
.
– t
RDS
.
t
RSD
.