487
CK
A21–A0
RAS
CAS
WRH
,
WRL
,
WR
(Read)
DACK0
DACK1
(Read)
AD15–AD0
DPH, DPL
(Read)
WRH
,
WRL
,
WR
(Write)
AD15–AD0
(Write)
DACK0
DACK1
(Write)
DPH, DPL
(Write)
T
p
T
r
T
c1
T
c2
T
c1
T
c2
t
AD
t
AD
t
RASD1
t
RASD2
t
CASD3
t
CASD2
t
RDH
*
5
t
CASD3
t
RDH
*
4
t
RAC2
*
3
t
ACC2
*
2
t
CAC2
*
1
t
RDS
t
DACD1
t
DACD1
t
DACD2
t
DACD2
t
WSD1
t
WSD1
t
WSD2
t
WSD2
t
WDD1
t
WDH
t
WDD1
t
WDH
t
WPDD1
t
WPDD1
t
WPDH
t
WPDH
t
DACD3
t
DACD3
t
DACD3
t
DACD3
Column
Column
RD
(Write)
RD
(Read)
t
RDD
t
RSD
Row
Notes:
*
1 For t
CAC2
, use t
cyc
×
(n + 1) – 25 instead of t
cyc
×
(n + 1) – t
CASD2
– t
RDS
.
*
2 For t
ACC2
, use t
cyc
×
(n + 2) – 30 instead of t
cyc
×
(n + 2) – t
AD
– t
RDS
.
*
3 For t
RAC2
, use t
cyc
×
(n + 2.5) – 20 instead of t
cyc
×
(n + 2.5) – t
RASD2
– t
RDS
.
*
4 t
RDH
is measured from A21–A0 or
CAS
, whichever is negated first.
*
5 t
RDH
is measured from A21–A0,
RAS
, or
CAS
whichever is negated first.
Figure 20.14 DRAM Bus Cycle: (Long-Pitch, High-Speed Page Mode)
Содержание HD6417032
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Страница 525: ...490 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 18 Self Refresh ...
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