497
T
1
T
2
t
AD
t
RDD
t
CSD2
t
RSD
t
RDAC2
*
1
t
ACC2
*
2
t
RDS
t
RDH
*
3
t
DACD2
t
DACD1
t
WSD2
t
WSD1
t
DACD3
t
DACD3
t
WDH
t
WDD1
t
WPDH
t
WPDD1
CK
A21–A0
HBS
,
LBS
CSn
DACK0
DACK1
(Read)
RD
(Read)
WRH
,
WRL
,
WR
(Write)
AD15–AD0
DPH, DPL
(Read)
AD15–AD0
(Write)
DPH, DPL
(Write)
DACK0
DACK1
(Write)
t
CSD1
Notes:
*
1 For t
RDAC2
, use t
cyc
×
(n + 1.65) – 35 (for 35% duty) or t
cyc
×
(n + 1.5) – 35 (for
50% duty) instead of t
cyc
×
(n + 2) – t
RDD
– t
RDS
.
*
2 For t
ACC2
, use t
cyc
×
(n + 2) – 44 instead of t
cyc
×
(n + 2) – t
AD
(or t
CSD1
) – t
RDS480
.
*
3 t
RDH
is measured from A21–A0,
CSn
, or
RD
, whichever is negated first.
Figure 20.22 Basic Bus Cycle: Two-State Access
Содержание HD6417032
Страница 21: ......
Страница 35: ...xiv ...
Страница 85: ...50 ...
Страница 101: ...66 ...
Страница 129: ...94 ...
Страница 135: ...100 ...
Страница 343: ...308 ...
Страница 369: ...334 ...
Страница 383: ...348 ...
Страница 475: ...440 ...
Страница 525: ...490 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 18 Self Refresh ...
Страница 578: ...543 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 62 Self Refresh ...
Страница 689: ...654 ...