401
Tp
t
AD
t
AD
t
AS2
t
AH2
t
CSD2
t
PCH1
t
AS3
t
CSD3
t
CASD1
t
AH3
t
CASD2
t
CASW2
t
AC2
t
AA5
t
AC7
t
WRD2
t
WDD
t
WDS2
t
WDH3
t
WCS2
t
WCH2
t
RDH2
t
OED2
t
OED1
ø
A23 to A0
RAS5
to
RAS2
UCAS
LCAS
OE
,
RD
HWR
D15 to D0
OE
,
RD
HWR
D15 to D0
AS
Tr
Tc1
Tc2
Tc3
Write
Read
DACK
and
EDACK
timing: when DDS = 0 and EDDS = 0
RAS
timing: when RAST = 1
Note:
DACK0
,
DACK1
EDACK0
to
EDACK3
t
DACD1
t
DACD2
t
EDACD1
t
EDACD2
t
WRD2
t
RDS2
Figure 7.16 DRAM Access Timing: Three-State Access (RAST = 1)
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