參數(shù)資料
型號(hào)： HYB18T512800AF-37
廠商： INFINEON TECHNOLOGIES AG
英文描述： 512-Mbit Double-Data-Rate-Two SDRAM
中文描述： 512兆雙數(shù)據(jù)速率2內(nèi)存
文件頁數(shù)： 60/96頁
文件大?。?/td> 1571K
代理商： HYB18T512800AF-37
Active
Power-Down
Exit
HYB18T512[400/800/160]A[C/F]–[3.7/5]
512-Mbit Double-Data-Rate-Two SDRAM
Functional Description
Data Sheet
60
Rev. 1.13, 2004-05
09112003-SDM9-IQ3P
Power-Down Entry
Active Power-down mode can be entered after an
Activate command. Precharge Power-down mode can
be entered after a Precharge, Precharge-All or internal
precharge command. It is also allowed to enter power-
mode after an Auto-Refresh command or MRS /
EMRS(1) command when
t
MRD
is satisfied.
Active Power-down mode entry is prohibited as long as
a Read Burst is in progress, meaning CKE should be
kept high until the burst operation is finished. Therefore
Active Power-Down mode entry after a Read or Read
with Auto-Precharge command is allowed after
RL + BL/2 is satisfied.
Active Power-down mode entry is prohibited as long as
a Write Burst and the internal write recovery is in
progress. In case of a write command, active power-
down mode entry is allowed when WL + BL/2 +
t
WTR
is
satisfied.
In case of a write command with Auto-Precharge,
Power-down mode entry is allowed after the internal
precharge command has been executed, which is WL
+ BL/2 + WR starting from the write with Auto-
Precharge command. In this case the DDR2 SDRAM
enters the Precharge Power-down mode.
Figure 54
Active Power-Down Mode Entry and Exit after an Activate Command
Note:Active Power-Down mode exit timing
t
XARD
(“fast exit”) or
t
XARDS
(“slow exit”) depends on the programmed
state in the MRS, address bit A12.
Figure 55
Active Power-Down Mode Entry and Exit Example after a Read Command:
RL = 4 (AL = 1, CL =3), BL = 4
Note:Active Power-Down mode exit timing t
XARD
(“fast exit”) or t
XARDS
(“slow exit”) depends on the programmed
state in the MRS, address bit A12.
NOP
NOP
Activate
T0
T2
T1
CMD
NOP
Tn
Tn+1
CKE
Active
Power-Down
Entry
NOP
NOP
Act.PD 0
tIS
Tn+2
tIS
Valid
Comm and
tXARD or
tXARDS *)
CK, CK
NOP
NOP
READ
READ w/AP
T0
T2
T1
T3
T4
T5
T6
T7
T8
Dout A0
Dout A1
Dout A2
Dout A3
RL = 4
CL = 3
CMD
DQ
DQS,
DQS
NOP
NOP
NOP
NOP
NOP
NOP
Tn
Tn+1
CKE
AL = 1
Active
Power-Down
Entry
RL + BL/2
NOP
NOP
Act.PD 1
tIS
Tn+2
tIS
Active
Power-Down
Exit
Valid
Command
tXARD or
tXARDS *)
CK, CK
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