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| HYB18M1G16 Datasheet, PDF (45/65 Pages) Qimonda AG – 1-Gbit x16 DDR Mobile-RAM | |||
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Data Sheet
2.4.10 POWER-DOWN
Power-down is entered when CKE is registered LOW (no
accesses can be in progress). If power-down occurs when all
banks are idle, this mode is referred to as precharge power-
down; if power-down occurs when there is a row active in any
bank, this mode is referred to as active power-down. Entering
power-down deactivates the input and output buffers,
excluding CK, CK and CKE. In power-down mode, CKE LOW
must be maintained, and all other input signals are âDonât
Careâ. The minimum power-down duration is specified by
tCKE. However, power-down duration is limited by the refresh
requirements of the device.
The power-down state is synchronously exited when CKE is
registered HIGH (along with a NOP or DESELECT
command). A valid command may be applied tXP after exit
from power-down.
HY[B/E]18M1G16[0/1]BF
1-Gbit DDR Mobile-RAM
FIGURE 37
Power-Down Entry Command
CK
CK
CKE
CS
RAS
CAS
WE
A0-A12
BA0,BA1
= Don't Care
#+
#+
T 20
#+ %
T #+ %
#O MM A N D 0 2%
./ 0
! DD R E SS
! ! 0 0 RE !L L
$1
(I G H
:
./ 0
FIGURE 38
Power-Down Entry and Exit
T 80
./ 0
6A LI D
6A LI D
6A LI D
0 OW ER $O WN
%N TR Y
%X IT F RO M
! N Y
0 O WE R $O WN #O M M AN D
0 R E CH A R G E 0 O WE R $O W N M OD E S H OW N A LL B AN KS A R E ID LE A ND T 20 M E T
W HE N 0 OW E R $O WN % NT R Y #O M MA N D I S I SS U ED
$O Ng T #A R E
Rev.1.0, 2007-03
45
10242006-Y557-TZXW
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