Data Sheet.
HY[B/E]18L512160BF-7.5
512-Mbit Mobile-RAM
FIGURE 42
Auto Refresh
#,+
T20
T2#
T2#
02%
./0
!2&
./0
./0
!2&
./0
./0
!#4
#OMMAND
!DDRESS
"A !ꢀ
2OW N
2OW N
0RE !LL
!ꢃꢄ ꢅ!0ꢆ
$1
(IGHꢂ:
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2.4.9.2
SELF REFRESH
The SELF REFRESH command can be used to retain data in
the Mobile-RAM, even if the rest of the system is powered
down. When in the self refresh mode, the Mobile-RAM retains
data without external clocking. The SELF REFRESH
command is initiated like an AUTO REFRESH command
except CKE is LOW. Input signals except CKE, are “Don’t
Care” during SELF REFRESH.
The procedure for exiting SELF REFRESH requires a stable
clock prior to CKE returning HIGH. Once CKE is HIGH, NOP
commands must be issued for tRC because time is required
for a completion of any internal refresh in progress.
The use of SELF REFRESH mode introduces the possibility
that an internally-timed event can be missed when CKE is
raised for exit from SELF REFRESH mode. Upon exit from
SELF REFRESH, an extra AUTO REFRESH command is
recommended.
FIGURE 43
SELF REFRESH Entry Command
#,+
#+%
#3
2!3
#!3
7%
!ꢁꢂ!ꢃꢄ
"!ꢁꢅ"!ꢃ
ꢀ $ONgT #ARE
Rev. 1.22, 2006-12
40
01132005-06IU-IGVM
QIMONDA [ QIMONDA AG ]
