HY[B/E]18L128160B[C/F]-7.5
128-Mbit Mobile-RAM
Functional DescriptionFunction Truth Tables
#,+
#+%
T20
02%
./0
./0
./0
6ALID
6ALID
6ALID
#OMMAND
!DDRESS
0RE !LL
!ꢅꢄ ꢇ!0ꢈ
$1
(IGHꢀ:
0OWER $OWN
%NTRY
%XIT FROM
0OWER $OWN
!NY
#OMMAND
0RECHARGE 0OWER $OWN MODE SHOWNꢁ ALL BANKS ARE IDLE AND T20 MET
WHEN 0OWER $OWN %NTRY #OMMAND IS ISSUED
ꢃ $ONgT #ARE
Figure 46 Power Down Entry and Exit
2.4.10.1 DEEP POWER DOWN
The deep power down mode is an unique function on Low Power SDRAM devices with extremely low current
consumption. Deep power down mode is entered using the BURST TERMINATE command (cf. Figure 18) except
that CKE is LOW. All internal voltage generators inside the device are stopped and all memory data is lost in this
mode. To enter the deep power down mode all banks must be precharged.
The deep power down mode is asynchronously exited by asserting CKE HIGH. After the exit, the same command
sequence as for power-up initialization, including the 200µs initial pause, has to be applied before any other
command may be issued (cf. Figure 3 and Figure 4).
2.5
Function Truth Tables
Table 15
Current State Bank n - Command to Bank n
Current State CS RAS CAS WE Command / Action
Notes
1)2)3)4)5)6)
Any
H
L
L
L
L
L
L
L
L
X
H
L
X
H
H
L
X
H
H
H
L
DESELECT (NOP / continue previous operation)
NO OPERATION (NOP / continue previous operation)
ACTIVE (select and activate row)
to
to
Idle
to 7)
to
L
AUTO REFRESH
L
L
MODE REGISTER SET
to , 8)
to , 9)
to ,
L
H
L
L
PRECHARGE
Row Active
H
H
L
H
L
READ (select column and start READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE (deactivate row in bank or banks)
L
to , 10)
H
L
Data Sheet
41
Rev. 1.71, 2007-01
05282004-NZNK-8T0D
QIMONDA [ QIMONDA AG ]
