HYB18L256160B Datasheet, PDF (44/58 Pages) Qimonda AG – DRAMs for Mobile Applications 256-Mbit Mobile-RAM

Data Sheet
HY[B/E]18L256160B[C/F]L-7.5
256-Mbit Mobile-RAM
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 35) 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
This chapter contains the function truth tables.
TABLE 16
Current State Bank n - Command to Bank n
Current State CS RAS CAS WE Command / Action
Note
Any
H X X X DESELECT (NOP / continue previous operation)
L
H
H
H
NO OPERATION (NOP / continue previous operation)
Idle
L
L
H
H
ACTIVE (select and activate row)
L
L
L
H
AUTO REFRESH
L
L
L
L
MODE REGISTER SET
L
L
H
L
PRECHARGE
Row Active
L
H
L
H
READ (select column and start READ burst)
L
H
L
L
WRITE (select column and start WRITE burst)
L
L
H
L
PRECHARGE (deactivate row in bank or banks)
Read
L
H
L
H
READ (select column and start new READ burst)
(Auto-Precharge _L
H
L
L
WRITE (select column and start new WRITE burst)
Disabled)
L
L
H
L
PRECHARGE (truncate READ burst, start precharge)
L
H
H
L
BURST TERMINATE
Write
L
H
L
H
READ (select column and start READ burst)
(Auto-Precharge _L
H
L
L
WRITE (select column and start WRITE burst)
Disabled)
L
L
H
L
PRECHARGE (truncate WRITE burst, start precharge)
L
H
H
L
BURST TERMINATE
1)2)3)4)5)6)
1) to 6)
1) to 6)
1) to 7)
1) to 7)
1) to 6), 8)
1) to 6), 9)
1) to 6), 9)
1) to 6), 10)
1) to 6), 9)
1) to 6), 9)
1) to 6), 10)
1) to 6), 11)
1) to 6), 9)
1) to 6), 9)
1) to 6), 10)
1) to 6), 11)
1) This table applies when CKEn-1 was HIGH and CKEn is HIGH and after t_RC has been met (if the previous state was self refresh).
2) This table is bank-specific, except where noted, i.e., the current state is for a specific bank and the commands shown are those allowed
to be issued to that bank when in that state. Exceptions are covered in the notes below.
3) Current state definitions, see Table 17
4) The following states must not be interrupted by a command issued to the same bank. DESELECT or NOP commands, or allowable
commands to the other bank should be issued on any clock edge occurring during these states. Allowable commands to the other bank
are determined by its current state and according to Table 20, see also Table 18.
5) The following states must not be interrupted by any executable command; DESELECT or NOP commands must be applied on each
positive clock edge during these states, see Table 19
6) All states and sequences not shown are illegal or reserved.
7) Not bank-specific; requires that all banks are idle and no bursts are in progress.
8) Same as NOP command in that state.
Rev. 1.73, 2006-09
44
01302004-CZ2R-J9SE