HYB18L256160B Datasheet, PDF (47/58 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
Idle
Row Active
Read
Write
Read with AP
Enabled
Write with AP
Enabled
TABLE 21
Current state definitions
The bank has been precharged, and t_RP has been met
A row in the bank has been activated, and t_RCD has been met. No data bursts/accesses and no
register accesses are in progress
A READ burst has been initiated, with Auto Precharge disabled, and has not yet terminated or
been terminated
A WRITE burst has been initiated, with Auto Precharge disabled, and has not yet terminated or
been terminated
Starts with registration of a READ command with Auto Precharge enabled and ends when t_RP
has been met. Once t_RP is met, the bank is in the idle state
Starts with registration of a WRITE command with Auto Precharge enabled and ends when t_RP
has been met. Once t_RP is met, the bank is in the idle state
TABLE 22
Truth Table - CKE
CKEn-1 CKEn Current State
Command
Action
Note
L
L
Power Down
X
Maintain Power Down
Self Refresh
X
Maintain Self Refresh
Clock Suspend
X
Maintain Clock Suspend
Deep Power Down
X
Maintain Deep Power Down
L
H
Power Down
DESELECT or NOP
Exit Power Down
Self Refresh
DESELECT or NOP
Exit Self Refresh
Clock Suspend
X
Exit Clock Suspend
Deep Power Down
X
Exit Deep Power Down
H
L
All Banks Idle
DESELECT or NOP
Enter Precharge Power Down
Bank(s) Active
DESELECT or NOP
Enter Active Power Down
All Banks Idle
AUTO REFRESH
Enter Self Refresh
Read / Write burst
(valid)
Enter Clock Suspend
H
H
See Table 16 and Table 20
1) CKEn is the logic state of CKE at clock edge n; CKEn-1 was the state of CKE at the previous clock edge.
2) Current state is the state immediately prior to clock edge n.
3) COMMAND n is the command registered at clock edge n; ACTION n is a result of COMMAND n.
4) All states and sequences not shown are illegal or reserved.
5) DESELECT or NOP commands should be issued on any clock edges occurring during t_RC period.
6) Exit from DEEP POWER DOWN requires the same command sequence as for power-up initialization.
1)2)3)4)
1) to 4)
1) to 4)
1) to 4)
1) to 4)
1) to 5)
1) to 4)
1) to 4), 6)
1) to 4)
1) to 4)
1) to 4)
1) to 4)
1) to 4)
Rev. 1.73, 2006-09
47
01302004-CZ2R-J9SE