HYB18L256169BF Datasheet, PDF (39/48 Pages) Qimonda AG – 256-Mbit Mobile-RAM

HY[B/E]18L256169BF-7.5
256-Mbit Mobile-RAM
Functional Description
3) Current state definitions:
Idle:
Row Active:
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.
Read:
A READ burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been
terminated.
Write:
A WRITE burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been
terminated.
Read with AP
Enabled:
Write with AP
Enabled:
Starts with
met. Once
registration of
t_RP is met, the
a READ command with Auto
bank is in the idle state.
Precharge
enabled
and
ends
when
t_RP
has
been
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.
4) AUTO REFRESH, SELF REFRESH and MODE REGISTER SET commands may only be issued when all banks are idle.
5) A BURST TERMINATE command cannot be issued to another bank; it applies to the bank represented by the current state
only.
6) All states and sequences not shown are illegal or reserved.
7) READs or WRITEs listed in the Command/Action column include READs or WRITEs with Auto Precharge enabled and
READs or WRITEs with Auto Precharge disabled.
8) Requires appropriate DQM masking.
9) Concurrent Auto Precharge: bank n will start precharging when its burst has been interrupted by a READ or WRITE
command to bank m.
Table 16 Truth Table - CKE
CKEn-1 CKEn
L
L
Current State
Power Down
Self Refresh
Command
X
X
Action
Maintain Power Down
Maintain Self Refresh
Notes
1)2)3)4)
1) to 4)
Clock Suspend
X
Maintain Clock Suspend ^{1) to 4)}
Deep Power Down
X
Maintain Deep Power
1) to 4)
Down
L
H
Power Down
DESELECT or NOP
Exit Power Down
1) to 4)
Self Refresh
DESELECT or NOP
Exit Self Refresh
1) to 5)
Clock Suspend
X
Exit Clock Suspend
1) to 4)
Deep Power Down
X
Exit Deep Power Down ^{1) to 4), 6)}
H
L
All Banks Idle
DESELECT or NOP
Enter Precharge Power ^{1) to 4)}
Down
Bank(s) Active
DESELECT or NOP
Enter Active Power Down ^{1) to 4)}
All Banks Idle
AUTO REFRESH
Enter Self Refresh
1) to 4)
Read / Write burst
(valid)
Enter Clock Suspend
1) to 4)
H
H
see Table 14 and Table 15
1) to 4)
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.
Data Sheet
39
Rev. 1.02, 2006-12
02032006-MP0M-7FQG