HY[B/E]18L256160B[C/F]X-7.5
256-Mbit Mobile-RAM
Functional Description
3) Current state definitions:
Idle:
The bank has been precharged, and tRP has been met.
Row Active:
A row in the bank has been activated, and tRCD has been met. No data bursts/accesses and no register
accesses are in progress.
Read:
Write:
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.
Read with AP
Enabled:
Starts with registration of a READ command with Auto Precharge enabled and ends when tRP has been
met. Once tRP is met, the bank is in the idle state.
Write with AP
Enabled:
Starts with registration of a WRITE command with Auto Precharge enabled and ends when tRP has been
met. Once tRP 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
Current State
Power Down
Command
Action
Notes
1)2)3)4)
L
L
X
X
X
X
Maintain Power Down
Maintain Self Refresh
Maintain Clock Suspend
1) to 4)
1) to 4)
1) to 4)
Self Refresh
Clock Suspend
Deep Power Down
Maintain Deep Power
Down
1) to 4)
1) to 5)
1) to 4)
1) to 4), 6)
1) to 4)
L
H
L
Power Down
DESELECT or NOP
Exit Power Down
Self Refresh
DESELECT or NOP
Exit Self Refresh
Clock Suspend
Deep Power Down
All Banks Idle
X
Exit Clock Suspend
Exit Deep Power Down
X
H
DESELECT or NOP
Enter Precharge Power
Down
1) to 4)
1) to 4)
1) to 4)
1) to 4)
Bank(s) Active
All Banks Idle
DESELECT or NOP
AUTO REFRESH
(valid)
Enter Active Power Down
Enter Self Refresh
Read / Write burst
Enter Clock Suspend
H
H
see Table 14 and Table 15
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 tRC period.
6) Exit from DEEP POWER DOWN requires the same command sequence as for power-up initialization.
Data Sheet
39
Rev. 1.11, 2007-01
07142005-CR47-RB2E
QIMONDA [ QIMONDA AG ]
