AS4C256M16D3
Operation Mode Truth Table
Table 3. Truth Table (Note (1), (2))
(3)
CKEn-1 CKEn DM BA0-2 A10/AP A0-9, 11, 13-14 A12/BC# CS# RAS# CAS# WE#
Command
State
Idle(4)
BankActivate
H
H
H
H
H
H
H
H
H
H
H
H
X
X
X
X
X
X
V
V
V
V
V
V
Row address
L
L
L
L
L
L
L
L
H
H
H
L
H
L
L
L
L
L
Single Bank Precharge
All Banks Precharge
Any
L
H
L
L
L
V
V
V
V
V
V
V
V
L
Any
L
Write (Fixed BL8 or BC4)
Write (BC4, on the fly)
Write (BL8, on the fly)
Active(4)
Active(4)
Active(4)
H
H
H
L
H
L
Write with Autoprecharge
(Fixed BL8 or BC4)
Active(4)
Active(4)
Active(4)
H
H
H
H
H
H
X
X
X
V
V
V
H
H
H
V
V
V
V
L
L
L
L
H
H
H
L
L
L
L
L
L
Write with Autoprecharge
(BC4, on the fly)
Write with Autoprecharge
(BL8, on the fly)
H
Read (Fixed BL8 or BC4)
Active(4)
Active(4)
Active(4)
H
H
H
H
H
H
X
X
X
V
V
V
L
L
L
V
V
V
V
L
L
L
L
H
H
H
L
L
L
H
H
H
Read (BC4, on the fly)
Read (BL8, on the fly)
H
Read with Autoprecharge
(Fixed BL8 or BC4)
Active(4)
Active(4)
Active(4)
H
H
H
H
H
H
X
X
X
V
V
V
H
H
H
V
V
V
V
L
L
L
L
H
H
H
L
L
L
H
H
H
Read with Autoprecharge
(BC4, on the fly)
Read with Autoprecharge
(BL8, on the fly)
H
(Extended) Mode Register Set
No-Operation
Idle
Any
H
H
H
H
H
H
H
H
H
X
H
L
X
X
X
X
X
X
V
V
X
X
V
V
X
V
X
V
X
V
X
X
X
X
OP code
L
L
L
H
X
H
L
L
H
X
H
L
L
H
X
L
V
X
X
V
V
X
V
X
V
X
V
X
X
H
L
V
X
X
V
V
X
V
X
V
X
V
X
X
X
X
V
X
X
V
V
X
V
X
V
X
V
X
X
X
X
Device Deselect
Burst Stop
Any
H
L
Active(5)
Idle
Refresh
L
H
H
X
H
X
H
X
H
X
X
L
SelfRefresh Entry
Idle
L
L
L
H
L
X
H
X
H
X
H
X
X
H
H
X
H
X
H
X
H
X
X
H
H
SelfRefresh Exit
Idle
Idle
Any
L
H
L
H
L
X
X
X
H
L
Power Down Mode Entry
Power Down Mode Exit
H
L
H
Data Input Mask Disable
Data Input Mask Enable(6)
ZQ Calibration Long
Active
Active
Idle
H
H
H
H
X
X
H
H
L
H
X
X
X
X
L
ZQ Calibration Short
Idle
L
L
NOTE 1: V=Valid data, X=Don't Care, L=Low level, H=High level
NOTE 2: CKEn signal is input level when commands are provided.
NOTE 3: CKEn-1 signal is input level one clock cycle before the commands are provided.
NOTE 4: These are states of bank designated by BA signal.
NOTE 5: Device state is 4, and 8 burst operation.
NOTE 6: LDM and UDM can be enabled respectively.
Confidential
8
Rev. 3.0
Aug. /2014
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
