AS4C16M16D1
Operation Mode
Fully synchronous operations are performed to latch the commands at the positive edges of CK. Table 3
shows the truth table for the operation commands.
Table 3. Truth Table (Note (1), (2))
Command
BankActivate
State CKEn-1 CKEn DM BA0,1 A10
A0-9, 11-12
CS RAS CAS
WE
H
L
Idle(3)
Any
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
X
X
X
X
X
X
X
X
X
X
X
X
H
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
V
V
X
V
V
V
V
Row address
L
L
L
L
L
L
L
L
L
L
L
H
L
L
H
L
H
L
H
L
H
L
H
L
X
X
L
L
H
H
H
L
BankPrecharge
PrechargeAll
L
H
L
X
X
Any
L
L
Write
Active(3)
Active(3)
Active(3)
Active(3)
Idle
H
H
H
H
L
L
Column address
(A0 ~ A8)
Write and AutoPrecharge
Read
H
L
L
L
L
H
H
L
Column address
(A0 ~ A8)
Read and Autoprecharge
Mode Register Set
Extended MRS
No-Operation
H
L
OP code
L
Idle
OP code
L
L
L
Any
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
H
H
X
L
H
H
X
L
H
L
Burst Stop
Active(4)
Device Deselect
AutoRefresh
Any
X
H
H
X
H
X
H
X
H
X
V
X
H
X
X
Idle
SelfRefresh Entry
SelfRefresh Exit
Idle
L
L
Idle
H
X
H
X
H
X
H
X
V
X
H
X
X
X
H
X
H
X
H
X
V
X
H
X
X
(SelfRefresh)
Precharge Power Down
Mode Entry
Idle
H
L
L
H
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Precharge Power Down
Mode Exit
Any
(PowerDown)
Active Power Down Mode
Entry
Active
H
L
Active Power Down Mode
Exit
Any
H
(PowerDown)
Data Input Mask Disable
Data Input Mask Enable(5)
Active
Active
H
H
X
X
L
X
X
X
X
X
X
H
Note: 1. V=Valid data, X=Don't Care, L=Low level, H=High level
2. CKEn signal is input level when commands are provided.
CKEn-1 signal is input level one clock cycle before the commands are provided.
3. These are states of bank designated by BA signal.
4. Device state is 2, 4, and 8 burst operation.
5. LDM and UDM can be enabled respectively.
Alliance Memory, lnc. Confidential
6
Rev. 1.1
Sep. /2011