AS4C64M8D1
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
Idle(3)
Any
CKEn-1 CKEn DM BA0,1 A10 A0-9, 11-12
CS RAS CAS
WE
H
L
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
Active(3)
Active(3)
Active(3)
Active(3)
Idle
H
H
H
H
L
L
Column
address
(A0 ~ A9)
Write
Write and AutoPrecharge
Read
H
L
L
L
Column
address
(A0 ~ A9)
L
H
H
L
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
Active(4)
Burst Stop
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 Power Down Mode Exit
Active
H
L
Any
H
(PowerDown)
Data Input Mask Disable
Data Input Mask Enable
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.
Confidential
6
Rev.2.0
Oct. /2014
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
