EtronTech
Operation Mode
Table 4 shows the truth table for the operation commands.
EM68916CWQA
Table 4. Truth Table (Note (1), (2))
Command
BankActivate
Single Bank Precharge
All Banks Precharge
Write
Write with AutoPrecharge
Read
Read and Autoprecharge
(Extended) Mode Register Set
No-Operation
Burst Stop
Device Deselect
Refresh
SelfRefresh Entry
SelfRefresh Exit
State
Idle
(3)
Any
Any
Active
(3)
Active
(3)
Active
(3)
Active
(3)
Idle
Any
Active
(4)
Any
Idle
Idle
Idle
Idle
Any
Active
CKE
n-1
CKE
n
UDM LDM BA
0,1
A
10
A
0-9, 11-12
CS# RAS# CAS# WE#
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
L
H
H
H
H
H
H
H
H
H
X
X
X
H
L
H
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
V
V
X
V
V
V
V
V
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Row address
(A0 – A11)
L
L
L
L
L
L
L
L
L
L
H
L
L
H
L
H
L
H
L
X
X
L
L
L
H
H
H
H
L
H
H
X
L
L
X
H
X
H
X
H
X
X
H
H
H
L
L
L
L
L
H
H
X
L
L
X
H
X
H
X
H
X
X
H
L
L
L
L
H
H
L
H
L
X
H
H
X
H
X
H
X
H
X
X
L
H
L
H
L
H
X
X
Column
address
(A0 - A8)
Column
address
(A0 - A8)
OP code
X
X
X
X
X
X
X
X
X
Power Down Mode Entry
Power Down Mode Exit
Data Input Mask Disable
Data Input Mask Enable(5)
Active
H
X
H
H
X
X
X
NOTE 1:
V=Valid data, X=Don't Care, L=Low level, H=High level
NOTE 2:
CKE
n
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.
Etron Confidential
7
Rev. 1.1
Apr. 2009
ETRON [ ETRON TECHNOLOGY, INC. ]
