EtronTech
EM68C08CWAE
Operation Mode
The following tables provide a quick reference of available DDR2 SDRAM commands, including CKE power-down
modes and bank-to-bank commands.
Table 4. Truth Table (Note (1), (2))
Command
BankActivate
State CKEn-1 CKEn DM BA0-2 A10 A0-9, 11-13 CS# RAS# CAS# WE#
Idle(3)
H
H
H
H
H
H
H
H
H
H
X
X
X
X
X
V
V
X
V
V
Row address
L
L
L
L
L
L
L
H
H
H
L
H
L
L
L
L
Single Bank Precharge
All Banks Precharge
Write
Any
L
H
L
X
X
Any
L
Active(3)
Active(3)
H
H
Column
address
Write with AutoPrecharge
H
L
(A0 – A9)
Active(3)
Active(3)
H
H
H
H
X
X
V
V
L
L
L
H
H
L
L
H
H
Column
address
Read
Read and Autoprecharge
H
(A0 – A9)
(Extended) Mode Register Set
No-Operation
Idle
Any
Any
Idle
Idle
H
H
H
H
H
H
X
X
H
L
X
X
X
X
X
V
X
X
X
X
OP code
L
L
L
H
X
L
L
H
X
L
L
H
X
H
H
X
H
X
H
X
H
X
X
X
X
X
X
X
X
X
X
Device Deselect
Refresh
H
L
SelfRefresh Entry
L
L
L
H
L
X
H
X
H
X
H
X
X
X
H
X
H
X
H
X
X
SelfRefresh Exit
Idle
Idle
Any
L
H
L
H
L
X
X
X
X
X
X
X
X
X
X
X
X
H
L
Power Down Mode Entry
Power Down Mode Exit
H
L
H
Data Input Mask Disable
Data Input Mask Enable(4)
Active
Active
H
H
X
X
L
X
X
X
X
X
X
X
X
H
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.
CKEn-1 signal is input level one clock cycle before the commands are provided.
NOTE 3: These are states of bank designated by BA signal.
NOTE 4: LDM and UDM can be enabled respectively.
Rev. 1.3
7
Oct. /2015
ETRON [ ETRON TECHNOLOGY, INC. ]
