EtronTech
EM6A9160
8Mx16 DDR SDRAM
Operation Mode
Fully synchronous operations are performed to latch the commands at the positive edges of CK. Table 2
shows the truth table for the operation commands.
Table 2. Truth Table (Note (1), (2) )
Command
State
Idle(3)
Any
CKEn-1 CKEn UDM UDM BS /CS /RAS /CAS /WE
A
A
0,1 10 0-9,11
BankActivate
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
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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
H
L
BankPrecharge
PrechargeAll
V
X
V
V
V
V
L
H
L
X
X
Any
L
L
Active(3)
Active(3)
Active(3)
Active(3)
Idle
H
H
H
H
L
L
Write
Column
address
Write and AutoPrecharge
Read
H
L
L
L
(A0 ~ A8)
Column
address
L
H
H
L
Read and Autoprecharge
Mode Register Set
Extended MRS
No-Operation
H
L
(A0 ~ A8)
OP code
L
Idle
OP code
L
L
L
Any
Active(4)
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
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
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
L
X
X
X
X
X
X
H
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 BS signal.
4. Device state is 1, 2, 4, 8, and full page burst operation.
5. LDM and UDM can be enable respectively.
6
Rev. 1.4
May 2006
ETRON [ ETRON TECHNOLOGY, INC. ]
