Et r on Tech
EM658160
4Mx16 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 CKEn-1 CKEn DM BS0,1 A10 A0-9,11 /CS /RAS /CAS /WE
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
X
H
L
X
H
L
X
X
L
L
H
H
H
L
H
L
BankActivate
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
Write
Column
address
(A0 ~ A7)
Write and AutoPrecharge
Read
H
L
L
L
Column
address
(A0 ~ A7)
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
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
X
H
X
X
H
X
X
Idle
SelfRefresh Entry
SelfRefresh Exit
Idle
L
L
Idle
H
X
H
X
X
H
X
X
H
X
X
X
H
X
X
H
X
X
H
X
X
(SelfRefresh)
Clock Suspend Mode Entry
Power Down Mode Entry
Active
Any(5)
H
H
L
L
X
X
X
X
X
X
X
X
Clock Suspend Mode Exit
Power Down Mode Exit
Active
L
L
H
H
X
X
X
X
X
X
X
X
Any
(PowerDown)
Data Write/Output Enable
Data Mask/Output Disable
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 BS signal.
4. Device state is 1, 2, 4, 8, and full page burst operation.
5. Power Down Mode can not enter in the burst operation.
When this command is asserted in the burst cycle, device state is clock suspend mode.
Etron Confidential
5
Rev. 1.1
Jan. 2002
ETRON [ ETRON TECHNOLOGY, INC. ]
