EtronTech
EM636165
1M x 16 SDRAM
Operation Mode
Fully synchronous operations are performed to latch the commands at the positive edges of CLK.
Table 2 shows the truth table for the operation commands.
Table 2. Truth Table (Note (1), (2) )
Command
State CKEn-1 CKEn DQM(6) A11 A
CS# RAS# CAS# WE#
10 0-9
A
Idle(3)
Any
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
H
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
V
V
X
V
V
V
V
V
X
X
X
X
X
X
V
V
X
X
V
V
V
V
V
X
X
X
X
X
X
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
Any
L
L
Active(3)
Active(3)
Active(3)
Active(3)
Idle
H
H
H
H
L
L
Write
Write and AutoPrecharge
Read
H
L
L
L
L
H
H
L
Read and Autoprecharge
Mode Register Set
No-Operation
H
V
X
X
X
X
X
X
L
L
Any
Active(4)
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 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.
6. LDQM and UDQM
Preliminary
6
Rev. 2.7 Mar. 2006
ETRON [ ETRON TECHNOLOGY, INC. ]
