EtronTech
EM637327
1Mega x 32 SGRAM
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(7) BS A8 A
CS# RAS# CAS# WE# DSF
DDR
Idle(3)
Idle(3)
Any
H
H
H
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
X
X
X
H
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
V
V
V
X
V
V
V
V
V
V
V
X
X
X
X
X
X
X
V
V
L
V
L
L
L
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
H
L
H
H
L
L
H
L
BankActivate & Masked Write Disable
BankActivate & Masked Write Enable
BankPrecharge
V
X
L
PrechargeAll
Any
H
L
X
L
L
L
Active(3)
Active(3)
Active(3)
Active(3)
Active(3)
Active(3)
Idle
V
H
H
H
H
H
H
L
L
L
Write
Block Write Command
Write and AutoPrecharge
Block Write and AutoPrecharge
Read
L
V
L
L
H
L
H
H
L
V
L
L
V
L
L
H
L
V
L
H
H
L
Read and Autoprecharge
Mode Register Set
Special Mode Register Set
No-Operation
H
L
V
L
L
V
L
L
Idle(5)
X
X
X
X
X
X
X
V
L
L
L
H
X
L
Any
X
H
H
X
L
H
H
X
L
H
L
Active(4)
Any
X
Burst Stop
Device Deselect
X
X
H
H
X
H
X
X
H
X
X
H
X
X
X
L
AutoRefresh
Idle
X
SelfRefresh Entry
SelfRefresh Exit
Idle
X
L
L
L
Idle
H
X
X
H
X
X
H
X
X
H
X
X
X
H
X
X
H
X
X
H
X
X
X
X
X
X
L
(SelfRefresh)
Clock Suspend Mode Entry
Power Down Mode Entry
Active
Any(6)
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
X
X
L
Any
(PowerDown)
Data Write/Output Enable
Data Mask/Output Disable
Active
Active
H
H
X
X
L
X
X
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. The Special Mode Register Set is also available in Row Active State.
6. 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.
7. DQM0-3
Preliminary
August 1999
5
ETRON [ ETRON TECHNOLOGY, INC. ]
