1HY5DU283222BF(P)
CKE FUNCTION TRUTH TABLE
Current
State
CKEn-
1
CKEn
/CS
/RAS
/CAS
/WE
/ADD
Action
H
L
X
H
H
H
H
H
L
X
H
L
X
X
H
H
H
L
X
X
H
H
L
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
INVALID
Exit self refresh, enter idle after tSREX
Exit self refresh, enter idle after tSREX
ILLEGAL
L
SELF
REFRESH1
L
L
L
L
X
X
X
X
X
H
L
ILLEGAL
L
L
X
X
X
X
H
H
L
ILLEGAL
L
X
X
H
L
X
X
X
H
H
H
L
NOP, continue self refresh
INVALID
H
L
X
H
H
H
H
H
L
Exit power down, enter idle
Exit power down, enter idle
ILLEGAL
L
POWER
DOWN2
L
L
L
L
X
X
X
X
H
X
H
L
ILLEGAL
L
L
X
X
X
L
ILLEGAL
L
X
X
L
X
X
L
NOP, continue power down mode
See operation command truth table
Enter self refresh
Exit power down
Exit power down
ILLEGAL
H
H
H
H
H
H
H
H
L
H
L
L
H
L
X
H
H
H
L
X
H
H
L
L
ALL BANKS
IDLE4
L
L
L
L
X
X
L
ILLEGAL
L
L
H
L
ILLEGAL
L
L
L
ILLEGAL
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
NOP
H
H
L
H
L
See operation command truth table
ANY STATE
OTHER
THAN
ILLEGAL5
INVALID
INVALID
H
L
ABOVE
L
Note :
When CKE=L, all DQ and DQS(0~3) must be in Hi-Z state.
1. CKE and /CS must be kept high for a minimum of 200 stable input clocks before issuing any command.
2. All command can be stored after 2 clocks from low to high transition of CKE.
3. Illegal if CK is suspended or stopped during the power down mode.
4. Self refresh can be entered only from the all banks idle state.
5. Disabling CK may cause malfunction of any bank which is in active state.
Rev. 1.2 / Jul. 2005
13
HYNIX [ HYNIX SEMICONDUCTOR ]
