EM639165 Etron Technology Inc., EM639165 Datasheet - Page 12

• Manufacturer Part Number: EM639165
• Description: 8Mega x 16bits SDRAM
• Manufacturer: Etron Technology Inc.

Preliminary
FUNCTION TRUTH TABLE for CKE
ABBREVIATIONS:
H=High Level, L=Low Level, X=Don't Care
NOTES:
1. CKE Low to High transition will re-enable CLK and other inputs asynchronously. A minimum
setup time must be satisfied before any command other than EXIT.
2. Power-Down and Self-Refresh can be entered only from the All Banks Idle State.
3. Must be legal command.
Current State
REFRESH*1
ANY STATE
listed above
ALL BANKS
other than
POWER
DOWN
IDLE*2
SELF-
CKE
n-1
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
CKE
n
X
H
H
H
H
H
X
H
H
X
H
H
L
L
L
L
L
L
L
L
L
L
/CS
X
H
X
X
X
X
X
H
X
X
X
X
X
L
L
L
L
L
L
L
L
L
/RAS /CAS
X
X
H
H
H
X
X
X
X
X
H
H
H
X
X
X
X
X
L
X
L
L
X
X
H
H
X
X
X
X
X
X
X
H
H
X
X
X
X
X
X
L
L
L
12
/WE
X
X
H
L
X
X
X
X
X
X
H
X
H
L
X
X
X
X
X
X
X
X
Add
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Action
INVALID
INVALID
Exit Self-Refresh (Idle after tRC)
Exit Self-Refresh (Idle after tRC)
ILLEGAL
ILLEGAL
ILLEGAL
NOP (Maintain Self-Refresh)
Exit Power Down to Idle
NOP (Maintain Power Down)
Enter Self-Refresh
Enter Power Down
Enter Power Down
ILLEGAL
ILLEGAL
ILLEGAL
Refer to Current State =Power Down
Begin CLK Susspend at Next Cycle*3
Maintain CLK Suspend
Exit CLK Susspend at Next Cycle*3
Refer to Function Truth Table
Refer to Function Truth Table
Rev 1.0
EM639165
Feb. 2001