w942508ch Winbond Electronics Corp America, w942508ch Datasheet - Page 19

• Manufacturer Part Number: w942508ch
• Description: 8m X 4 Banks X 8 Bit Ddr Sdram
• Manufacturer: Winbond Electronics Corp America

8.3 Function Truth Table for CKE
Notes
1.
2.
Remark: H = High level, L = Low level, X = High or Low level (Don’t care), V = Valid data
Self Refresh
Power Down
All Banks Idle
Row Active
Any State
Other Than
Listed Above
CURRENT
Self refresh can enter only from the all banks idle state.
Power down can enter only from bank idle or row active state.
STATE
n-1
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
CKE
X
H
H
H
H
X
H
H
X
H
X
H
n
L
L
L
L
L
L
L
L
L
L
L
L
CS
X
H
X
X
X
X
X
H
X
X
H
X
X
L
L
L
L
L
L
L
L
L
L
L
RAS
X
X
H
H
X
X
X
X
X
X
H
H
X
X
X
H
H
X
X
L
L
L
L
L
CAS
H
H
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
L
L
L
L
WE
H
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
- 19 -
ADDRESS
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 -> Idle after t
ILLEGAL
ILLEGAL
Maintain Self Refresh
INVALID
Exit Power down -> Idle after t
Maintain power down mode
Refer to Function Truth Table
Enter Power down
Enter Power down
Self Refresh
ILLEGAL
ILLEGAL
Power down
Refer to Function Truth Table
Enter Power down
Enter Power down
ILLEGAL
ILLEGAL
ILLEGAL
Power down
Refer to Function Truth Table
Exit Self Refresh -> Idle after t
Publication Release Date: May 21, 2003
ACTION
W942508CH
IS
XSNR
XSNR
Revision A3
NOTES
2
2
1
2
2
2