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W9425G6EH_0812 Datasheet, PDF (22/54 Pages) Winbond – 4 M × 4 BANKS × 16 BITS DDR SDRAM | |||
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W9425G6EH
8.3 Function Truth Table for CKE
CURRENT
STATE
Self Refresh
Power Down
All banks Idle
Row Active
Any State
Other Than
Listed Above
CKE
CS RAS CAS WE
n-1 n
HXX X X X
LHH X X X
LHL H H X
LHL H L X
LHL L X X
LLX X X X
HXX X X X
LHX X X X
LLX X X X
HHX X X X
HLH X X X
HL L H H X
HL L L L H
HL L H L X
HL L L X X
LXX X X X
HHX X X X
HLH X X X
HL L H H X
HL L L L H
HL L H L X
HL L L X X
LXX X X X
HHX X X X
ADDRESS
ACTION
X
INVALID
X
Exit Self Refresh->Idle after tXSNR
X
Exit Self Refresh->Idle after tXSNR
X
ILLEGAL
X
ILLEGAL
X
Maintain Self Refresh
X
INVALID
X
Exit Power down->Idle after tIS
X
Maintain power down mode
X
Refer to Function Truth Table
X
Enter Power down
X
Enter Power down
X
Self Refresh
X
ILLEGAL
X
ILLEGAL
X
Power down
X
Refer to Function Truth Table
X
Enter Power down
X
Enter Power down
X
ILLEGAL
X
ILLEGAL
X
ILLEGAL
X
Power down
X
Refer to Function Truth Table
Notes:
1. Self refresh can enter only from the all banks idle state.
2. Power Down occurs when all banks are idle; this mode is referred to as precharge power down.
3. Power Down occurs when there is a row active in any bank; this mode is referred to as active power down.
Remark: H = High level, L = Low level, X = High or Low level (Donât care), V = Valid data
NOTES
2
2
1
3
3
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Publication Release Date:Dec. 03, 2008
Revision A08
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