W9412G6JH Datasheet, PDF (21/53 Pages) Winbond – 2M  4 BANKS  16 BITS DDR SDRAM

W9412G6JH
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 (Don’t Care), V = Valid data
NOTES
2
2
1
3
3
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Publication Release Date: Nov. 29, 2011
Revision A03