W9425G8EH Datasheet, PDF (21/53 Pages) Winbond – 8M × 4 BANKS × 8 BITS DDR SDRAM

W9425G8EH
8.3 Function Truth Table for CKE
CURRENT
STATE
CKE
n-1 n
CS RAS CAS WE ADDRESS
ACTION
HX X X X X
LHH X X X
Self Refresh
LH L H H X
LH L H L X
LH L L X X
LLX X X X
HX X X X X
Power Down
LHX X
X
X
LLX X X X
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
HH X X X X
HL H X X X
HL L H H X
All banks Idle H L L L
L
H
HL L H L X
HL L L X X
LXX X X X
HH X X X X
HL H X X X
Row Active
HL L H H X
HL L L L H
HL L H L X
HL L L X X
LXX X X X
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
Any State
Other Than
HH X X X X
Listed Above
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: Jul. 04, 2008
Revision A01