MB81P643287 Datasheet, PDF (14/65 Pages) Fujitsu Component Limited. – 8 x 256K x 32 BIT, FCRAMTM CORE BASED DOUBLE DATA RATE SDRAM

MB81P643287-50/-60
COMMAND TRUTH TABLE FOR CKE
Current
State
CKE CKE
(n-1) (n)
CS
RAS CAS
WE Address
Function
Notes
H
X
X
X
X
X
X Invalid
L
H
H
X
X
X
Exit Self-refresh
X (Self-refresh Recovery →
Idle after tPDEX + lSCD or lXSNR)
Self-
refresh
L
H
L
H
H
H
Exit Self-refresh
X (Self-refresh Recovery →
Idle after tPDEX + lSCD or lXSNR)
L
H
L
H
H
L
X Illegal
L
H
L
H
L
X
X Illegal
L
H
L
L
X
X
X Illegal
L
L
X
X
X
X
X NOP (Maintain Self-refresh)
L
X
X
X
X
X
X Invalid
H
H
H
X
X
X
X
Idle after lSCD or lXSNR
Self-
refresh
Recovery
H
H
L
H
H
H
H
H
L
H
H
L
H
H
L
H
L
X
X
Idle after lSCD or lXSNR
X Illegal
X Illegal
H
H
L
L
X
X
X Illegal
H
L
X
X
X
X
X Illegal
H
X
X
X
X
X
X Invalid
L
H
H
X
X
X
X
Power Down Exit → Return to original
state after tPDEX
Power
Down
L
H
L
H
H
H
L
H
L
H
H
L
X
Power Down Exit → Return to original
state after tPDEX
X Illegal
L
H
L
H
L
X
X Illegal
L
H
L
L
X
X
X Illegal
L
L
X
X
X
X
X NOP (Maintain Power Down Mode)
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