MB81EDS256445 Datasheet, PDF (12/52 Pages) Fujitsu Component Limited. – MEMORY Consumer FCRAM CMOS 256M Bit (4 bank x 1M word x 64 bit) Consumer Applications Specific Memory for SiP

MB81EDS256445
2) CKE Command Truth Table
Command
SELF REFRESH ENTRY *¹
Symbol
CKE
n-1 n
CS RAS CAS WE BA
A[11:0]
SELF H L L L L H X
X
SELF REFRESH EXIT *²
POWER DOWN ENTRY *¹
POWER DOWN EXIT
L HHHX
X
SELFX L H
HXXXX
X
L HHHX
X
PD
HL
HXXXX
X
L HHHX
X
PDX
LH
HXXXX
X
DEEP POWER DOWN ENTRY *¹
DPD
HL
L
HH
L
X
X
DEEP POWER DOWN EXIT
L HHHX
X
DPDX L H
HXXXX
X
Note: V = Valid, L = VIL, H = VIH, X can be either VIL or VIH
*1: SELF and DPD commands can be issued after all banks have been precharged and all DQ are in High-Z.
*2: CKE should be held High more than tREFC period after SELFX.
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DS05-11456-1E