MB81N643289 Datasheet, PDF (6/64 Pages) Fujitsu Component Limited. – 8 x 256K x 32 BIT DOUBLE DATA RATE FCRAMTM

MB81N643289-50/-60 Preliminary (AE1E)
s FUNCTION TRUTH TABLE (continued)
DM TRUTH TABLE (Effective during Write mode)
Function
Command
Data Mask for DQ0 to DQ7
Data Mask for DQ8 to DQ15
Data Mask for DQ16 to DQ23
Data Mask for DQ24 to DQ31
MASK0
MASK1
MASK2
MASK3
PD
(n - 1)
(n)
H
X
H
X
H
X
H
X
DM0
H
X
X
X
DM1
X
H
X
X
DM2
X
X
H
X
DM3
X
X
X
H
PD TRUTH TABLE
Current
State
Function
PD
Notes Command
(n-1) (n)
Idle
Auto-refresh
*10 REF
HH
Idle
Self-refresh Entry
*10
*11
SELF
HL
Self-
refresh
Self-refresh Continue
—
LL
Self-
refresh
Self-refresh Exit
SELFX
LH
LH
HL
Idle
Power Down Entry *12 PDEN
HL
Power
Down
Power Down Continue
—
LL
Power
Down
Power Down Exit
PDEX
LH
LH
CS RAS CAS WE
LL LH
LL LH
XX XX
LHHH
HX XX
LHHH
HX XX
XX XX
LHHH
HX XX
AC BA0-2 A10-0 DQ0-31
XXX—
X X X Hi-Z
X X X Hi-Z
X X X Hi-Z
X X X Hi-Z
X X X Hi-Z
X X X Hi-Z
X X X Hi-Z
X X X Hi-Z
X X X Hi-Z
Notes:*10. The REF and SELF commands should only be issued after all banks have been precharged (PC or
PCA command). In case of SELF command, it should also be issued after the last read data have been
appeared on DQ. Refer to STATE DIAGRAM.
*11. PD must bring to Low level together with REF command.
*12. The PDEN command should only be issued after the last read data have been appeared on DQ and
after the lWPL is satisfied from last write data input.
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