MB81P643287 Datasheet, PDF (7/65 Pages) Fujitsu Component Limited. – 8 x 256K x 32 BIT, FCRAMTM CORE BASED DOUBLE DATA RATE SDRAM

MB81P643287-50/-60
DM TRUTH TABLE (Effective during Write mode)
Function
Command
CKE
(n - 1)
(n)
Data Mask for DQ0 to DQ7
MASK0
H
X
Data Mask for DQ8 to DQ15 MASK1
H
X
Data Mask for DQ16 to DQ23 MASK2
H
X
Data Mask for DQ24 to DQ31 MASK3
H
X
DM0
H
X
X
X
DM1
X
H
X
X
DM2
X
X
H
X
DM3
X
X
X
H
CKE TRUTH TABLE
Current
State
Function
CKE
BA0
Notes Command
CS RAS CAS WE AP to
(n-1) (n)
BA2
Idle
Auto-refresh
*11 REF
HHL L L H X X
Idle
Self-refresh Entry
*11
*12
SELF
HLL L L H X X
Self-
refresh
Self-refresh Continue
—
LLX X X X X X
Self-
refresh
Self-refresh Exit
LHL H H H X X
SELFX
L HH X X X X X
HLL H H H X X
Idle
Power Down Entry *13 PDEN
HLH X X X X X
Power
Down
Power Down Continue
—
LLX X X X X X
Power
Down
Power Down Exit
PDEX
LHL H H H X X
L HH X X X X X
A0 _DQ0
to to
A10 ^DQ31
X—
X Hi-Z
X Hi-Z
X Hi-Z
X Hi-Z
X Hi-Z
X Hi-Z
X Hi-Z
X Hi-Z
X Hi-Z
*11: The REF and SELF commands should only be issued after all banks have been precharged (PRE or PALL
command). In case of SELF command, it should also be issued after the last read data have been appeared
on DQ. Refer to “s STATE DIAGRAM”.
*12: CKE must bring to Low level together with REF command.
*13: The PDEN command should only be issued after the last read data have been appeared on DQ and after the
lDPL is satisfied from last write data input.
7