MB81F643242B-10FN-X Datasheet, PDF (6/56 Pages) Fujitsu Component Limited. – MEMORY CMOS 4 X 512 K X 32 BIT SYNCHRONOUS DYNAMIC RAM

MB81F643242B-10FN-X Advanced Info (AE0.3E)
DQM TRUTH TABLE
Function
Data Write/Output Enable
Data Mask/Output Disable
Symbol
ENBi
MASKi
CKE
n-1
n
H
X
H
X
DQMi
L
H
Notes: *1. i = 0, 1, 2, 3
*2. DQM0 for DQ0 to DQ7, DQM1 for DQ8 to DQ15, DQM2 for DQ16 to DQ23, DQM3 for DQ24 to DQ31,
CKE TRUTH TABLE
Current
State
Function
CKE
Notes Symbol
n-1 n
CS
RAS
CAS
WE
A12,
A11
(BA)
A10
(AP)
A9
to
A0
Bank Active Clock Suspend Mode Entry *1 CSUS H L X X X X X X X
Any
(Except Idle)
Clock Suspend Continue
*1
LLX X X X X X X
Clock
Suspend
Clock Suspend Mode Exit
LHX X X X X X X
Idle
Auto-refresh Command
*2 REF H H L L L H X X X
Idle
Self-refresh Entry
*2, *3 SELF H L L L L H X X X
Self Refresh Self-refresh Exit
LHL H H H X X X
SELFX
LHH X X X X X X
Idle
Power Down Entry
HL L H H H X X X
*3 PD
HLH X X X X X X
Power
Down
Power Down Exit
LHL H H H X X X
LHH X X X X X X
Notes: *1.
*2.
*3.
The CSUS command requires that at least one bank is active. Refer to STATE DIAGRAM.
NOP or DSEL commands should only be issued after CSUS and PRE(or PALL) commands asserted
at the same time.
REF and SELF commands should only be issued after all banks have been precharged (PRE or PALL
command). Refer to STATE DIAGRAM.
SELF and PD commands should only be issued after the last read data have been appeared on DQ.
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