EM44DM1688LBB
3. Operative Command Table (Continued)
Current
State
Command
/CS /R /C /W
Addr.
X
Action
NOP (enter bank active
after tWR)
DESL
H
X
X
X
NOP (enter bank active
after tWR)
NOP
L
L
H
H
H
L
H
H
X
READ
BA/CA/A10
ILLEGAL (Note 1)
WRIT/WRITA
ACT
L
L
L
L
H
L
L
L
L
H
H
L
L
H
L
BA/CA/A10
BA/RA
BA/A10
X
New write, Determine AP
ILLEGAL (Note 1)
Write
Recovering
PRE/PREA
REF/SELF
ILLEGAL (Note 1)
H
ILLEGAL (Note 1)
Op-Code,
Mode-Add
MRS/EMRS(1)(2)
L
L
L
L
ILLEGAL (Note 1)
DESL
NOP
H
L
L
L
L
L
L
X
H
H
H
L
X
H
L
X
H
H
L
X
X
NOP(idle after tRFC)
NOP(idle after tRFC)
ILLEGAL (Note 1)
ILLEGAL (Note 1)
ILLEGAL (Note 1)
ILLEGAL (Note 1)
ILLEGAL (Note 1)
READ/READA
WRIT/WRITA
ACT
BA/CA/A10
BA/CA/A10
BA/RA
BA/A10
X
L
Refreshing
H
H
L
H
L
PRE/PREA
REF/SELF
L
L
H
Op-Code,
Mode-Add
MRS/EMRS(1)(2)
L
L
L
L
ILLEGAL (Note 1)
H = High level, L = Low level, X = High or Low level (Don't care), AP = Auto Pre-charge
Note 1: ILLEGAL to bank in specified states;
Function may be legal in the bank indicated by Bank Address (BA), depending on the state of that bank.
Note 2: Must satisfy bus contention, bus turn around, and/or write recovery requirements.
Note 3: NOP to bank precharging or in idle state.May precharge bank indicated by BA.
Note 4: ILLEGAL of any bank is not idle.
Nov. 2011
19/29
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