EM428M1644RTA Datasheet, PDF (14/20 Pages) Eorex Corporation – 128Mb (2M×4Bank×16) Double DATA RATE SDRAM

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EM428M1644RTA
3. Operative Command Table (Continued)
Current State /CS /R /C /W Addr.
Command
Action
H XX X
X
L HH H
X
L HH L
X
L H L H BA/CA/A10
DESL
NOP
TERM
READ
NOP
NOP
NOP
ILLEGAL^{(Note 1)}
Write
Recovering
L H L L BA/CA/A10 WRIT/WRITA New write, Determine AP
L L H H BA/RA
ACT
ILLEGAL ^{(Note 1)}
L LHL
BA/A10
PRE/PREA ILLEGAL ^{(Note 1)}
Refreshing
L LLH
X
REFA
ILLEGAL
L
L
L
L
Op-Code,
Mode-Add
MRS
ILLEGAL
H XX X
X
L HH H
X
L HH L
X
DESL
NOP
TERM
NOP(idle after t_RP)
NOP(idle after t_RP)
NOP
L H L X BA/CA/A10 READ/WRIT ILLEGAL
L L H H BA/RA
ACT
ILLEGAL
L LHL
L LLH
BA/A10
X
PRE/PREA NOP(idle after t_RP)
REFA
ILLEGAL
L
L
L
L
Op-Code,
Mode-Add
MRS
ILLEGAL
Remark 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.
Apr. 2007
14/20
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