eorex
EM42BM1684RTA
3. Operative Command Table (Continued)
Current State /CS /R /C /W
Addr.
Command
Action
H
L
L
L
X
H
H
H
X
H
H
L
X
H
L
X
DESL
NOP
NOP
NOP
NOP
X
X
TERM
READ
(Note 1)
H
BA/CA/A10
ILLEGAL
L
L
H
L
L
L
BA/CA/A10 WRIT/WRITA New write, Determine AP
(Note 1)
ILLEGAL
Write
Recovering
H
H
BA/RA
ACT
(Note 1)
L
L
L
L
H
L
L
BA/A10
PRE/PREA
REFA
ILLEGAL
ILLEGAL
H
X
Op-Code,
Mode-Add
L
L
L
L
MRS
ILLEGAL
H
L
L
L
L
L
L
X
H
H
H
L
X
H
H
L
X
H
L
X
X
X
DESL
NOP
NOP(idle after tRP)
NOP(idle after tRP)
NOP
TERM
X
H
L
BA/CA/A10 READ/WRIT ILLEGAL
Refreshing
H
H
L
BA/RA
BA/A10
X
ACT
PRE/PREA
REFA
ILLEGAL
NOP(idle after tRP)
ILLEGAL
L
L
H
Op-Code,
Mode-Add
L
L
L
L
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.
Jul. 2006
www.eorex.com
13/19
EOREX [ EOREX CORPORATION ]
