eorex
EM48AM1684VBA
4. Operative Command Table (Note 7)
Current
State
/CS /R /C /W
Addr.
Command
Action
Nop or power down (Note 8)
Nop or power down (Note 8)
ILLEGAL (Note 9)
ILLEGAL (Note 9)
Row activating
Nop
H
L
L
L
X
H
H
H
X
H
L
X
X
H
L
X
X
DESL
NOP or BST
BA/CA/A10 READ/READA
BA/CA/A10 WRIT/WRITA
L
Idle
L
L
L
L
H
H
H
L
BA/RA
BA, A10
ACT
PRE/PALL
Refresh or self refresh
(Note 10)
L
L
L
H
X
REF/SELF
L
H
L
L
X
H
L
X
H
L
X
X
Op-Code
MRS
DESL
NOP or BST
Mode register accessing
Nop
Nop
Begin read: Determine AP (Note 11)
Begin write: Determine AP (Note 11)
ILLEGAL (Note 9)
X
X
L
L
L
L
L
H
H
L
L
L
H
L
BA/CA/A10 READ/READA
BA/CA/A10 WRIT/WRITA
Row
Active
H
H
L
H
L
BA/RA
BA, A10
X
ACT
Pre-charge (Note 12)
ILLEGAL (Note 10)
L
PRE/PALL
REF/SELF
L
H
L
H
L
L
X
H
H
L
X
H
H
L
X
H
L
Op-Code
MRS
DESL
NOP
BST
ILLEGAL
X
X
X
Continue burst to end → Row active
Continue burst to end → Row active
Burst stop → Row active
L
Terminate burst, new read:
Determine AP (Note 13)
Terminate burst, start write:
Determine AP (Note 13, 14)
ILLEGAL (Note 9)
L
H
L
H
BA/CA/A10 READ/READA
BA/CA/A10 WRIT/WRITA
L
L
L
L
L
L
L
H
H
L
H
L
Read
BA/RA
ACT
Terminate burst, pre-charging
(Note 10)
BA, A10
PRE/PALL
L
L
L
L
L
L
H
L
X
REF/SELF
MRS
ILLEGAL
ILLEGAL
Op-Code
Continue burst to end → Write
recovering
H
X
X
X
X
DESL
Continue burst to end → Write
recovering
Burst stop → Row active
L
L
H
H
H
H
H
L
X
X
NOP
BST
Terminate burst, start read:
Determine AP 7, 8 (Note 13, 14)
Terminate burst, new write:
Determine AP 7 (Note 13)
ILLEGAL (Note 9)
L
H
L
H
BA/CA/A10 READ/READA
BA/CA/A10 WRIT/WRITA
Write
L
L
L
L
L
L
L
H
H
L
H
L
BA/RA
ACT
Terminate burst, pre-charging
(Note 15)
BA, A10
PRE/PALL
L
L
L
L
L
L
H
L
X
REF/SELF
MRS
ILLEGAL
ILLEGAL
Op-Code
Remark H = High level, L = Low level, X = High or Low level (Don't care)
Jul. 2006
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