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eorex
EM48AM3284LBA
Jul. 2006
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4. Operative Command Table
(Note 7)
Current
State
/CS
/R
/C
/W
Addr.
Command
Action
H
X
X
X
X
DESL
Nop or power down
(Note 8)
L
H
H
X
X
NOP or BST
Nop or power down
(Note 8)
L
H
L
H
BA/CA/A10
READ/READA
ILLEGAL
(Note 9)
L
H
L
L
BA/CA/A10
WRIT/WRITA
ILLEGAL
(Note 9)
L
L
H
H
BA/RA
ACT
Row activating
L
L
H
L
BA, A10
PRE/PALL
Nop
L
L
L
H
X
REF/SELF
Refresh or self refresh
(Note 10)
Idle
L
L
L
L
Op-Code
MRS
Mode register accessing
H
X
X
X
X
DESL
Nop
L
H
H
X
X
NOP or BST
Nop
L
H
L
H
BA/CA/A10
READ/READA
Begin read: Determine AP
(Note 11)
L
H
L
L
BA/CA/A10
WRIT/WRITA
Begin write: Determine AP
(Note 11)
L
L
H
H
BA/RA
ACT
ILLEGAL
(Note 9)
L
L
H
L
BA, A10
PRE/PALL
Pre-charge
(Note 12)
L
L
L
H
X
REF/SELF
ILLEGAL
(Note 10)
Row
Active
L
L
L
L
Op-Code
MRS
ILLEGAL
H
X
X
X
X
DESL
Continue burst to end
→ Row active
L
H
H
H
X
NOP
Continue burst to end
→ Row active
L
H
H
L
X
BST
Burst stop
→ Row active
L
H
L
H
BA/CA/A10
READ/READA
Terminate burst, new read:
Determine AP
(Note 13)
L
L
L
L
BA/CA/A10
WRIT/WRITA
Terminate burst, start write:
Determine AP
(Note 13, 14)
L
L
H
H
BA/RA
ACT
ILLEGAL
(Note 9)
L
L
H
L
BA, A10
PRE/PALL
Terminate burst, pre-charging
(Note 10)
L
L
L
H
X
REF/SELF
ILLEGAL
Read
L
L
L
L
Op-Code
MRS
ILLEGAL
H
X
X
X
X
DESL
Continue burst to end
→ Write
recovering
L
H
H
H
X
NOP
Continue burst to end
→ Write
recovering
L
H
H
L
X
BST
Burst stop
→ Row active
L
H
L
H
BA/CA/A10
READ/READA
Terminate burst, start read:
Determine AP 7, 8
(Note 13, 14)
L
L
L
L
BA/CA/A10
WRIT/WRITA
Terminate burst, new write:
Determine AP 7
(Note 13)
L
L
H
H
BA/RA
ACT
ILLEGAL
(Note 9)
L
L
H
L
BA, A10
PRE/PALL
Terminate burst, pre-charging
(Note 15)
L
L
L
H
X
REF/SELF
ILLEGAL
Write
L
L
L
L
Op-Code
MRS
ILLEGAL
Remark H = High level, L = Low level, X = High or Low level (Don't care)
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