eorex
4. Operative Command Table
(Note 7)
Current
State
/CS
H
L
L
Idle
L
L
L
L
L
H
L
L
Row
Active
L
L
L
L
L
H
L
L
L
Read
L
L
L
L
L
H
L
L
L
Write
L
L
L
L
L
L
L
L
L
L
L
H
H
L
L
L
H
L
H
L
BA/CA/A10
BA/RA
BA, A10
X
Op-Code
WRIT/WRITA
ACT
PRE/PALL
REF/SELF
MRS
EM488M1644VTB
/R
X
H
H
H
L
L
L
L
X
H
H
H
L
L
L
L
X
H
H
H
L
L
L
L
L
X
H
H
H
/C
X
H
L
L
H
H
L
L
X
H
L
L
H
H
L
L
X
H
H
L
L
H
H
L
L
X
H
H
L
/W
X
X
H
L
H
L
H
L
X
X
H
L
H
L
H
L
X
H
L
H
L
H
L
H
L
X
H
L
H
Addr.
X
X
BA/CA/A10
BA/CA/A10
BA/RA
BA, A10
X
Op-Code
X
X
BA/CA/A10
BA/CA/A10
BA/RA
BA, A10
X
Op-Code
X
X
X
BA/CA/A10
BA/CA/A10
BA/RA
BA, A10
X
Op-Code
X
X
X
BA/CA/A10
Command
DESL
NOP or BST
READ/READA
WRIT/WRITA
ACT
PRE/PALL
REF/SELF
MRS
DESL
NOP or BST
READ/READA
WRIT/WRITA
ACT
PRE/PALL
REF/SELF
MRS
DESL
NOP
BST
READ/READA
WRIT/WRITA
ACT
PRE/PALL
REF/SELF
MRS
DESL
NOP
BST
READ/READA
Action
Nop or power down
Nop or power down
ILLEGAL
(Note 9)
(Note 9)
(Note 8)
(Note 8)
ILLEGAL
Row activating
Nop
Refresh or self refresh
(Note 10)
Mode register accessing
Nop
Nop
(Note 11)
Begin read: Determine AP
Begin write: Determine AP
ILLEGAL
(Note 9)
(Note 12)
(Note 11)
Pre-charge
ILLEGAL
ILLEGAL
Continue burst to end
→
Row active
Continue burst to end
→
Row active
Burst stop
→
Row active
Terminate burst, new read:
(Note 13)
Determine AP
Terminate burst, start write:
Determine AP
(Note 9)
ILLEGAL
(Note 10)
(Note 13, 14)
(Note 10)
Terminate burst, pre-charging
ILLEGAL
ILLEGAL
Continue burst to end
→
Write
recovering
Continue burst to end
→
Write
recovering
Burst stop
→
Row active
Terminate burst, start read:
(Note 13, 14)
Determine AP 7, 8
Terminate burst, new write:
Determine AP 7
(Note 9)
ILLEGAL
(Note 15)
(Note 13)
Terminate burst, pre-charging
ILLEGAL
ILLEGAL
Remark
H = High level, L = Low level, X = High or Low level (Don't care)
Dec. 2006
13/17
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