EM48AM1684VTG
4. Operative Command Table (Note 7)
Current
/CS /R /C /W
Addr.
Command
Action
Nop or power down
Notes
state
H
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
X
H
H
H
L
X
H
L
X
X
H
L
X
X
DESL
8
8
9
9
NOP or BST Nop or power down
READ/READA
BA/CA/A10
ILLEGAL
Idle
L
BA/CA/A10 WRIT/WRITA ILLEGAL
ACT
H
H
L
H
L
BA/RA
Row activating
L
BA, A10
PRE/PALL Nop
L
H
L
X
REF/SELF Refresh or self refresh
10
L
L
Op-Code
MRS
Mode register accessing
Nop
X
H
H
H
L
X
H
L
X
X
H
L
X
X
DESL
NOP or BST Nop
BA/CA/A10 READ/READA Begin read : Determine AP
BA/CA/A10 WRIT/WRITA Begin write : Determine AP
11
11
9
Row
L
active
H
H
L
H
L
BA/RA
ACT
ILLEGAL
L
BA, A10
PRE/PALL Pre-charge
REF/SELF ILLEGAL
12
10
L
H
L
X
L
L
Op-Code
MRS
DESL
NOP
BST
ILLEGAL
X
H
H
H
L
X
H
H
L
X
H
L
X
X
X
Continue burst to end→ Row active
Continue burst to end→ Row active
Burst stop→ Row active
H
L
BA/CA/A10 READ/READA Terminate burst, new read : Determine AP
BA/CA/A10 WRIT/WRITA Terminate burst, start write : Determine AP
13
13,14
9
Read
L
L
H
H
L
H
L
BA/RA
ACT
ILLEGAL
L
BA/A10
PRE/PALL Terminate burst, pre-charging
REF/SELF ILLEGAL
10
L
H
L
X
L
L
Op-Code
MRS
DESL
NOP
BST
ILLEGAL
X
H
H
H
L
X
H
H
L
X
H
L
X
X
X
Continue burst to end→ Write recovering
Continue burst to end→ Write recovering
Burst stop→ Row active
H
L
BA/CA/A10 READ/READA Terminate burst, start read: Determine AP 7, 8 13,14
Write
WRIT/WRITA
ACT
L
BA/CA/A10
BA/RA
BA/A10
X
Terminate burst, new write: Determine AP 7
ILLEGAL
13
9
L
H
H
L
H
L
L
PRE/PALL Terminate burst, pre-charging
REF/SELF ILLEGAL
15
L
H
L
L
L
Op-Code
MRS
ILLEGAL
H = High level, L = Low level, X = High or Low level (Don't care)
Aug. 2011
16/20
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