EM488M1644VTB
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4. Operative Command Table
Current /CS /R /C /W
Addr.
Command
Action
Notes
state
Idle
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
Nop or power down
2
2
3
3
NOP or BST Nop or power down
READ/READA
ILLEGAL
BA/CA/A10
L
BA/CA/A10 WRIT/WRITA ILLEGAL
ACT
Row activating
H
H
L
H
L
BA/RA
L
BA, A10
PRE/PALL Nop
L
H
L
X
REF/SELF Refresh or self refresh
4
L
L
Op-Code
MRS
Mode register accessing
Nop
X
H
H
H
L
X
H
L
X
X
H
L
X
X
DESL
Row
NOP or BST Nop
active
BA/CA/A10 READ/READA Begin read : Determine AP
BA/CA/A10 WRIT/WRITA Begin write : Determine AP
5
5
3
6
4
L
H
H
L
H
L
BA/RA
ACT
ILLEGAL
L
BA, A10
PRE/PALL Pre-charge
REF/SELF ILLEGAL
L
H
L
X
L
L
Op-Code
MRS
DESL
NOP
BST
ILLEGAL
Read
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
7
7.8
3
L
L
H
H
L
H
L
BA/RA
ACT
ILLEGAL
L
BA/A10
PRE/PALL Terminate burst, pre-charging
REF/SELF ILLEGAL
4
L
H
L
X
L
L
Op-Code
MRS
DESL
NOP
BST
ILLEGAL
Write
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: DetermineAP 7, 8
WRIT/WRITA
7.8
7
L
BA/CA/A10
BA/RA
BA/A10
X
Terminate burst, new write: DetermineAP 7
ILLEGAL
L
H
H
L
H
L
ACT
3
L
PRE/PALL Terminate burst, pre-charging
REF/SELF ILLEGAL
9
L
H
L
L
L
Op-Code
MRS
ILLEGAL
Remark H = High level, L = Low level, X = High or Low level (Don't care)
13
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