VG36128401A
VG36128801A
Preliminary
VG36128161A
CMOS Synchronous Dynamic RAM
VIS
(1/3)
2.4 Operative Command Table Notes 1
Current
state
CS RAS CAS WE
Address
Command
Action
Notes
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
Nop or Power down
2
2
3
3
NOP or BST
BA, CA, A10 READ/READA ILLEGAL
BA, CA, A10 WRIT/WRITA ILLEGAL
L
H
H
L
H
L
BR, RA
ACT
Row active
L
BA, A10
PRE/PALL
REF/SELF
MPS
Nop
L
H
L
X
Refresh or Self refresh
4
L
L
Op - Code
Mode register access
Row active
X
H
H
H
L
X
H
L
X
X
H
L
X
X
DESL
Nop
Nop
NOP or BST
BA, CA, A10 READ/READA Begin read : Determine AP
BA, CA, A10 WRIT/WRITA Begin write : Determine AP
5
5
3
6
L
H
H
L
H
L
BA, RA
ACT
ILLEGAL
L
BA, A10
PRE/PALL
REF/SELF
MRS
Precharge
L
H
L
X
ILLEGAL
L
L
Op - Code
ILLEGAL
Read
X
H
H
H
H
L
X
H
H
L
X
H
L
X
X
X
DESL
Continue burst to end ® Row active
Continue burst to end ® Row active
Burst end ® Row active
NOP
BST
H
L
BA, CA, A10 READ/READA Term burst, new read : Determine AP
BA, CA, A10 WRIT/WRITA Term burst, start write : Determine AP
7
7,8
3
L
H
H
L
H
L
BA, RA
ACT
ILLEGAL
L
BA, A10
PRE/PALL
REF/SELF
MRS
Term burst, precharging
ILLEGAL
L
H
L
X
L
L
Op - Code
ILLEGAL
Write
X
H
H
H
H
L
X
H
H
L
X
H
L
X
X
X
DESL
Continue burst to end ® Write recovering
Continue burst to end ® Write recovering
Burst stop ® Row active
NOP
BST
H
L
BA, CA, A10 READ/READA Term burst, start read : determine AP
BA, CA, A10 WRIT/WRITA Term burst, new write : Determine AP
7,8
7
L
H
H
L
H
L
BA, RA
BA, A10
X
ACT
ILLEGAL
3
L
PRE/PALL
REF/SELF
MRS
Term burst, precharging
ILLEGAL
9
L
H
L
L
L
Op - Code
ILLEGAL
Document : 1G5-0154
Rev.1
Page 10
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