AD484M1644VTA-15 Ver la hoja de datos (PDF) - Unspecified
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AD484M1644VTA-15 Datasheet PDF : 20 Pages
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Ascend Semiconductor Corporation 64Mb SDRAM
4. Operative Command Table
Current
state
/CS /R /C /W Addr.
Command
Action
HXXX
X
LHH X
X
L H L H BA/CA/A10
Idle
L H L L BA/CA/A10
L L H H BA/RA
L L H L BA, A10
LL LH
X
L L L L Op-Code
HXXX
X
LHH X
X
L H L H BA/CA/A10
Row active L H L L BA/CA/A10
L L H H BA/RA
L L H L BA, A10
LL LH
X
L L L L Op-Code
HXXX
X
LHHH
X
LHH L
X
L H L H BA/CA/A10
Read
L L L L BA/CA/A10
L L H H BA/RA
L L H L BA/A10
LL LH
X
L L L L Op-Code
HXXX
X
LHHH
X
LHH L
X
L H L H BA/CA/A10
Write
L L L L BA/CA/A10
L L H H BA/RA
L L H L BA/A10
LL LH
X
L L L L Op-Code
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
WRIT/WRITA
ACT
PRE/PALL
REF/SELF
MRS
Nop or power down
Nop or power down
ILLEGAL
ILLEGAL
Row activating
Nop
Refresh or self refresh
Mode register accessing
Nop
Nop
Begin read : Determine AP
Begin write : Determine AP
ILLEGAL
Precharge
ILLEGAL
ILLEGAL
Continue burst to end → Row active
Continue burst to end → Row active
Burst stop → Row active
Terminate burst, new read : Determine AP
Terminate burst, start write : Determine AP
ILLEGAL
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 : Determine AP 7, 8
Terminate burst, new write : Determine AP 7
ILLEGAL
Terminate burst, pre-charging
ILLEGAL
ILLEGAL
Remark H = High level, L = Low level, X = High or Low level (Don't care)
Notes
2
2
3
3
4
5
5
3
6
4
7
7, 8
3
4
7,8
7
3
9
Preliminary
11
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