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參數(shù)資料
| 型號： | μPD45D128842 |
| 廠商： | NEC Corp. |
| 英文描述： | 128 M-bit Synchronous DRAM with Double Data Rate(128 同步動態(tài)RAM) |
| 中文描述： | 128 M位同步雙數(shù)據(jù)速率（128同步動態(tài)RAM的內(nèi)存） |
| 文件頁數(shù)： | 17/80頁 |
| 文件大?。?/td> | 637K |
| 代理商： | ΜPD45D128842 |
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17
μ
PD45D128442, 45D128842, 45D128164
Preliminary Data Sheet
4.4 Operative Command Table
Note1
(1/3)
Current state
/CS /RAS /CAS /WE
Address
Command
Action
Notes
Idle
H
x
x
x
x
DESL
Nop or Power down
L
H
H
H
x
NOP
Nop or Power down
L
H
H
L
x
BST
ILLEGAL
2
L
H
L
H
BA, CA, A10 READ/READA ILLEGAL
2
L
H
L
L
BA, CA, A10 WRIT/WRITA
ILLEGAL
2
L
L
H
H
BA, RA
ACT
Bank activating
L
L
H
L
BA, A10
PRE/PALL
Nop
3
L
L
L
H
x
REF/SELF
CBR (auto) refresh or Self refresh
4
L
L
L
L
Op-Code
MRS
Mode register set
4
L
L
L
L
Op-Code
EMRS
Extended mode register set
4
Row active
H
x
x
x
x
DESL
Nop
L
H
H
H
x
NOP
Nop
L
H
H
L
x
BST
ILLEGAL
2
L
H
L
H
BA, CA, A10 READ/READA Begin read/read with AP
L
H
L
L
BA, CA, A10 WRIT/WRITA
Begin write/write with AP
L
L
H
H
BA, RA
ACT
ILLEGAL
2
L
L
H
L
BA, A10
PRE/PALL
Precharge/Precharge all banks
5
L
L
L
H
x
REF
ILLEGAL
L
L
L
L
Op-Code
MRS
ILLEGAL
L
L
L
L
Op-Code
EMRS
ILLEGAL
Read
H
x
x
x
x
DESL
Nop (Row active after burst end)
L
H
H
H
x
NOP
Nop (Row active after burst end)
L
H
H
L
x
BST
terminate burst, Row active
6
L
H
L
H
BA, CA, A10 READ/READA terminate burst, Begin new read/
read with AP
6
L
H
L
L
BA, CA, A10 WRIT/WRITA
ILLEGAL
L
L
H
H
BA, RA
ACT
ILLEGAL
2
L
L
H
L
BA, A10
PRE/PALL
terminate burst,
Precharge/Precharge all banks
6
L
L
L
H
x
REF/SELF
ILLEGAL
L
L
L
L
Op-Code
MRS
ILLEGAL
L
L
L
L
Op-Code
EMRS
ILLEGAL
Write
H
x
x
x
x
DESL
Nop (Row active after t
DPL
)
L
H
H
H
x
NOP
Nop (Row active after t
DPL
)
L
H
H
L
x
BST
ILLEGAL
L
H
L
H
BA, CA, A10 READ/READA terminate burst, Begin read/read with AP 6
L
H
L
L
BA, CA, A10 WRIT/WRITA
terminate burst, Begin new write/
write with AP
6
L
L
H
H
BA, RA
ACT
ILLEGAL
2
L
L
H
L
BA, A10
PRE/PALL
terminate burst, Precharge/Precharge all
banks
6
L
L
L
H
x
REF
ILLEGAL
L
L
L
L
Op-Code
MRS
ILLEGAL
L
L
L
L
Op-Code
EMRS
ILLEGAL
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