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參數(shù)資料
| 型號(hào)： | μPD45128441 |
| 廠(chǎng)商： | NEC Corp. |
| 英文描述： | 128M-bit Synchronous DRAM(128M 同步DRAM) |
| 中文描述： | 128兆位同步DRAM（128M的同步DRAM）的 |
| 文件頁(yè)數(shù)： | 19/84頁(yè) |
| 文件大?。?/td> | 693K |
| 代理商： | ΜPD45128441 |
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Preliminary Data Sheet
19
μ
PD45128441, 45128841, 45128163
4.5 Command Truth Table for CKE
Current State
CKE
/CS /RAS /CAS /WE
Address
Action
Notes
n – 1
n
Self refresh
H
×
×
×
×
×
×
INVALID, CLK (n – 1) would exit self refresh
L
H
H
×
×
×
×
Self refresh recovery
L
H
L
H
H
×
×
Self refresh recovery
L
H
L
H
L
×
×
ILLEGAL
L
H
L
L
×
×
×
ILLEGAL
L
L
×
×
×
×
×
Maintain self refresh
Self refresh recovery
H
H
H
×
×
×
×
Idle after t
RC
H
H
L
H
H
×
×
Idle after t
RC
H
H
L
H
L
×
×
ILLEGAL
H
H
L
L
×
×
×
ILLEGAL
H
L
H
×
×
×
×
ILLEGAL
H
L
L
H
H
×
×
ILLEGAL
H
L
L
H
L
×
×
ILLEGAL
H
L
L
L
×
×
×
ILLEGAL
Power down
H
×
×
×
×
×
INVALID, CLK (n – 1) would exit power down
L
H
×
×
×
×
×
EXIT power down
→
Idle
L
L
×
×
×
×
×
Maintain power down mode
Both banks idle
H
H
H
×
×
×
Refer to operations in Operative Command Table
H
H
L
H
×
×
Refer to operations in Operative Command Table
H
H
L
L
H
×
Refer to operations in Operative Command Table
H
H
L
L
L
H
×
Refresh
H
H
L
L
L
L
Op-Code
Refer to operations in Operative Command Table
H
L
H
×
×
×
Refer to operations in Operative Command Table
H
L
L
H
×
×
Refer to operations in Operative Command Table
H
L
L
L
H
×
Refer to operations in Operative Command Table
H
L
L
L
L
H
×
Self refresh
1
H
L
L
L
L
L
Op-Code
Refer to operations in Operative Command Table
L
×
×
×
×
×
×
Power down
1
Row active
H
×
×
×
×
×
×
Refer to operations in Operative Command Table
L
×
×
×
×
×
×
Power down
1
Any state other than
H
H
×
×
×
×
Refer to operations in Operative Command Table
listed above
H
L
×
×
×
×
×
Begin clock suspend next cycle
2
L
H
×
×
×
×
×
Exit clock suspend next cycle
L
L
×
×
×
×
×
Maintain clock suspend
Notes 1.
Self refresh can be entered only from the both banks idle state. Power down can be entered only from
both banks idle or row active state.
2.
Must be legal command as defined in Operative Command Table.
Remark
H = High level, L = Low level,
×
= High or Low level (Don't care)
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