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參數(shù)資料
| 型號(hào)： | μPD45256841 |
| 廠商： | NEC Corp. |
| 英文描述： | 256M-Bit Synchronous DRAM(256M 同步 動(dòng)態(tài)RAM) |
| 中文描述： | 256M位同步DRAM（256M同步動(dòng)態(tài)RAM）的 |
| 文件頁數(shù)： | 19/84頁 |
| 文件大?。?/td> | 1052K |
| 代理商： | ΜPD45256841 |
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19
μ
PD45256441,45256841,45256163
Preliminary Data Sheet
4.5 Command Truth Table for CKE
Current state
CKE
/CS /RAS /CAS /WE
Address
Action
Notes
n
–1
n
Self refresh
H
x
x
x
x
x
x
INVALID, CLK(n
–1
) would exit S.R.
(S.R.)
L
H
H
x
x
x
x
S.R. Recovery
L
H
L
H
H
x
x
S.R. Recovery
L
H
L
H
L
x
x
ILLEGAL
L
H
L
L
x
x
x
ILLEGAL
L
L
x
x
x
x
x
Maintain S.R.
Self refresh
H
H
H
x
x
x
x
Idle after t
RC
recovery
H
H
L
H
H
x
x
Idle after t
RC
H
H
L
H
L
x
x
ILLEGAL
H
H
L
L
x
x
x
ILLEGAL
H
L
H
x
x
x
x
ILLEGAL
H
L
L
H
H
x
x
ILLEGAL
H
L
L
H
L
x
x
ILLEGAL
H
L
L
L
x
x
x
ILLEGAL
INVALID, CLK(n
–1
) would exit P.D.
Power down
H
x
x
x
x
x
(P.D.)
L
H
x
x
x
x
x
EXIT P.D.
→
Idle
L
L
x
x
x
x
x
Maintain power down mode
Both banks
H
H
H
x
x
x
Refer to operations in Operative Command Table
idle
H
H
L
H
x
x
Refer to operations in Operative Command Table
H
H
L
L
H
x
Refer to operations in Operative Command Table
H
H
L
L
L
H
x
Refresh
H
H
L
L
L
L
Op-Code
Refer to operations in Operative Command Table
H
L
H
x
x
x
Refer to operations in Operative Command Table
H
L
L
H
x
x
Refer to operations in Operative Command Table
H
L
L
L
H
x
Refer to operations in Operative Command Table
H
L
L
L
L
H
x
Self refresh
1
H
L
L
L
L
L
Op-Code
Refer to operations in Operative Command Table
L
x
x
x
x
x
x
Power down
1
Row Active
H
x
x
x
x
x
x
Refer to operations in Operative Command Table
L
x
x
x
x
x
x
Power down
1
Any state other
H
H
x
x
x
x
Refer to operations in Operative Command Table
than listed
H
L
x
x
x
x
x
Begin clock suspend next cycle
2
above
L
H
x
x
x
x
x
Exit clock suspend next cycle
L
L
x
x
x
x
x
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, x = High or Low level (Don’ t care)
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