參數(shù)資料
型號(hào): W972GG8JB-25
廠商: WINBOND ELECTRONICS CORP
元件分類: DRAM
英文描述: 256M X 8 DDR DRAM, 0.4 ns, PBGA60
封裝: 11 X 11.50 MM, ROHS COMPLIANT, WBGA-60
文件頁數(shù): 25/86頁
文件大?。?/td> 1466K
代理商: W972GG8JB-25
W972GG8JB
Publication Release Date: Feb. 18, 2011
- 31 -
Revision A02
8.
OPERATION MODE
8.1
Command Truth Table
COMMAND
CKE
BA2
BA1
BA0
A14-A11
A10
A9-A0
CS
RAS
CAS
WE
NOTES
Previous
Cycle
Current
Cycle
Bank Activate
H
BA
Row Address
L
H
1,2
Single Bank
Precharge
H
BA
X
L
X
L
H
L
1,2
Precharge All
Banks
H
X
H
X
L
H
L
1
Write
H
BA
Column
L
Column
L
H
L
1,2,3
Write with Auto-
precharge
H
BA
Column
H
Column
L
H
L
1,2,3
Read
H
BA
Column
L
Column
L
H
L
H
1,2,3
Read with Auto-
precharge
H
BA
Column
H
Column
L
H
L
H
1,2,3
(Extended)
Mode Register
Set
H
BA
OP Code
L
1,2
No Operation
H
X
L
H
1
Device Deselect
H
X
H
X
1
Refresh
H
X
L
H
1
Self Refresh
Entry
H
L
X
L
H
1,4
Self Refresh Exit
L
H
X
H
X
1,4,5
L
H
Power Down
Mode Entry
H
L
X
H
X
1,6
L
H
Power Down
Mode Exit
L
H
X
H
X
1,6
L
H
Notes:
1. All DDR2 SDRAM commands are defined by states of
CS , RAS , CAS , WE and CKE at the rising edge of the clock.
2. Bank addresses BA [2:0] determine which bank is to be operated upon. For (E)MRS BA selects an (Extended) Mode Register.
3. Burst reads or writes at BL = 4 can not be terminated or interrupted. See Burst Interrupt in section 7.5 for details.
4. VREF must be maintained during Self Refresh operation.
5. Self Refresh Exit is asynchronous.
6. The Power Down does not perform any refresh operations. The duration of Power Down Mode is therefore limited by the
refresh requirements outlined in section 7.9.
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