参数资料
型号: W9725G8JB-25I
厂商: WINBOND ELECTRONICS CORP
元件分类: DRAM
英文描述: DDR DRAM, PBGA84
封装: 8 X 12.50 MM, ROHS COMPLIANT, WBGA-84
文件页数: 25/86页
文件大小: 1462K
代理商: W9725G8JB-25I
W9725G8JB
Publication Release Date: Oct. 12, 2010
- 31 -
Revision A01
8.
OPERATION MODE
8.1
Command Truth Table
COMMAND
CKE
BA1
BA0
A12
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 [1:0] 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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