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W9725G6KB25A Datasheet(HTML) 12 Page - Winbond

Part No. W9725G6KB25A
Description  DLL aligns DQ and DQS transitions with clock, Data masks (DM) for write data, Write Data Mask
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Maker  WINBOND [Winbond]
Homepage  http://www.winbond.com
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W9725G6KB25A Datasheet(HTML) 12 Page - Winbond

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W9725G6KB
Publication Release Date: Sep. 03, 2012
- 12 -
Revision A03
8.2.2.2
DLL Enable/Disable
The DLL must be enabled for normal operation. DLL enable is required during power-up initialization,
and upon returning to normal operation after having the DLL disabled. The DLL is automatically
disabled when entering Self Refresh operation and is automatically re-enabled and reset upon exit of
Self Refresh operation. Any time the DLL is enabled (and subsequently reset), 200 clock cycles must
occur before a Read command can be issued to allow time for the internal clock to be synchronized
with the external clock. Failing to wait for synchronization to occur may result in a violation of the tAC
or tDQSCK parameters.
BA1
BA0
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
0
1
OCD program
BT
Rtt
Address Field
Extended Mode Register (1)
BA1
BA0
MRS mode
0
0
0
0
1
1
1
1
MR
EMR (1)
EMR (2)
EMR (3)
A6
A2
0
0
0
0
1
1
1
1
WR
Additive Latency
Qoff
0*
1
DQS
Rtt
D.I.C DLL
Rtt (nominal)
ODT Disabled
75 ohm
150 ohm
50 ohm*
2
0
A0
1
DLL Enable
Enable
Disable
OCD Calibration Program
OCD calibration mode exit; matain setting
Adjust mode*
3
OCD Calibration default*
4
Drive (1)
Drive (0)
A9
A8
A7
1
0
0
0
1
1
1
1
1
0
0
0
0
0
0
Driver impedance adjustment
A12
1
0
Output buffer enabled
Qoff (Optional)*
5
Output buffer disabled
A10
1
0
DQS
Enable
Disable
A10
(DQS Enable)
0 (Enable)
1 (Disable)
Strobe Function Matrix
DQS
DQS
DQS
DQS
DQS
Hi-z
Output driver
impedance control
Reduced
Normal
A1
0
1
A5
0
0
0
0
1
1
1
1
A4
0
0
1
1
0
0
1
1
A3
0
1
0
1
0
1
1
0
Latency
0
3
4
Reserved
1
2
Output Driver Impedance Control
Driver
size
100%
60%
Additive Latency
5
6
Notes:
1. A11 default is
“0” RDQS disabled.
2. Optional for DDR2-667, mandatory for DDR2-800 and DDR2-1066.
3. When Adjust mode is issued, AL from previously set value must be applied.
4. After setting to default, OCD calibration mode needs to be exited by setting A9-A7 to 000. Refer to the section 8.2.3 for
detailed information.
5. Output disabled - DQs, LDQS, LDQS , UDQS, UDQS . This feature is used in conjunction with DIMM IDD measurements
when IDDQ is not desired to be included.
Figure 3
– EMR (1)


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