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W9725G6KB25A Datasheet(HTML) 17 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) 17 Page - Winbond

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W9725G6KB
Publication Release Date: Sep. 03, 2012
- 17 -
Revision A03
For proper operation of adjust mode, WL = RL - 1 = AL + CL - 1 clocks and tDS/tDH should be met as
shown in Figure 7. For input data pattern for adjustment, DT0 - DT3 is a fixed order and is not affected
by burst type (i.e., sequential or interleave).
OCD adjust mode
OCD calibration mode exit
WR
WL
DQS
tDS tDH
DT0
CLK
DQS_in
CMD
DQ_in
DM
NOP
EMRS
NOP
NOP
NOP
NOP
NOP
NOP
EMRS
CLK
DT1
DT2
DT3
Figure 7
– OCD Adjust Mode
8.2.3.3
Drive Mode
Drive mode, both Drive (1) and Drive (0), is used for controllers to measure DDR2 SDRAM Driver
impedance. In this mode, all outputs are driven out tOIT
after “enter drive mode” command and all
output drivers are turned-off tOIT
after “OCD calibration mode exit” command as shown in Figure 8.
Enter Drive mode
OCD calibration mode exit
EMRS
EMRS
NOP
NOP
NOP
NOP
NOP
NOP
NOP
CLK
DQS
DQS
CMD
DQ
tOIT
tOIT
DQs high for Drive (1)
DQs low for Drive (0)
DQS high & DQS low for Drive (1), DQS low & DQS high for Drive (0)
CLK
HI-Z
Figure 8
– OCD Drive Mode


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