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W9751G6IB
For proper operation of adjust mode, WL = RL - 1 = AL + CL - 1 clocks and t DS /t DH should be met as
shown in Figure 7. For input data pattern for adjustment, D T0 - D T3 is a fixed order and is not affected
by burst type (i.e., sequential or interleave).
CLK
CLK
CMD
EMRS(1)
NOP
NOP
NOP
NOP
NOP
NOP
EMRS
NOP
DQS_in
WL
tDS tDH
DQS
WR
DQ_in
DM
OCD adjust mode
DT0 DT1 DT2 DT3
OCD calibration mode exit
Figure 7 — OCD Adjust Mode
7.2.3.3
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 t OIT after “enter drive mode” command and all
output drivers are turned-off t OIT after “OCD calibration mode exit” command as shown in Figure 8.
Figure 8 — OCD Drive Mode
Publication Release Date: Oct. 23, 2009
- 17 -
Revision A06
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