Quick Start Guide
Rev. A | Page 3 of 8
Figure 6
Next, in the lower portion of the screen, select “1: Single Tone” as the Data Vector. The other options can be left at their default.
Figure 5
After the DPG2 is correctly setup, click the Download button (
) in the lower right, then the Play button (
) to begin vector playback
into the AD9739.
Enable LVDS Controller
Once the pattern is loaded into the DPG2 and running, the final step is to enable the LVDS Controller. In the AD9739 SPI application,
enable the
RCV_LOOP
and
RCV_ENA
buttons. Click the Run button (
). Once the run is complete, the
RCVR LCK
and
RCVR TRX
ON
indicators should be green, as shown in Figure 6.
Another way to verify that the controller is in the correct spot (and not on the edge) is to check the status of the
four status bits which sample the rising edge of the DCI at four different phases.
DCI PHS1
should always be
high, and
DCI PHS3
should always be low. The other bits will toggle as the LVDS controller searches for the
correct timing. The ideal case is shown in Figure 7. Increasing the value of the
FINE_DEL_SKEW
allows for a
wider search around the DCI edge, and should reduce the toggling on
PHS0
and
PHS2
. This is usually required
when the DCI signal has a lot of jitter.
Figure 7
