242 Chapter 7
Digital Signal Interface Module
Operating the N5102A Module in Output Mode
10. Enter the skew adjustment that best positions the clock with the valid portion of the data.
11. Press the
Clock Polarity Neg Pos softkey to Neg.
This shifts the clock signal 180 degrees, so that the data starts during the negative clock transition. This
has the same affect as selecting the 180 degree phase adjustment.
12. Make the clock polarity selection that is required for the device being tested.
13. Press the
Return hardkey to return to the first-level softkey menu.
The clock source selection is also reflected in the first-level softkey menu graphic. For example, if the
device is the new clock source, the graphic will show that the frequency reference is now connected to
the DUT and the DUT has an input clock line going to the N5102A module.
Generating Digital Data
Press the N5102A Off On softkey to On.
Digital data is now being transferred through the N5102A module to the device. The green status light
should be blinking. This indicates that the data lines are active. If the status light is solidly illuminated (not
blinking), all the data lines are inactive. The status light comes on and stays on (blinking or solid) after the
first time the N5102A module is turned on (
N5102A Off On to On). The status light will stay on until the
module is disconnected from its power supply.
The interface module can only be turned on while a modulation format is active. If the modulation format is
turned off while the module is on, the module will turn off and an error will be reported.
NOTE If changes are made to the baseband data parameters, it is recommended that you first
disable the digital output (
N5102A Off On softkey to Off) to avoid exposing your device and
the N5102A module to the signal variations that may occur during the parameter changes.
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