Quantum Data Gen 2 980 User Manual page 121

980 HDMI Protocol Analyzer User Guide Rev. A1
Advanced Pre-Capture Filtering using Data Match Definition
If you are using the Match function for advanced triggering, you will have to define the pre-capture filter using a
different Match definition. For example if you are using Match 1 to set the triggering, you should use Match 2 or 3
for pre-capture filtering.
You can either define a pre-capture filter: 1) for a single specific data island type, 2) for all data islands, or 3) for
several types of data islands. If you wish to capture all data islands you use the default setting of "Custom" in the
Match definition. This selection can be found in the Data Island Match Editor on the right side under the heading
labeled, Data Island Type. If you wish to capture only a single type of data island, then you specify that type in the
Match definition from the pull-down selection menu.
The example in the figure below shows that the user is defining a trigger condition (or pre-capture filter) based on
the value of the video type of the AVI infoframe. Note that you will have to know the binary values of the data island
field in order to specify the criteria. This may require that you refer to the HDMI specification and CEA-861-D.
There are two tables on the left side of the panel: Data Bytes and Masks. You do not have to set the Masks; they
will be set for you when you select an item under the Field in the table on the right. For example in the screen
below, RGB/YCbCr Indicator is selected and the mask that applies to those bits, are selected for you. You then
have to select the values in the Data Bytes area to define the match criteria. In the example below, the match
condition is set such that if the 980 receives incoming video with a video type of YCbCr 4:4:4 (Hex 40 Y1=1, Y0=0),
it will display the data in the appropriate data panel.
Page 121 December 19, 2012