Quantum Data Gen 2 980, User Manual

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980 HDMI Protocol Analyzer User Guide Rev. A1
Page 207 December 19, 2012
9.2.4 Initiating a Capture
Typically in the Capture mode you will want to specify a manual capture. With the manual capture, you can monitor
the downstream HDMI sink device for particular behavior or symptom to a problem and then initiate a capture
when the particular condition exhibits itself. This ensures that the relevant data
—data related to interoperability—is
captured.
Use the procedures below to initiate a new capture.
1. (optional) If you are going to be taking some action on the device under test that will halt video, such as
unseating and reseating the HDMI cable, you will need to check the Video Check box in the Capture
Configuration section of the Capture Control dialog box.
2. Check the Generate Hot Plug on Capture Start button if you want the 980 HDMI Protocol Analyzer to issue a
hot plug to initiate HDCP authentication. You also need to specify the duration of hot plug pulse in
milliseconds.
3. Set the Capture Buffer Size slidebar to a percent value to meet your requirements. You can capture up to
about 2GB of data which is about 1150 frames at 576p/480p and about 204 frames at 1080p which includes
the video. If you do not want to capture the video and only capture the metadata, you can store well over
100,000 frames of data.
4. Set the Trigger Position within the Buffer slidebar to a percent value to meet your requirements. This slide
bar enables you to set the position of the trigger event within the captured data. This is a slidebar that provides
an indication (on the left) of the location within the captured data, expressed as a percent with 0% indicating
that the trigger event occurs at the beginning of the captured data and 100% indicating that the trigger event
occurs at the end of the captured data.
Note : When using a Manual trigger it is important to set the Trigger Position to ensure that there is some
captured data prior to the manual trigger start point. The manual trigger is particularly useful when you are
observing the behavior of a connected sink and then manually initiating the trigger when a particular symptom
exhibits itself. Typically, you should move the trigger position to the right nearer the 100% mark. This way you
ensure that there is data prior to the trigger event by accounting for reaction time between the time the
symptom occurs and you initiate the trigger.