The zBus trigger stays high longer than expected

Tech Note: TN0144
Product: RPvdsEx
Version: All
Date Added: 2004-09-29

Issue

When the TrigIn component is configured for a software trigger, the trigger will remain high for one sample. However, if the TrigIn is configured for the zBusA or zBusB trigger the time high will depend upon the sample rate. For example, at 6 kHz the trigger will remain high for one sample, but at 25 kHz the trigger will remain high for 5 samples.

Workaround

If you wish to use the zBusA or zBusB trigger and need a single sample trigger pulse, use an EdgeDetect component to detect the rising edge of the trigger before feeding the trigger line to enable, rest, or other triggering parameters.