3Acquisition Mode
The Acquisition mode field allows you to specify the mode in which you want the timing analyzer to acquire data. You are given two choices for the mode of acquisition: Transitional and Glitch. When you touch this field, the field toggles from one mode to the other.
Transitional Acquisition Mode. When the logic analyzer is operating in the Transitional Acquisition mode, it samples the data at regular intervals, but it stores data in memory only when there have been transitions in the signals since the last data sample was stored. A time tag that is stored with each sample allows reconstruction of the samples in the Timing Waveforms display.
Transitional timing always samples at a rate of 100 MHz (10 ns/sample). This provides maximum timing resolution even in records that span long time windows. Time covered by a full memory acquisition varies with the number of pattern changes in the data. If there are many transitions, the data may end prior to the end of the time window desired because the memory is full. However, a prestore qualification in your logic analyzer insures that data will be captured and displayed between the left side of the screen and the trigger point.
The figure below illustrates Transitional acquisition, comparing it to Traditional acquisition.
Figure 5-32. Transitional Timing vs. Traditional Timing
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