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<< Contents
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<< Setup ToolBar
<< Sample Mode
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Like Normal Timing mode, Transitional Timing mode uses a fixed sample rate to oversample the input signals. The logic analyzer samples the active channel inputs and stores the data to internal memory at the selected sampling frequency.
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Transitional Timing is almost identical to Normal Timing mode. However, the logic analyzer only stores data to its internal logic analyzer when one or more channel inputs change value.
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Transitional Timing mode avoids duplicate samples in the trace capture. This mode uses memory very efficiently compared to Normal Timing. For any given sample depth, Transitional Timing mode captures much larger time spans compared to Normal Timing.
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Transitional Timing mode records a timestamp for each sample. The timestamp defines each sample's elapsed time.
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Since the timestamp values use half of the internal logic analyzer memory, the largest sample depth is half of Normal Timing mode.
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Even with half the sample depth, Transitional Timing normally captures a much larger time-span compared to Normal Timing mode. So unless you need the fastest possible sampling rates, we recommend using Transitional Timing mode whenever possible.
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Another big advantage to Transitional Timing mode is oversampling the input signals at 20X to 50X rate yet capturing a much large time span.
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Like Normal Timing, you must still weigh the benefits of extremely accurate resolution against the possibility of capturing unwanted noise. It is also possible to oversample inside the signal's rise / fall time specifications. This can cause "double edges" near transitions in the trace capture. So it's best practice to match the sample rate to the signal's data rate.
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By default, all channels define is a channel group detects transitions. If any signal changes value, then the sample is stored to the logic analyzer memory.
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However, you can select which channels can detect transitions plus which type of transition to detect. This is a very powerful feature of Transitional Timing mode.
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The Channels Tab topic describes how to specify which channels detect transitions.
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Copyright and trademark information
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