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VirtualBench can generate a trigger on a digital signal. You must specify a source and an edge.
A digital trigger is usually a TTL signal with two discrete levels: a high and a low level. When the signal moves from high to low or from low to high, a digital edge is created. A rising edge is a transition from a low logic level to a high logic level. A falling edge is a high-to-low transition. The following figure shows a falling-edge trigger.
The digital edge trigger source for the oscilloscope can be any of the following signals: