With [[RF.Spice A/D]] you can also view live digital timing diagrams during a live [[Digital Simulation|digital simulation]]. Click on the "Show/Hide Live Digital Timing Diagram" [[File:b2Timing_Tool.png]] button in the [[Schematic toolbar|Schematic Toolbar]]. Initially nothing happens. A soon as the [[Digital Simulation|digital simulation]] starts, a graph window opens up at the bottom of the screen that shows live timing diagrams for all the input and output devices. As you continue to step the time, these graphs expand. Similar to other graphs, the digital timing diagrams have their own settings dialogs in the Toolbox. Note that the timing diagrams are updated only when a change occurs in your circuit.
<table><tr><td>[[File:B2TUT4_13.png|thumb|center|600px640px| Live digital timing diagram during a live digital simulation.]]</td></tr></table>
<b>Running a [[Digital Simulation]] as a Transient Test</b>
A live simulation is indeed a perpetual (time-domain) transient simulation. If your digital input values are known in advance as a function of time or time step index, you can alternatively run a transient test of your digital circuit. In this case, you need a digital source as your input. You can use one ore more digital probes for the output. The results will appear as timing diagrams in a graph window at the end of the transient test.
<table><tr><td>[[File:B2TUT4_19.png|thumb|center|600px640px| A graph generated at the end of a transient test of a digital circuit.]]</td></tr></table>
==Propagation Delays==