Implicit and explicit virtuals
An implicit virtual is a virtual signal that was automatically created by ModelSim without your knowledge and without you providing a name for it. An example would be if you expand a bus in the Wave window, then drag one bit out of the bus to display it separately. That action creates a one-bit virtual signal whose definition is stored in a special location, and is not visible in the Signals window or to the normal virtual commands.
All other virtual signals are considered "explicit virtuals".
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