Encore SIM EDITOR SOFTWARE User's Guide Page 335

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12-9
Event Origin
Using the +vpddrivers option can aid in debugging problems with
multiple drivers since you can see the values of each driver instead
of only the resolved value (see
Simulator Run-Time Options on
page 17-24).
For register variables, which are commonly assigned values by
multiple statements throughout the course of a simulation, it is
exceedingly difficult to determine which line of code correlates to a
particular value change using standard debug facilities. The Event
Origin feature can leverage some of the more advanced capabilities
of VirSim to help with these problems. Saving line trace data can
eliminate the consideration of drivers that were not executed at the
time of the change (see
Chapter 17, VCD+ (vpd) File Generation).
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