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VirSim Overview
Operation Modes
VirSim presents simulation history in two user-friendly operation
modes:
• Post Simulation Mode
• Interactive Mode
Post Simulation Mode
VirSim de-couples the debug activity from event driven simulation by
using VCD+ history files as its input. In VirSim, we call this post
simulation. In post simulation, VirSim uses a Verilog or VHDL
simulator in batch mode to generate a VCD+ history file containing
the simulation results. Then, by invoking VirSim, any number of users
can simultaneously analyze simulation results recorded in the VCD+
file.
Post simulation provides the following distinct advantages:
• Frees the simulator for other users during debugging.
• Many designers can simultaneously use the results of a single
simulation.
• Debug is easier and faster when debug is performed separately
from interactive simulation.
• An equivalent debug environment is maintained independent of
simulators.
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