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vsim

ModelSim Command Reference ModelSim EE/PLUS Reference Manual

-restore <filename>

Specifies that VSIM is to restore a simulation saved with the

checkpoint

command (p291).

Optional. Use the

-nocompress

switch (above) if compression was turned off when the

checkpoint

command (p291) was used or if VSIM was initially invoked with -

nocompress

. See additional discussion in "How to use checkpoint/restore" (p530); -

nocompress

is also an option of the

restore

command (p357).

-sdfmin | -sdftyp | -sdfmax [<instance>=]<sdf_filename>

Annotates VITAL or Verilog cells in the specified SDF file (a Standard Delay Format file)

with minimum, typical, or maximum timing. Optional. The use of [<instance>=] with

<sdf_filename> is also optional.; this is used when the back annotation it is not being done

at the top level. See "Specifying SDF files for simulation" (p436).

-sdfnoerror

Errors issued by the SDF annotator while loading the design prevent the simulation from

continuing, whereas warnings do not. Changes SDF errors to warnings so that the

simulation can continue. Optional.

-sdfnowarn

Disables warnings from the SDF reader. Optional.

See "ModelSim and VITAL" (p431) for an additional discussion of SDF.

-t [<multiplier>]<time_unit>

Specifies the simulation time resolution. Optional; if omitted, the value specified by the

Resolution variable (p420) in the

modelsim.ini

file will be used. If Verilog

‘timescale

directives are found, the minimum time precision will be used; <time_unit> must be one of:

fs, ps, ns, us, ms,

sec

The default is 1ns; the optional <multiplier> may be 1, 10 or 100. Once you’ve

begun simulation, you can determine the current simulator resolution by invoking

the

report

command (p354) with the

simulator state

option.

-tag <string>

Specify a string tag to append to foreign trace filenames. Optional; used with the

-trace_foreign <int>

option. Used when running multiple traces in the same directory. See

"Invoking a trace" (p487).

-title <title>

Specifies the title to appear for the VSIM Main window. Optional. If omitted, "Model

Sim

VHDL/Verilog " is the window title. Useful when running multiple simultaneous

simulations.