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ModelSim

The ModelSim backend is used to simulate designs using Mentor Graphics ModelSim simulator. ModelSim is a proprietary simulator that supports Verilog, VHDL and SystemC.

In order to use the ModelSim backend, the environment variable $MODEL_TECH must be set to <modelsim install path>/bin

The following file types are recognized by the ModelSim backend

  • verilogSource

  • verilogSource-95

  • verilogSource-2001

  • verilogSource-2005

  • systemVerilogSource

  • systemVerilogSource-3.0

  • systemVerilogSource-3.1

  • systemVerilogSource-3.1a

  • vhdlSource

  • vhdlSource-87

  • vhdlSource-93

  • vhdlSource-2008

  • tclSource

  • user

Configure

During the configure phase, build commands for all VHDL, Verilog and SystemVerilog files are written to a TCL file called fusesoc_build_rtl.tcl. The vlog command is used to build (system)verilog files, and additional options for this command can be specified with the vlog_options parameter in the [modelsim] section. If the design also contains any VPI libraries, an additional Makefile is created with instructions for how to rebuild them.

A top-level TCL script called fusesoc_main.tcl is created to execute fusesoc_build_rtl.tcl, the VPI Makefile and also any additional files with the file type tclSource found in the design

During the configure phase, FuseSoC also prepares scripts to run the simulation in GUI mode or batch mode. The script fusesoc_run.tcl contains the command to launch a simulation together with all the extra parameters that were specified on the command line. This can be used for launching ModelSim in GUI mode or batch mode, e.g. by calling vsim -do fusesoc_run.tcl

Build

During the build phase, the fusesoc_main.tcl script is executed.

Run

During the run phase, vsim -c -do fusesoc_run.tcl -do "run -all" is called to run the simulation in batch mode

To rebuild the complete simulation model from within a running ModelSim instance, execute fusesoc_main.tcl, or fusesoc_build_rtl.tcl to just rebuild the RTL files. Note that these commands only operate on the exported design.