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ModelSim is a multi-language environment by Siemens[1] (previously developed by Mentor Graphics,[2]) for simulation of hardware description languages such as VHDL, Verilog and SystemC, and includes a built-in C debugger.[3][2] ModelSim can be used independently, or in conjunction with Intel Quartus Prime, PSIM,[4] Xilinx ISE or Xilinx Vivado.[5] Simulation is performed using the graphical user interface (GUI), or automatically using scripts.[6]


Mentor HDL simulation products are offered in multiple editions, such as ModelSim PE and Questa Sim.

Questa Sim offers high-performance and advanced debugging capabilities, while ModelSim PE is the entry-level simulator for hobbyists and students.[2] Questa Sim is used in large multi-million gate designs, and is supported on Microsoft Windows and Linux, in 32-bit and 64-bit architectures.[2]

ModelSim can also be used with MATLAB/Simulink, using Link for ModelSim.[7][8] Link for ModelSim is a fast bidirectional co-simulation interface between Simulink and ModelSim.[8][7] For such designs, MATLAB provides a numerical simulation toolset, while ModelSim provides tools to verify the hardware implementation & timing characteristics of the design.[8]

Language support[edit]

ModelSim uses a unified kernel for simulation of all supported languages, and the method of debugging embedded C code is the same as VHDL or Verilog.[2]

ModelSim and Questa Sim products enable simulation, verification and debugging for the following languages:[2]

See also[edit]


  1. ^ "ModelSim".
  2. ^ a b c d e f Handbook of Digital Techniques for High-Speed Design, Pearson Education India, 01-Sep-2007
  3. ^ Reconfigurable Embedded Control Systems, Idea Group Inc (IGI), 30-Nov-2010
  4. ^ "PSIM ModCoupler: VHDL & Verilog with Modelsim". Powersim, Inc. Retrieved 2021-06-01.
  5. ^ Digital Hardware Design, Laxmi Publications, Ltd., 01-Sep-2008
  6. ^ Synthesizable VHDL Design for FPGAs, Springer Science & Business Media, 21-Oct-2013
  7. ^ a b Industrial Control Technology, William Andrew, 12-Aug-2008
  8. ^ a b c Recent Advances in Modeling and Simulation Tools for Communication Networks and Services, Springer Science & Business Media, 20-Sep-2007

External links[edit]