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