IDT designers run both the UNIX (5.6d se & 5.7a se and PC (5.6d pe) versions of Modelsim to verify the VHDL models. The Modelsim PE simulator works on many Windows platforms. It is not supported on any of the other OS's.

Modelsim comes in a number of versions including: the Personal Edition (Modelsim PE) and the Special Edition (Modelsim SE). Both offer dual language support - Verilog and VHDL. Modelsim PE is for PC-based FPGA designs. Modelsim SE has additional features and sign-off support necessary for cutting-edge ASIC and high-end FPGA development on both PCs and UNIX workstations.