I have used Model Sim VHDL sim. It was a good simulator. In fact, Model Sim came out with VHDL sim first. It wasnt till much later that Verilog sim came out. They also have a mixed mode (Verilog and VHDL). I havent used that. ditt -- To unsubscribe from cores mailing list please visit http://www.opencores.org/mailinglists.shtml