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When I run RTL simulation by irun which is mainly composed of verilog and systemverilog code, sometimes it use Incisive_Enterprise_Simulator, sometimes it use Incisive_HDL_Simulator. So ,can someone tell me what's the difference of these two simulators? Why some simulation testbench should use IES, but some other testbench use Incisive_HDL_Simulator?
I have just met a problem: when I run a test with irun command, it's queuing for one of the following license(s) - Incisive_Enterprise_Simulator. But at this time there is a free license of Incisive_HDL_Simulator. Why not use Incisive_HDL_Simulator, but waiting for IES license? It seems some simulation can only be performed by IES? Am I right?
Incisive HDL Simulator is an old licence option that, if I remember correctly, enabled SystemVerilog RTL features but not SystemVerilog testbench features, so depending on which exact SV constructs you use it may require the Enterprise Simulator (IES-XL) licence.
If you pass the "-uselic IHS:IES" option to irun or ncsim, it will try the HDL Simulator licence first, then the Enterprise one. Also, if your design contains features that aren't enabled by HDL Simulator, the simulator will print a list of the reasons why you can't use the HDL licence.
If you need to dig into more detail you might be better off filing a support request at http://support.cadence.com/ so that one of the hotline team can go into more detail with you.