Re: [Iverilog-devel] Xilinx/Vivado vs. SIMBUS

[Evan L. <sa2...@cy...>]

On 07/06/2013 00:33, Stephen Williams wrote:
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> So isim is derived from ModelSim? I did not realize that. But
> ModelSim is fairly complete and I thought it would have supported
> VPI. I guess isim/xvlog is a castrated version?

I'm pretty sure they only share the simulator engine - all the front-end 
stuff is completely different. The isim Verilog compiler is 
fantastically buggy (or it was, for several years, until I gave up with 
it a couple of years ago). I had a long list of bugs, but no-one from 
tech support ever bothered to contact me, or to do anything about them. 
I did find one very obscure run-time bug which was identical in both 
simulators, and the (other) tech support confirmed that the engines were 
the same.