Re: [Iverilog-devel] SDF back annotation support

[Patrick <pat...@gm...>]

Hi Cary,

Thank you very much for getting back to me on this question. I really
appreciate it.

Best regards,
Patrick

On Mar 15, 2017 07:11, "Cary R." <cy...@ya...> wrote:

> I did a lot of work on the SDF support a number of years ago. I added what
> I could and then tried to make it ignore anything Icarus couldn't support.
>
> Interconnect delays are not supported by the run time and there is no
> other construct we can use to support them.
>
> It has been a while so I don't remember exactly what part of the COND was
> not supported (I think it was matching the condition expression in the SDF
> to the internal expression), but if it was not a major effort I'm sure I
> would have added support for it instead of dropping it with a warning.
>
> Icarus is a good RTL simulator, but not a very good gate level simulator.
> If you need to run gate level simulations with a SDF file then you are
> going to need something else. Also realize that most gate level simulations
> need to have the timing checks working correctly and these are also
> currently not supported by Icarus.
>
> Cary
>
>
> On Wednesday, February 1, 2017 1:17 PM, Patrick <pat...@gm...>
> wrote:
>
>
>
> Hi developers,
>
> First of all thank you for your great efforts in developing icarus verilog!
>
> I would like to use icarus verilog to run a back annotated simulation
> (using an SDF file).
>
> At first I had some problems getting the simulation to run and I got the
> following errors:
> SDF ERROR: Too many errors: syntax error
> 1:SDF ERROR: Invalid DELAYFILE format
> This was caused by the file-format of the SDF file. Running the dos2unix
> command on the SDF file solved this problem.
>
> The simulation is now running, but I am getting a lot of warnings (~42k).
> Most notably of the form:
> - SDF WARNING: INTERCONNECT not supported.
> - SDF WARNING: COND not supported.
>
> My questions are:
> 1) Are there any plans for supporting these SDF constructs in the future?
> 2) Would it be possible to use a work-around (for instance by replacing
> INTERCONNECT with something else that is supported)?
>
> Thanks and best regards,
> Patrick
>
>
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