Re: [Iverilog-devel] Generate scope change in vvp and the VPI API for development

[Iztok J. <izt...@gm...>]

Hi Tony,

I was not able to learn much about the FSDB format, and it seems it is not
supported by the tools I have available (INCISIVE, ModelSim Altera). But is
you have access to an appropriate simulator, I acreated a few examples
which can be used to observepacked/umpacked structures/arrays (unions are
missing here). There are 2-state types in datatypes.sv, and strings in
t_string.sv. An interesting feature would be to show value names for
enumerated data types.
https://github.com/jeras/waveform_examples

What is missing are unions, interfaces, modports, dynamic arrays, queues,
classes, ...

I hope this helps, somehow.
Regards,
Iztok Jeras


On Sat, Jul 20, 2013 at 7:38 PM, <by...@nc...> wrote:

> > I know this is not strictly about Icarus Verilog, but since you mentioned
> > it, there are some other things I would like to see in GTKWave. I will
> just
> > make a list, since I do not have time to run tests now.
> >
> > 1. to show signals inside the module scope differently then module ports
> > 2. to show port directions
> > 3. to show parameters (ModelSim exports parameters to VCD)
> > 4. hierarchical display of packed structures and arrays
> > 5. display of interfaces as both instances and ports
> > 6. display of SystemVerilog classes
>
> #1 and #2 have been in gtkwave in SVN for about a week.  The only formats
> that gtkwave can read that currently support it are FST and FSDB.  Existing
> FSDB files from VCS read fine and ports/direction are intact.  For FST, I
> am unaware of any current simulators writing port direction info though I
> think CVC will be soon to add it.  Note that for FST, vcd2fst can work to
> convert FSDB to FST (with port information intact) provided this line pops
> out of ./configure:
>
>   EXTLOAD_CFLAGS        : -DEXTLOAD_PATH=\"/pub/fsdb/bin/fsdbdebug\"
> -DEXTLOAD_SUFFIX=\"fsdb\" -DEXTCONV_PATH=\"/pub/fsdb/bin/fsdb2vcd\"
>
> You need to ensure those executables from an nWave install are in path as
> both are used during conversion.  The vcd file alone from fsdb2vcd is not
> enough as information is missing that is provided by fsdbdebug.
>
> For accelerated (not slow via fsdbdebug) reading of FSDB files, and also
> without using -o (via fsdb2vcd then vcd2fst) if the above EXTLOAD stuff is
> satisfied, you need these libraries and the accompanying c++ headers:
>
>   FSDB_CFLAGS           : -DFSDB_NSYS_IS_PRESENT -DFSDB_IS_PRESENT
> -I/pub/FsdbReader
>   FSDB_LDADD            : /pub/FsdbReader/libnsys.so
> /pub/FsdbReader/libnffr.so
>
> ...then FSDB looks like any other available filetype.
>
>
> > How much is actually not implemented in Icarus and how much is not
> > supported by waveform file standards. Is there actually a free waveform
> > format supporting all this?
>
> VCD doesn't support any of the #1-#6 above.  What I would need to see is
> an FSDB file that contains examples of all that stuff so I can (1) see what
> Verdi does, and (2) see how it is stored internally in the file.  I say
> FSDB because VCS (or whatever) has an established format for doing this
> already that could provide good guidelines to free solutions.
>
> As far as parameters go (#3), isn't that an Icarus dumper thing?
>
> For #4, there is hierarchical structure stuff that Bluespec writes to VCD
> as well as the save files, but I don't remember how it works, simply that
> it does.
>
>
> > The Verilator teem is also behind here, they only support VCD files, but
> > they have made some progress supporting SystemVerilog interfaces, so I
> > could check how are those displayed in GTKWave.
> >
> > Regards,
> > Iztok Jeras
>
> I'm not a verification guy currently, so I'm completely ignorant of SV
> interfaces.  Again, I'd need to see an FSDB file that has all this stuff
> and be pointed to it.
>
> -Tony
>
>
> ------------------------------------------------------------------------------
> See everything from the browser to the database with AppDynamics
> Get end-to-end visibility with application monitoring from AppDynamics
> Isolate bottlenecks and diagnose root cause in seconds.
> Start your free trial of AppDynamics Pro today!
> http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk
> _______________________________________________
> Iverilog-devel mailing list
> Ive...@li...
> https://lists.sourceforge.net/lists/listinfo/iverilog-devel
>