Re: [myhdl-list] Re: printing vcd files for custom objects

[bedros <be...@ya...>]

Jan,

My comments are below.

--- Jan Decaluwe <ja...@ja...> wrote:
> bedros wrote:
> > Jan,
> > 
> > Thanks a lot for providing myhdl. I used it to
> model a
> > design and I'm very impressed.
> > 
> > However, it still needs a lot of work. I made some
> > changes to files (_Signal.py and _traceSignal.py)
> to
> > allow printing vcd output of a custom object
> (class)
> > instead of only int and intbv.
> 
> The fallback behavior for any type should be to
> print
> the string representation (from str()) as a VCD
> string
> output. I think this is the best one can do for the
> general
> case. Could you explain why it does not work for
> you?

printing __str__ attribute of a user-defined object
(custom class) should work, but we need to pass the
code generator (_genNameCode()) to the class to
allocate symbol(s) for the object. Because
traceSignals class allocates only one symbol per
object (for VCD format)


> 
> You are more than welcome. An interface to a popular
> VHDL
> simulator would be a real value. Some remarks:
> 
> - some time ago another engineer offered help to
> provide
> a cosimulation interface to VHDL. I explained the
> needs,
> also warning that this kind of development is not
> necessarily
> fun (from my experience with the Verilog PLI -
> though it's
> real fun to have it once it works.) I have not heard
> from
> him since ...
> 
> - last time I checked I believe Aldec's PLI did not
> have
> the capability to write values to signals (only to
> read
> them). In that case, we don't have a solution.
> 
> Keep up the good work, and let us know about it!
> 
> Regards, Jan

I'll be working on myhdl as a part of my current job.
I need a modeling language/platform to make the right
design decisions before I start coding in VHDL. and
having a library like myhdl will save me a lot of
time.  All my contribution would be free of charge,
because  we're not an EDA company and I was going to
do it on my own from the scratch anyway.

-Bedros