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Subject:	Re: [geda-user] xspice integration
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From:	"Glenn (glimrick AT epilitimus DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Date:	Sun, 25 Apr 2021 10:29:32 -0800
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mhx AT iae DOT nl wrote:
>
> XSPICE is not a SPICE superset. Maybe it should be called a symbiote.
> First, XSPICE *adds* a completely new discrete event handler/simulation
> engine to SPICE. Second, a new codemodel device is added to the list
> of devices that NGSPICE supports. This codemodel can use both the old
> analog simulator and the new event-base engine.
>
In part this is the result of my using a mental shorthand of xspice
meaning "ngspice built with the --enable-xspice configuration switch".
So yes XSPICE is distinct from SPICE but from the point of view of
someone looking at processing a netlist, xspice is a superset of ngspice
in as much as you aren't calling a different program just an extended
version of the program, if that makes sense.

Everything you say is true. I was trying to keep it simple. Roland may
or may not be interested in all the gory details. I am relying on him to
request more detail where he feels it is needed for what he is doing.
> Because of the way it is written, XSPICE also adds new syntactic
> elements to (NG)SPICE. The most important one is that it becomes
> possible to not only handle pins, but also ports: lists of pins,
> where each pin can have a specific type. Using ports it is possible
> to have subcircuits that handle busses (e.g. a subcircuit that
> supports not only a single AND device, but any number of these).
>
Interesting, I inquired on ngspice-user a while back about passing node
vectors to subcircuits and pretty much got crickets back. Maybe that
isn't what you are talking about here though.

> I prefer to say that it is still done by hand. It still has to be
> defined as a subcircuit using resistors, transistors etc., but
> it can now also use the codemodel device in addition. And as a bonus,
> one can add a dual 556 or quad timer 558 with no other changes
> than specifying ports with a different number of pins.
>
Code models really aren't within the scope of the netlist generation
software since they are in the ngspice/xspice code space.

I was happy to see that ngspice now supports run time loading of code
models but (at least in ngspice-34) they are loaded at init time and the
ngspice core needs to know about them at build time. I have some
preliminary ideas on changes which would make code model support truly
dynamic, but that work is still very early.

> Full support of XSPICE (or NGSPICE) needs changes to the schematic
> entry package and the netlister.
>
You may want to look at what I have done so far.
http://epilitimus.com/git_repos/xspice.git

And feel free to offer any fixes/improvements.

Glenn

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