Re: [ng-spice] Switch problems / solutions . . .
On Fri, 27 Oct 2000, GLAO S. Dezai wrote:
> Could we use XSPICE event-driven transient simulation core ?
When they (Georgia Tech) first released it, there was a bit of
discussion about licensing and politics in one of the newsgroups. I
forgot which one. You had to order it from them, and pay a fee. It
was not much, but it was far from "open-source". I got the
impression that the researchers wanted to make it available, but some
people higher up didn't. Perhaps something to do with export
regulations. After something like 8 years, they still stick to that
policy. I think this is why the source is hard to find on the web.
It also points out what Richard Stallman means when he says "The GPL
is about freedom."
Anyway, it is a hacked spice 3. (I think it is 3c.) The hacks are
marked so they stand out. It still has global time stepping. I
didn't see anything there to indicate any notion of local time step,
so calling it event driven is stretching it a bit.
In fairness, ACS still uses global time step, but the data structures
are designed around local time step.
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