Re: [Ngspice-devel] Subckt.c and other

[mick t. <mic...@ya...>]

Hi Paulo,

On your question on some extractors giving out "/" in
a node-name, I believe this to be true. When one is
extracting with back annotated node-names from a
hierarchal netlist some extractors use "/" as a
separator.

I notice from recent activities on the mailing list a
lot of activity on hierarchal expansion in ngspice. If
somebody is keeping a wish list my wishes would
include

1) parameter passing (I get the impression from one of
your mails that something is there but I don't know
where it is documented).

2) Globals. It is nice to see that you are pushing for
this.

3) Passing of the multiplication factor. When a subckt
is instantiated with a multiplication factor then all
devices/instantiations inside that subckt need to get
the multiplication factor appropriately.

4) Device-Binning :- I'm not sure that it is as yet
supported inside ngspice. The device-binning would
need to be done after parameters are passed down to a
subsck instantiation.

5) The ability to use equations. Is this currently
possible. If so what is the syntax (PSpice or Hspice
compatable?).

6) Measure statements in batch mode. 

The ability to do this would bring ngspice more in
line with commercial SPICE products. You probably know
all of these anyway but I've seen no wishlist or
roadmap so this is my 5 cents...

Cheers,

Mick


--- Paolo Nenzi <p....@ie...> wrote:
> Ciao Hitoshi,
> 
> After some days spent on numparams, let's get back
> to old activity.
> 
> 
> > I have checked "greg.bug". It has following three
> bugs.
> > (1)Floating node "7_13398_8180#" exists in SUBCKT
> adc_nand2_big.
> > (2)There is not a model file "hu_dig".
> > (3)"/" is included to the node name. (This
> influences a ploting.)
> > If those are modified Ngspice can do an analysis
> correctly(?).
> > I will send you the corrected file
> "greg_bug2.cir".
> 
> Nothing to say on (1) and (2), while on (1) I am
> interested in how some
> simulator take care of floating nodes and do not
> issue an error but just
> a warning.
> 
> On (3): Do you think that some automatic netlist
> extractor can produce
> that kind of output ? In the case I think we should
> try to make ngspice
> correctly plot those nodes.
> 
> On .global: probably we need another control card
> that holds a list of
> global nodes names (IFUid ?) defined into CKTcircuit
> structure. On one
> of the three parsing pass the .global line is read,
> parsed and a list is
> built. In subckt.c in node translation, there should
> be something like: 
> 
> IF node EXISTS AND IS NOT global THEN translate.
> 
> Ciao,
> Paolo
> 
> 
> 
> 
>
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