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Subject: Re: [geda-user] first attempt at bus support in gnetlist for pcb
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From: John Doty <jpd AT noqsi DOT com>
In-Reply-To: <201601080714.u087Ejj5032766@envy.delorie.com>
Date: Sat, 16 Jan 2016 12:03:44 -0700
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Been playing around with this as a general-purpose plug in for more than =
just a subset of gpcb flows. Difficulties:

1. For netlists flattened by gnetlist, we have a configurable syntax for =
net renaming before the Scheme stuff gets the data. The bus syntax here =
will have some difficulty with that.

2. For genuinely hierarchical netlists, there=92s probably not a single =
one-size-fits-all plug in solution. Not today.

3. For pinseq-centered netlisting (SPICE), it needs to expand pinseqs, =
too.

Another issue is that =93-=93 seems a little strange as a range token. =
=93:=94 would match Verilog and some programming languages for more user =
familiarity.

I suggest using Dirac-style angle brackets to designate a bus =
definition, so a typical example might be "<nBL,A[8:2]>=94. While I =
think a sufficiently aware gnetlist plugin could navigate this without =
the extra tokens, we=92ve historically exploited the transparency of our =
formats to process schematics with other tools as well. The extra tokens =
will help.

On Jan 8, 2016, at 12:14 AM, DJ Delorie <dj AT delorie DOT com> wrote:

>=20
> http://www.delorie.com/pcb/gnet-pcbfwd-bus.scm
>=20
> This is a replacement for gnet-pcbfwd.scm which PCB's File->Import =
uses.
>=20
> (If the scheme coding itself bothers you, you may use that as an
> argument in the scheme debate - whether for or against is up to you.
> Keep in mind this took me many nights to figure out :-))
>=20
> It expands lists in netnames and pin numbers like this:
>=20
> 4-7 becomes 4,5,6,7
> 7-4 becomes 7,6,5,4
>=20
> -then-
>=20
> sym[1,2,3] becomes sym1,sym2,sym3
>=20
> -then-
>=20
> assignments between lists of netnames to lists of pinnumbers are
> matched up one-to-one.
>=20
> assignments between one netname and a list of pinnumbers are matched
> up one-to-many.
>=20
> Likewise for pin numbers and pin labels.
>=20
> The net result of this is that you can assign a net named "nBL,A[8-2]" =
to
> a pin labelled "A[0-7]" and numbered "1-4,10-7" and they'll all get
> hooked up as appropriate.
>=20
> You can also have a pin named "GND" and numbered "1,15,18" connected
> to net "GND" and it will connect all three pins to the one net.
>=20
>=20
> Constructive feedback welcome!
>=20
> DJ
>=20

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com



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