Re: gEDA-user: gnetlist

[Paul Tan <pt75234@xxxxxxx>]

Hi Levente Kovacs,

gnetlist front end(the C/SCM part) already support the
non-flatten hierarchical netlist formats including BUS,
such as Verilog, VHDL, Spice, GnuCap, etc., depending
on the state of the gnetlist backend support.

The Spice back end netlister (gnet-spice-sdb.scm) provides
some support of hierarchy, although limited, but it is a
good start.

I had also posted several discussions and how-to over
the past few years about hierarchical netlist
(including BUS) generation from gnetlist backends, a
Verilog specific implementation with example was provided
in:
  http://archives.seul.org/geda/user/Jan-2009/msg00056.html
  (although it was coded in BASH, it can easily be done in
   Scheme script, Makefile, etc)

However, most PCB netlists use the flat hierarchy formats,
which are structurally very different from the non-flatten
hierarchical formats. The good news is that since there is
already enough interface information provided by the gnetlist
front end to the back end (the Scheme script part) to
support the non-flatten netlists (including BUS), then
theoretically, there are enough informations provided
by the front end to the PCB Scheme Script backends to support
the flat netlist (and BUS) too.

Architecturally, I would like to see the various back end
netlisters to implement their back end specific parts, without
impacting the overall generic interface provided by the gnetlist
front end.  Even if we ever decide(?) in the future to replace
the current Scheme scripting language to a more modern scripting
language, such as Python or Ruby, the generic interface
provided by the gnetlist front end will still give us
tremendous advantage to support numerous diverse back end
tools and netlists.  There are similar C/SCM interface
provided by Python and Ruby.

Some description of differences in hierarchical netlists
can be found at:
  http://en.wikipedia.org/wiki/Netlist

Best Regards,
Paul Tan



-----Original Message-----
From: Levente Kovacs <leventelist@xxxxxxxxx>
To: geda-user@xxxxxxxx
Sent: Sun, Apr 11, 2010 4:04 am
Subject: gEDA-user: gnetlist


Hi,


I can't find any documentation about the hierachy support in gnetlist

http://geda.seul.org/wiki/geda:gnetlist_ug#hierarchy_support

Is there any documentation about hierarchy support?

Is there any way to create PCAD netlist with gEDA?

Thanks,
Levente

--
Levente Kovacs
http://logonex.eu




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