Re: gEDA-user: Method to create symbol for enhanced ICs with many pins

[kai-martin knaak <kmk@xxxxxxxxxxxxxxx>]

Stephan Boettcher wrote:

> Option 3.) I'd make a symbol for each function the chip supports,
> and instantiate a subset of those that I need, carefully annotating
> overlaps in pin usage, so that no pin is used twice accidentally.  This
> is required work for using such a chip anyway.

Note, that gnetlist cares about the sequence of symbols in the *.sch file. 
That is the order you included them in gschem matters. In particular, 
gnetlist reads the footprint attribute only from the first of a set of 
symbols with the same refdes. This affects the value attribute, too.

The result is missing footprints in the layout and/or "unknown" value in the 
layout. 

You can prevent this by either:

a) attach footprint and value attributes to each and every symbol of a set.
Downside: Redundant information. Conflicting values may slip unnoticed.

b) Write a patch to fix this bug 
Downside: The developers may not like your approach. In this case your 
schematics will only process cleanly with your locally patched version of 
gnetlist. Bad for sharing.

c) Rearrange the order of symbols in the file with a text editor.
Downside: laborious.

d) write a script to move the symbol that contains footprint attributes to 
the top of the file.
Downside: Yet another component in the work-flow.

I did b) last year, got dismissed, and default to option c) for schematics 
I'd like to share.

---<)kaimartin(>---
-- 
Kai-Martin Knaak
Ãffentlicher PGP-SchlÃssel:
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x6C0B9F53



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