Re: gEDA-user: TQFP package problem

[Steve Meier <smeier@xxxxxxxxxxxxxxxxxxx>]

I am not sure what you mean here Stuart? There is a risk that a user
would pick a symbol with pin numbers that match one physical foot print
but at layout time would select a foot print for a different packaging
of the device.

I sure would like to at least warn a user that "hey that foot print
doesn't match that symbol".

Even better would be a system similar to slots where the user could pick
the foot print at shematic time and the shematic symbol would switch to
showing  the matching symbol.

However, I suspect we can't idiot proof everything.

Steve Meier



> >> I'll take the opportunity to warn that descriptions like "64 pin TQFP"
> >> are dangerous.  QFP's come in 0.5, 0.65, 0.8, and possibly 0.4 mm pin
> >> pitch so you may find two QFP's with the same pin count but different
> >> pin pitch.
> 
> > Acording to datasheet from atmel.com atmega128 have two variants one is
> > some kind of bga
> > and the second is TQFP64_14. Then in my opinion it can be safely changed
> > from TQFP64 to TQFP64_14 in /usr/share/gEDA/sym/micro/ATmega128-3.sym.
> > Because it's quite a bit confusing when you add symbol from geda library
> > and it doesn't work.
> 
> Here's another reason to eschew heavy symbols in the gEDA distribution -- 
> Newbies just assume that they will get the footprint they want from any 
> particular symbol.  Better,
> IMO, to force everybody to manually assign the footprint after placing the 
> symbol.  That way you know what you are getting.  Or at least you have 
> only yourself to blame when things go awary.
> 
> Stuart
> 
> 
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