Re: gEDA-user: Different slot types within on symbol

[John Doty <jpd@xxxxxxxxx>]

On Nov 21, 2010, at 7:30 PM, Peter Clifton wrote:

> That is a slightly bad
> example though, as all the 74* symbols in the library also have hidden
> "net=" attributes which wire up their power pins. The idea is solid
> though.

Every tutorial on gEDA should state up front:

LIBRARY SYMBOLS ARE ONLY STARTING POINTS. COPY AND CUSTOMIZE THEM TO FIT *YOUR* DESIGN FLOW AS NEEDED.

So, if you want to use separate power symbols, copy the library symbols to your project's symbol repository, and delete the net= attributes. 

That the symbol browser doesn't copy the symbol to a project repository by default (assuming that this is defined in gafrc) is a problem. It perpetuates the illusion that the library is universal to all flows, and that such a library is possible. On the other hand, ONCE YOU HAVE MADE THE PROJECT LOCAL COPY, Hierarchy->Down Symbol is very useful.


John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd@xxxxxxxxx




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