Re: gEDA-user: Slotting

[John Doty <jpd@xxxxxxxxx>]

On Jan 17, 2009, at 6:16 PM, DJ Delorie wrote:

>
> The idea I had a while back was to use symbolic pin names in the
> symbols, and map symbolic pin names to physical pin numbers as part of
> the "heavyification" of the symbol.  The physical pin numbers are
> added to the symbol at that point.  The syntax for slots would be
> expanded, to allow for multiple levels of grouping (like, all nand
> gates, then all inputs for each nand gate) - slots vs pin groups, for
> example.

It only works for homogeneous devices. But many slotted devices are  
heterogeneous. Most are, if you want nonredundant explicit power pins.

>
> I really don't think adding a new *file* for each symbol makes sense.

In many cases symbols could share files. The slot files would contain  
only graphics and pins, and pinouts are often common among many  
similar devices.

> I do agree it should be stored external to the symbols though.  I had
> suggested some form of database (csv, sql, whatever) that maps light
> symbols (with symbolic pin names) to heavy symbols (with physical pin
> numbers).  The "inferred" attributes can be stored in the symbol in
> the design, with a flag that says "not directly user specified".
>
>
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>

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




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