Re: gEDA-user: Hierarchy viewer and database proposal

[Carlos Nieves Onega <cnieves@iespana.es>]

El mar, 21-10-2003 a las 20:16, Bill Cox escribió:
> Carlos Nieves Onega wrote:
> 
> >El mar, 21-10-2003 a las 15:16, Stuart Brorson escribió:
> >[snip]
> >  
> >
> >When placing a part, there are attributes which are defined
> >automatically, like refdes. I think that defining automatically numslots
> >and slot when placing a part will be an excellent solution, for both the
> >user and the backends. This is what I suggested, and Ales says he will
> >think about it...
> >
> Why not just assume a default slotting (1 slot) if the attributes are 
> missing.  In particular, there are applications where the concept of 
> slots don't seem to apply, like in FPGA designs.

Because it's not automatically generated. You can place a 7400 without 
defining (or forget defining) slot and numslots attributes, and I can't
assume a 7400 has only 1 slot just because the user forgot to define the
attributes properly.

I think they are necessary attributes. If they don't apply, but they
exist and are coherent, will they annoy the user?

Maybe it's not necessary to show the numslots attribute to the user,
because it's defined in the symbol, and the user shouldn't be able to
change that. But I still think slot=1 attribute should be defined when
placing a part, which is coherent for both multislotted and
non-multislotted parts.
This definition will be made by default when placing a part, and the
user will never have to change that unless he knows it's multislotted
and wants to change the slot.
There's no change in gschem's behaviour for the user, but it has the
great advantage than he can use the DRC checker, for example, just
without doing anything else.

Think about this: you have a design using non-multislotted parts, and
due to a design problem, you have to introduce a multislotted part. If
you want to pass the DRC checker (as you should do), you will have to
assign slot and numslots attributes to all parts of your design.
Will it be right for a great EDA tool ? I don't think so.

If those attributes are defined by default, you don't need to do
anything to use the DRC checker. And the user is not annoyed with such
things.

But it's just my opinion, each person has its own.

Carlos


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