Re: gEDA-user: Power nets in hierarchy

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

Hi,
I have had a design where I used part of other design.
I made a hierarchical block for the part containing the parts of the
previous design, and included it in the new one.
This seems easy. 

The VCC of the old design was global (the same for all the design), but
in the new one, VCC and GND of that part were not the same as the global
VCC or GND of the new design.
So, I would recommend that there were power ports, and power nets (like
VCC, GND and so on) use those ports to hierarchical connections.

It would make the life simpler and improve the readability of the
designs in a few situations...

Carlos

El mié, 22-10-2003 a las 18:45, Stuart Brorson escribió:
> Why not just define an attribute "GLOBAL" which you could attach to a
> net?  A global net would then have two attributes: NETNAME and GLOBAL,
> for example:
> 
> NETNAME=VCC
> GLOBAL=1
> 
> Then the netlister would know directly what type of net it was
> handling, instead of having to figure it out from the attached
> schematic symbol.  In any event, I often just use named nets for power
> instead of attaching a power symbol.  Finally, there are other common
> nets which aren't power nets but are also globals, such as RESET.
> Nets like RESET don't always have an accepted device symbol.
> 
> Stuart
> 
> 
> 
> > 
> > Hi.
> > 
> > I'd like to have a device type like 'power' for power bus symbols like 
> > vdd and vss.  Rather than trying to overwrite the name of the net 
> > connected to these symbol's pins, I'd like to leave them alone until 
> > after flattening.  Then, I can have a simple pass that changes the name 
> > of power nets to that of the power symbol.  I would merge multiple 
> > instances of such nets at this time.
> > 
> > This is different functionality that that given with the 
> > net=<netname>:<pinlabel> attribute.  That attribute assigns pins on 
> > footprints to signals, even when they are not available on the symbol. 
> >  Power devices would globally override nets after flattening, but would 
> > have no effect until then.
> > 
> > What do you think?
> > 
> > Bill
> > 
> > 
> 
> 
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