Re: gEDA-user: net= attributes, symbols and schematics

[John Doty <jpd@xxxxxxxxx>]

On Oct 15, 2009, at 12:54 PM, Stephen Williams wrote:

>
> I was thinking about multi-part symbols, actually. It would be
> kool to draw a symbol for all the business pins and another symbol
> for the power pins. Then I could have a sheet just for power/gnd.

That works. You just have to be careful about attributes like  
footprint: gnetlist will grab the first one it sees and ignore any  
others.

You can also use my pins2gsch script and just do pwr/gnd as a table,  
no drawing needed.

> But I wondered about netlisting and refdes support. Bummer that
> renumbering doesn't preserve relationships.

There are several renumbering scripts about, all with different  
capabilities/weaknesses. Everybody expects renumbering to read  
*their* mind ;-)

>
> Kai-Martin Knaak wrote:
>> On Wed, 14 Oct 2009 15:58:14 -0700, Stephen Williams wrote:
>>
>>> I'm planing a circuit where some chips have a wide variety of  
>>> different
>>> power supply requirements. I'm debating with myself whether I should
>>> create symbols that have net= attributes for all the various power
>>> types, or if I should attach attributes from outside the symbol, or
>>> create pins for all the various power types of the chip, or  
>>> whatever.
>>
>> Invisible information in the schematic is bad(tm). That's why I  
>> prefer
>> separated power symbols. These explicitly wear all the power pins a
>> component needs. They can be put somewhere in the backwaters of the
>> sheet. That way I avoid cluttering of the schematic but still have  
>> all
>> the power pins visible in print.
>>
>> However, support for such multi part symbols is not complete, yet.
>> Renumber does not honor shared refdeses. The part with the footprint
>> attribute has to be inserted last.
>
>
> -- 
> Steve Williams                "The woods are lovely, dark and deep.
> steve at icarus.com           But I have promises to keep,
> http://www.icarus.com         and lines to code before I sleep,
> http://www.picturel.com       And lines to code before I sleep."
>
>
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John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd@xxxxxxxxx




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