Re: gEDA-user: Slotting and visible power connections

[Joerg <joergsch@xxxxxxxxxxxxxxxxxxxxx>]

Peter Clifton wrote:
> On Wed, 2008-11-05 at 09:33 -0800, Joerg wrote:
>> Bernd Jendrissek wrote:
> 
> [snip]
> 
>>>> In
>>>> gschem you'd have to design a separate power pair for pretty much every
>>>> part that has more than one slot. Can be done but kind of messy.
>>> Not on my fork: you can have one power pair symbol that you use for
>>> all parts that have such a pair of power pins.
>>>
>> That doesn't work well on analog designs. Often you must filter the 
>> supply of one 74HC14 because it is used as a low noise oscillator, but 
>> not on all the others. Or a design I just had where more than a dozen 
>> opamps of same type all had to have their own personal supply.
> 
> I think you missed the point Bernd was making. His fork allows truly
> generic symbols, such as an "opamp", "set of power pins", and those
> would be placed on the schematic. His fork then has a separate
> association, say - for example, between (four opamps, one power-pins),
> and maps those onto a package.
> 
> His point was that given the generic block / gate / amplifier symbol for
> the task, and one (or more?) generic power rail symbol(s), you could
> then describe most parts without further drawing - assuming you have a
> database which knows the appropriate function and pin number mappings.
> 

That is tough to understand for a non-programmer like me. If this means 
that you can add power symbols onto packages at the first slot, yes, 
that would work. Not sure about the database though. Heck, I don't even 
know what SW pros mean by "fork" :-)

I've just tried this in KiCad. Initially it does the same thing, on a 
dual opamp such as the LM358 both halves show up with power pins. No 
idea why. But you can then copy that part into your own library and do a 
"pin edit". This allows you to set certain pins so they only show up on 
the first slot. You can do this by unchecking the box "Common to units" 
for each power pin. Now when you place that device the first slot has 
power pins and all subsequent ones don't, until you need the next device 
because you have used up all the slots.

The individual slots also show up as U?A, U?B and so on, maybe it would 
be an idea to do that in gschem as well since it's industry practice.

-- 
Regards, Joerg

http://www.analogconsultants.com/

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