gEDA-dev: New diagram (attempt at UML)

[John Doty]

On Apr 9, 2007, at 10:38 PM, Steve Meier wrote:

> I stop my netlister when a symbol has no associated shematic.
> source=next.sch I think is the attribute.

Yes, but that isn't always what is needed. For IC design, I generally  
want to preserve the hierarchy, so I do *not* want the netlister to  
follow the "source=" attribute, but rather include the subcircuit  
netlist. Right now, this means I can't use source= in an IC  
schematic, which is a modest inconvenience when using gschem.

For PC design, if there's a footprint= attribute, that's the place to  
stop, because if there's also a source= attribute it represents a  
circuit that's there for simulation purposes. But if you're doing  
simulation...

>
> Steve Meier
>
> John Doty wrote:
>>
>> On Apr 9, 2007, at 9:03 AM, Peter Clifton wrote:
>>
>>> It thus makes (some) sense to have a "circuit" file, which lists the
>>> page files making up one circuit. This also makes a good place to  
>>> put
>>> toplevel attributes for this circuit.
>>
>> One problem is that when you are netlisting a hierarchy, you need to
>> know when to stop, and that depends on the purpose of the netlist,  
>> not
>> on the design itself. When making a netlist for board layout, the
>> netlister should stop descending when it sees a footprint (so it
>> doesn't try to expand an internal simulation schematic). On the other
>> hand, a model should stop a simulation netlister. Remember that one
>> might, for simulation purposes, model subsystem behavior above the
>> level of parts with footprints. Or in IC design, your parts won't  
>> have
>> footprints. So there isn't necessarily just one list of pages.
>>
>> John Doty              Noqsi Aerospace, Ltd.
>> jpd at noqsi.com
>>
>>
>>
>>
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John Doty              Noqsi Aerospace, Ltd.
jpd at noqsi.com