kicad-developers team mailing list archive

[Wayne Stambaugh <stambaughw@xxxxxxxxx>]

On 1/2/2019 8:24 PM, Rene Pöschl wrote:
> I have a few questions regarding multi part (or multi unit) symbols. (I
> do not really see a clear indication for these features in your document.)
> 
> Is there a definition for having only some units exchangeable?

This is provided by the extends keyword.  In the provided 7400 example,
all four gates are extended from the same base part so they would be
interchangeable.

> Is there a way to define a unit as "must be placed" or "optional"?

I added a power keyword to denote power symbols so any power symbol
defined as a sub-unit of a symbol would be required.

> Is there a way to mark a unit as "power unit" (I think you mentioned
> sometime back that this might be required to properly make simulation
> for multi unit symbols possible while still allowing the power unit to
> be separate. A power unit would also be a "must be placed unit" but i
> feel separating these two might add more flexibility.)

See definition above.  I'm not sure having a "required" keyword is
useful.  Do you have an example in mind.

> 
> On 01/01/19 20:59, Wayne Stambaugh wrote:
>> I have updated and published the symbol file format[1] for comment.
>> Hopefully there isn't too much to change.  The only thing to really
>> finalize is the internal units.  The initial concept was unitless but
>> the more I think about it and discuss with other developers, it makes
>> more sense to use units for the following reasons:
>>
>> 1. It's easier to visualize in your head how the symbols on a given page
>> size will layout.
>>
>> 2. Converting from other file formats (Eagle, Altium, etc) will be
>> easier since most if not all of them have a defined unit.
>>
>> I'm thinking 10u (or possibly 100u) will make a good internal units
>> value.  Once we nail down the units, I will update the file format
>> document accordingly.
>>
>> Please keep in mind that this is the symbol library file format document
>> so things like constraints belong in the schematic file format.  I will
>> be posting the schematic file format as soon as I finish updating it.
>>
>> Cheers,
>>
>> Wayne
>>
>> [1]:
>> https://docs.google.com/document/d/1lyL_8FWZRouMkwqLiIt84rd2Htg4v1vz8_2MzRKHRkc/edit
>>
>>
>>
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> 
> 
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