kicad-developers team mailing list archive

[Thomas Pointhuber <thomas.pointhuber@xxxxxx>]

Hi,

nice to see that the new file format is shaping up now. Some comments
from my side:

* I do not see anything related to SPICE in this document. I would vote
to add it including the possibility to embedded spice models
(BASE64-encoded) into the symbol itself.

* pin type as it is currently specified should be removed. Instead it
should be replaced with a more powerful electrical constraints
specification entity which includes the pin type, but allows the
addition of various other constrains as well, like:
  - output-voltage-range
  - voltage range for valid high/low signal
  - net/bus-type (e.g. I2C/SDA,...)
  - electrical hypergraph (to detect invalid connections between
galvanic separated net-groups)
  - ...

* specifying diff-pair in symbol itself without relying on a naming
convention?

* How are power symbols defined now?

Regards,
Thomas

Am 01.01.19 um 20:59 schrieb Wayne Stambaugh:
> 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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