kicad-developers team mailing list archive

[Simon Richter <Simon.Richter@xxxxxxxxxx>]

Hi,

On 30.06.2015 19:29, Andy Peters wrote:

>> Ideally, I'd like this as attributes on the component pins, and then
>> either inherited directly or at least verified by the ERC.

> One argument against making this a pin attribute rather than a net attribute: FPGA pins can be single-ended or differential depending on the particular design. 

I have an evil plan for that: per-instance configuration options.

In the symbol, I'd like to allow alternative configurations for each
pin, along with dependencies.

This is most useful for connectors, which currently do not take part in
ERC at all (by being declared "passive"); the per-instance configuration
would allow pin types to be assigned without altering the component.

For anything programmable, I/O lines can be narrowed down to "input" or
"output"; I'd also like to give the user the option of using one of
several names for the pin. E.g. if there is a dedicated SPI controller
in the IC, there'd be a configuration "use the SPI controller", which
sets up the pins as MISO (in), MOSI (out), SCLK (out) and CS (out), and
a different configuration "use these pins as I/O", which would set them
as "GPIO1" (bidi), "GPIO2" (bidi) etc., with the option of narrowing
them down further. A differential pair would be another configuration.

   Simon

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