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Date: Wed, 21 Oct 2015 12:58:34 +0200
From: "Gabriel Paubert (paubert AT iram DOT es) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject: Re: [geda-user] Reduce pinnumber attribute
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On Wed, Oct 21, 2015 at 12:13:48PM +0200, Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
> I assume pinnumber attribute is used to uniquely identify a pin.
> 
> For almost all if not all cases I guess the pinlabel could be used as symbol pin number. If netlister use pinlabel attribute if no pinnumber attribute is available number of attributes could be reduced.
> 
> Are there any disadvantages?

Slotting actually overrides pinnumbers.

And slotting is not obsolete. I don't use it heavily for 
components that provide multiple instances of the same 
function, like 7400 or 7474, but I have started using it
extensively for things like monitoring.

I typically put an ADC to monitor voltages, currents, 
temperatures, PLL voltages and maybe other things. At 
the input of the ADC, there is a multiplexer like an 
ADG731 (32 inputs) which selects the voltage which is 
going to be measured. 

For the multiplexer I have defined two symbols:
- a small, single pin symbol which has 32 slot 
  definitions. Instances of these symbols end up
  being spread all over the design.
- another larger symbol with the rest of the chip
  which typically ends up close to the ADC and 
  either a microcontroller or an FPGA.

    Gabriel