kicad-developers team mailing list archive

[Brian Piccioni <brian@xxxxxxxxxxxxxxxxxxxxx>]

Usually, pin swapping is constrained to the same package, so Unit A -> 
Unit B, or inputs of a particular unit. As I understand it, this is 
constrained by the schematic symbol definition.

When I was an engineer, I always had to sign off on a layout, just in 
case the PCB designer did something like what you describe. I'm guessing 
somebody goofed.



On 2022-05-29 4:09 p.m., Kevin Cozens wrote:
> On 2019-12-02 12:52 a.m., Alexander Shuklin wrote:
> > I would say, pin swapping is just will be an another tool (you
> > probably need some specific piece of GUI for that).
>
> Be very careful about how pin swapping is handled. Many years ago 
> someone made a board that could be plugged in to an Amiga 1000 to 
> allow the use of a 68020 CPU in place of the stock 68000.
>
> The board editor swapped a few gates between packages to simplify 
> routing. It didn't take in to account that it was swapping some gates 
> between a regular LS part and an F part. As a result the final board 
> would work properly if you installed one of the LS parts with a low 
> enough propagation delay.