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Re: Back annotate references from PCB


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.