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.
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