Pad size error for sdram_54tfbga.kicad_mod

[MarcelRobitaille]

Is this footprint supposed to be for the AS4C4M16SA-6BIN? If so, shouldn't the pad diameter be 0.45mm instead of 0.36mm?

[myelin]

The logic is in here: https://github.com/myelin/myelin-kicad.pretty/blob/main/sdram_54tfbga.py

Looking at the comment in there, I'm pretty sure I needed to do at the time (early 2019) to be able to run traces between the balls using JLCPCB's 4 layer process. It's an NSMD footprint, where the pad size is smaller than the ball size. I can't find any notes on the logic I used there, although remember reading about it in a PDF somewhere. Maybe it's linked somewhere in https://github.com/myelin/ElectronFpga though.