Die Shots of the Raspberry Pi RP2040
From the twitter thread, someone said it was fabbed by TSMC at 40nm.I wonder, with the cutting edge moving to smaller and smaller processes (5nm, etc)... how much of the older/larger capacity can be reused? Meaning, are we about to see a ton of cheaper chips like this RP2040 that are using older/slower/obsolete fab capacity? Or is the same equipment able to be used across a family of process sizes?In other words, once TSMC has X amount of capacity on 40nm, is that capacity always around and fixed to 40nm? If so, I imagine that creating new chips that don't need to be super fast will just become super cheap.