Die Shots of the Raspberry Pi RP2040
From the twitter thread, someone said it was fabbed by TSMC at 40nm.<p>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?<p>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.