Can someone please point me to documentation that explains the difference between gf180mcuA gf180mcuB and gf180mcuC ?

@Philipp Gühring: These are defined in the

open_pdks

repository under

gf180mcu/Makefile.in

. The main difference is that A = a 3-metal-layer back-end stack, B = a 4-metal-layer back-end stack, and C = a 5-metal-layer back-end stack. However, the Makefile defines what process options are selected for each of the variants. The only one that Efabless intends to support for MPW runs is the C variant.

Thanks for the explanation!