PULPino or PULPismo ? for a low-power microcontroller

[kgf]

The memory will most probably be your main concern, not really the size of the core. In practice a 32b RISCV-V core is 12 to 50 kGE (without a FPU) in size. This is the area you need for roughly 2 to 8 kbyte of SRAM. So if you are very area constrained, it is more the memory that limits you then anything else.

BTW, Ibex is the 'up to date' version of zero-riscy