Ibex was born as "Zero-riscy", which had a smaller sibling named "Micro-riscy". https://ieeexplore.ieee.org/document/8106976 gives an indication of power consumption and clock speeds:
"Micro-riscy is 1.6× smaller than Zero-riscy (~11.6 kgates in UMC 65nm), has a power envelope of just 100μW at 160MHz and it is 1.4× more energy efficient than Zero-riscy on pure control code."
Given the renaming, Micro-riscy could well be equivalent to an Ibex with the minimal area "E-extension".
I wish some big name would pick this core and create a line of cheap low-power MCU's from 10 to 100 pins. To my knowledge only Espressif's next chip, after the soon to launch "Chip 7", is known to likely be a RISC-V. Bound to be hugely popular because of low-power, high clocks, code-efficieny, Rust compatibility and a smooth upgrade path. What's not to like?
"Micro-riscy is 1.6× smaller than Zero-riscy (~11.6 kgates in UMC 65nm), has a power envelope of just 100μW at 160MHz and it is 1.4× more energy efficient than Zero-riscy on pure control code."
Given the renaming, Micro-riscy could well be equivalent to an Ibex with the minimal area "E-extension".
I wish some big name would pick this core and create a line of cheap low-power MCU's from 10 to 100 pins. To my knowledge only Espressif's next chip, after the soon to launch "Chip 7", is known to likely be a RISC-V. Bound to be hugely popular because of low-power, high clocks, code-efficieny, Rust compatibility and a smooth upgrade path. What's not to like?