MANIC: A $19\mu\mathrm{W}$ @ 4MHz, 256 MOPS/mW, RISC-V microcontroller with embedded MRAM main memory and vector-dataflow co-processor in 22nm bulk finFET CMOS.
Graham Gobieski, Oguz Atli, Cagri Erbagci, Ken Mai, Nathan Beckmann, Brandon Lucia
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