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A wide range of Internet of Things (IoT) applications require powerful,energy-efficient and flexible end-nodes to acquire data from multiple sources,process and distill the sensed data through near-sensor data analyticsalgorithms, and transmit it wirelessly. This work presents Arnold: a 0.5 V to0.8 V, 46.83 uW/MHz, 600 MOPS fully programmable RISC-V Microcontroller unit(MCU) fabricated in 22 nm Globalfoundries GF22FDX (GF22FDX) technology, coupledwith a stateof-the-art (SoA) microcontroller to an embedded Field ProgrammableGate Array (FPGA). We demonstrate the flexibility of the System-OnChip (SoC) totackle the challenges of many emerging IoT applications, such as (i)interfacing sensors and accelerators with non-standard interfaces, (ii)performing on-the-fly pre-processing tasks on data streamed from peripherals,and (iii) accelerating near-sensor analytics, encryption, and machine learningtasks. A unique feature of the proposed SoC is the exploitation of body-biasingto reduce leakage power of the embedded FPGA (eFPGA) fabric by up to 18x at 0.5V, achieving SoA state bitstream-retentive sleep power for the eFPGA fabric, aslow as 20.5 uW. The proposed SoC provides 3.4x better performance and 2.9xbetter energy efficiency than other fabricated heterogeneous re-configurableSoCs of the same class.

Arnold: an eFPGA-Augmented RISC-V SoC for Flexible and Low-Power IoT End-Nodes