  Internet-of-Things end-nodes demand low power processing platforms
characterized by heterogeneous dedicated units, controlled by a processor core
running concurrent control threads. Such architecture scheme fits one of the
main target application domain of the RISC-V instruction set. We present an
open-source processing core compliant with RISC-V on the software side and with
the popular Pulpino processor platform on the hardware side, while supporting
interleaved multi-threading for IoT applications. The latter feature is a novel
contribution in this application domain. We report details about the
microarchitecture design along with performance data.
