Energy Efficient Low Latency Multi-issue Cores for Intelligent Always-On IoT Applications

Joonas Multanen, Heikki Kultala, Kati Tervo, Pekka Jääskeläinen

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Advanced Internet-of-Things applications require control-oriented codes to be executed with low latency for fast responsivity while their advanced signal processing and decision making tasks require computational capabilities. For this context, we propose three multi-issue core designs featuring an exposed datapath architecture with high performance, while retaining energy-efficiency. These features are achieved with exploitation of instruction-level parallelism, fast branching and the use of an instruction register file. With benchmarks in control-flow and signal processing application domains we measured in the best case 64% reduced energy consumption compared to a state-of-the-art RISC core, while consuming less silicon area. A high-performance design point reaches nearly 2.6 GHz operating frequency in the best case, over 2× improvement, while simultaneously achieving a 14% improvement in system energy-delay product.
Original languageEnglish
Pages (from-to)1057–1073
Number of pages17
JournalJournal of Signal Processing Systems
Publication statusPublished - 26 Jul 2020
Publication typeA1 Journal article-refereed

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