作者
Michael Gautschi, Pasquale Davide Schiavone, Andreas Traber, Igor Loi, Antonio Pullini, Davide Rossi, Eric Flamand, Frank K Gürkaynak, Luca Benini
发表日期
2017/2/24
期刊
IEEE transactions on very large scale integration (VLSI) systems
卷号
25
期号
10
页码范围
2700-2713
出版商
IEEE
简介
Endpoint devices for Internet-of-Things not only need to work under extremely tight power envelope of a few milliwatts, but also need to be flexible in their computing capabilities, from a few kOPS to GOPS. Near-threshold (NT) operation can achieve higher energy efficiency, and the performance scalability can be gained through parallelism. In this paper, we describe the design of an open-source RISC-V processor core specifically designed for NT operation in tightly coupled multicore clusters. We introduce instruction extensions and microarchitectural optimizations to increase the computational density and to minimize the pressure toward the shared-memory hierarchy. For typical data-intensive sensor processing workloads, the proposed core is, on average, 3.5× faster and 3.2× more energy efficient, thanks to a smart L0 buffer to reduce cache access contentions and support for compressed instructions. Single …
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M Gautschi, PD Schiavone, A Traber, I Loi, A Pullini… - IEEE transactions on very large scale integration (VLSI) …, 2017