EPOCHS-1: A 12 nm Highly Heterogeneous Open-Source SoC With Distributed Coin-Based Power Management and Integrated Hybrid Voltage Regulation

We present EPOCHS-1, a 12 nm, 64 mm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> system-on-chip (SoC) with a high degree of heterogeneity. It features four Linux-SMP-capable RISC-V cores, 14 different types of accelerators, a distributed memory hierarchy, and various peripherals. EPOCHS-1’s memory hierarchy has the flexibility to support a diverse set of accelerators and can scale to support complex applications with 34% and 25% reduction in latency and energy, respectively. A subset of the SoC’s 23 power and 35 clock domains is regulated with a fully-decentralized power-allocation scheme and hybrid unified voltage and frequency scaling (HUVFS) that combines an in-package switched regulator with a per-tile low dropout (LDO). Combined, these techniques achieve up to a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1.57\times $</tex-math> </inline-formula> speedup versus a centralized power management baseline. Designed with an agile methodology, EPOCHS-1 is based on an open-source SoC architecture and features only open-source components, either third-party or newly designed, thus enabling design reuse for future research projects.

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Publication Details

Journal
IEEE Journal of Solid-State Circuits
Published
2025-01-01
DOI
https://doi.org/10.1109/jssc.2025.3602386
Primary Topic
Semiconductor materials and devices
Type
article
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article

EPOCHS-1: A 12 nm Highly Heterogeneous Open-Source SoC With Distributed Coin-Based Power Management and Integrated Hybrid Voltage Regulation

Maico Cassel dos Santos, Kenneth L. Shepard, Thierry Tambe, Pradip Bose et al.
IEEE Journal of Solid-State Circuits
Semiconductor materials and devices
article

EPOCHS-1: A 12 nm Highly Heterogeneous Open-Source SoC With Distributed Coin-Based Power Management and Integrated Hybrid Voltage Regulation

Maico Cassel dos Santos, Kenneth L. Shepard, Thierry Tambe, Pradip Bose, Luca P. Carloni, David Brooks, Davide Giri, Martin Cochet, Gabriele Tombesi, Luca Piccolboni, Gu-Yeon Wei, Noah Sturcken, Alper Buyuktosunoglu, Samira Zaliasl, David Trilla, Erik Jens Loscalzo, Michael Lekas, Aporva Amarnath, John-David Wellman, Ying Jing, Jeff Zhang, Joseph Meyer, Giuseppe Di Guglielmo, Kuan-Lin Chiu, Sarita V. Adve, Paolo Mantovani, S.H.H. Sadeghi, Tianyu Jia, En-Yu Yang, Vignesh Suresh, Joshua Park, Bakshree Mishra, Karthik Swaminathan, J D Zuckerman, S. J. Cahill
article en

Abstract

We present EPOCHS-1, a 12 nm, 64 mm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> system-on-chip (SoC) with a high degree of heterogeneity. It features four Linux-SMP-capable RISC-V cores, 14 different types of accelerators, a distributed memory hierarchy, and various peripherals. EPOCHS-1’s memory hierarchy has the flexibility to support a diverse set of accelerators and can scale to support complex applications with 34% and 25% reduction in latency and energy, respectively. A subset of the SoC’s 23 power and 35 clock domains is regulated with a fully-decentralized power-allocation scheme and hybrid unified voltage and frequency scaling (HUVFS) that combines an in-package switched regulator with a per-tile low dropout (LDO). Combined, these techniques achieve up to a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1.57\times $</tex-math> </inline-formula> speedup versus a centralized power management baseline. Designed with an agile methodology, EPOCHS-1 is based on an open-source SoC architecture and features only open-source components, either third-party or newly designed, thus enabling design reuse for future research projects.

IEEE Journal of Solid-State Circuits
IBM (United States) (US), University of Illinois Urbana-Champaign (US), Harvard University Press (US), Ferric (United States) (US), Columbia University (US)
Openalex Percentile: Top 74%
Semiconductor materials and devices
DOISourceOpenAlex
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