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Study on Implementation for Greatly Reducing Power Dissipation of Serial Communication Mechanisms

Research Project

Project/Area Number 15H02254
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Communication/Network engineering
Research InstitutionNational Institute of Informatics

Principal Investigator

YONEDA Tomohiro  国立情報学研究所, アーキテクチャ科学研究系, 教授 (30182851)

Co-Investigator(Kenkyū-buntansha) 羽生 貴弘  東北大学, 電気通信研究所, 教授 (40192702)
今井 雅  弘前大学, 理工学研究科, 教授 (70323665)
吉瀬 謙二  東京工業大学, 情報理工学院, 准教授 (50323887)
齋藤 寛  会津大学, コンピュータ理工学部, 上級准教授 (50361671)
Project Period (FY) 2015-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥42,510,000 (Direct Cost: ¥32,700,000、Indirect Cost: ¥9,810,000)
Fiscal Year 2017: ¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2016: ¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
Fiscal Year 2015: ¥13,130,000 (Direct Cost: ¥10,100,000、Indirect Cost: ¥3,030,000)
Keywords高速シリアル通信 / 細粒度パワーゲーティング / 4値レベル信号 / PLL/DLLレス / 同期/非同期インタフェース / 同期/非同期インタフェース / 通信方式 / シリアル通信 / 低消費電力化 / クロック埋め込み
Outline of Final Research Achievements

This research project proposes a new serial communication scheme where the power consumption of the transmitter and the receiver are reduced to almost 0 for the period when no valid data is transmitted, unlike the conventional serial communication schemes where the embedded clock is always transmitted and the clock and data recovery circuit is continuously working. Since the proposed power reduction can be applied to every invalid word, it achieves a very fine grain power control. In order to evaluate the effectiveness of the proposed scheme, two 10Gbps serial communication circuits based on the proposed and the conventional schemes have been implemented using the same device technology. The experimental results based on the SPICE simulations of those circuits show that the power dissipation of the proposed scheme is greatly reduced compared to that of the conventional scheme when the ratio of the invalid words increases.

Academic Significance and Societal Importance of the Research Achievements

サーバやスーパーコンピュータ等を実現する複数のプロセッサは,互いに通信するためのチップ間高速シリアル通信機構を有している.また,携帯機器でも例えば液晶パネルインタフェースにシリアル通信機構が用いられている.よって,高速シリアル通信機構の低消費電力化を避けては通れないが,現状の電力制御は時間的に荒いレベルで行われているため,頻繁に通信を行っているLSIチップ間やボード間では,電力制御を効果的に行うことは実質的に難しい.提案手法は,他の省電力化手法と組み合わせて使うことが可能で,従来手法で手の届かなかった部分の省電力化が可能であるという意味で,実用上の意義は大きい.

Report

(4 results)
  • 2018 Final Research Report ( PDF )
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • 2015 Annual Research Report
  • Research Products

    (3 results)

All 2018 2016 2015

All Presentation (3 results) (of which Int'l Joint Research: 3 results)

  • [Presentation] Novel Delay Elements for Bundled-Data Transfer Circuits Based on Two-Phase Handshaking Protocols2018

    • Author(s)
      Masashi Imai, Shinichiro Akasaka, Tomohiro Yoneda
    • Organizer
      24th IEEE International Symposium on Asynchronous Circuits and Systems
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Improvement of Line Coding Overhead Targeting Both Run-Length and DC-Balance2016

    • Author(s)
      Sarat Yoowattana, Tomohiro Yoneda
    • Organizer
      IEEE 10th International Symposium on Embedded Multicore/Many-core Systems-on-Chip
    • Place of Presentation
      Lyon Congress Center, Lyon, France
    • Year and Date
      2016-09-21
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A New Encoding Mechanism for Low Power Inter-Chip Serial Communication in Asynchronous Circuits2015

    • Author(s)
      Tomohiro Yoneda, Masashi Imai
    • Organizer
      The 33rd IEEE International Conference on Computer Design
    • Place of Presentation
      New York University, New York City, USA
    • Year and Date
      2015-10-18
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research

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Published: 2015-04-16   Modified: 2020-03-30  

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