A scan-chain based state retention methodology for IoT processors operating on intermittent energy

P.A. Hager, H. Fatemi, J.P. de Gyvez, L. Benini

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

6 Citations (Scopus)

Abstract

Future IoT systems are tightly constraint by cost and size and will often be operated from an energy harvester's output. Since these batteryless systems operate on intermittent energy they have to be able to retain their state during the power outages in order to guarantee computation progress. Due to the lack of large energy buffers the state needs to be saved quickly using residual energy only. In related work, the state is retained in-place by replacing all flip-flops with state retentive flip-flops (SRFF), which are powered by auxiliary supplies for retention or incorporate non-volatile memory cells. However, these SRFFs increase the power consumption during active operation impairing the overall systems efficiency. In this paper, we present a scan-chain based state retention approach, where the state is moved to memory using only 4.5pJ/b. Since our approach does not introduce any power overhead, this energy cost pays off after an on-time of just 100us compared to state-of-the-art in-place solutions. Moreover, compared to a software mechanism, our approach requires 6.6x less energy to move the state and is 5.8x faster.

Original languageEnglish
Title of host publicationProceedings of the 2017 Design, Automation and Test in Europe, DATE 2017
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Pages1171-1176
Number of pages6
ISBN (Electronic)978-3-9815-3709-3
DOIs
Publication statusPublished - 11 May 2017
Event20th Design, Automation and Test in Europe Conference (DATE 2017) - Swisstech, Lausanne, Switzerland
Duration: 27 Mar 201731 Mar 2017
Conference number: 20
https://www.date-conference.com/date17/

Conference

Conference20th Design, Automation and Test in Europe Conference (DATE 2017)
Abbreviated titleDATE 2017
CountrySwitzerland
CityLausanne
Period27/03/1731/03/17
Internet address

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