A selective replacement method for timing-error-predicting flip-flops

Yuji Kunitake, Toshinori Sato, Hiroto Yasuura, Takanori Hayashida

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The aggressive technology scaling brings us new challenges, such as parameter variations, soft errors, and device wearout. They increase unreliability of transistors and thus will become a serious problem in SoC designs. The design margin in the supply voltage will be overestimated, which results in large power consumption. To eliminate the waste power consumption due to the overestimated power supply voltage, spatial redundancy is commonly utilized. Based on the spatial redundancy, a lot of dual-sensing flip-flops (FFs) are proposed. These FFs require additional circuits consisting of a redundant FF and a comparator. Thus, they suffer large area overhead. In order to reduce the area overhead, this paper proposes a selective replacement method. We focus our attention on a timing-error-predicting FF, named Canary FF and evaluate the selective replacement method. We apply it to two commercial processors, Toshiba's MeP and Renesas Electronics's M32R. In the case of MeP, the area overhead is reduced from 55% to 11%.

Original languageEnglish
Article number1240013
JournalJournal of Circuits, Systems and Computers
Issue number6
Publication statusPublished - Oct 2012

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture
  • Electrical and Electronic Engineering


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