MTJ-based asynchronous circuits for Re-initialization free computing against power failures

N. Onizawa, M. Imai, T. Yoneda, T. Hanyu

Research output: Contribution to journalArticlepeer-review

Abstract

This paper introduces CMOS/magnetic tunnel junction (MTJ)-based asynchronous circuits for re-initialization free computing against power failures. The use of MTJ devices can realize continuous operations upon frequent power failures as data being processed are stored with nonvolatility. As asynchronous circuits exploit local control signals instead of a global clock signal, the MTJ-based asynchronous circuits can immediately restart operations after the power supply is recovered without waiting for the calibration time of phase-locked loops used in synchronous circuits. For the safe restore operations, the proposed circuits address issues of metastable states that might occur in the backup phase because of different timings of local control signals. In addition, write-reliable nonvolatile keepers (latches) are introduced in order to reduce write-error rates of MTJ devices for the safe backup operations. To evaluate the performance overheads due to the nonvolatile operations, the proposed asynchronous circuits are designed using TSMC 65 nm CMOS technology and a three-terminal MTJ model and are compared with conventional volatile asynchronous circuits in several benchmarks.

Original languageEnglish
Pages (from-to)46-61
Number of pages16
JournalMicroelectronics Journal
Volume82
DOIs
Publication statusPublished - 2018 Dec

Keywords

  • Energy harvesting
  • Frequent power failures
  • Magnetic tunnel junction
  • Three-terminal MTJ
  • Write-error rate

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering

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