A nonvolatile associative memory-based context-driven search engine using 90 nm CMOS/MTJ-hybrid logic-in-memory architecture

Hooman Jarollahi, Naoya Onizawa, Vincent Gripon, Noboru Sakimura, Tadahiko Sugibayashi, Tetsuo Endoh, Hideo Ohno, Takahiro Hanyu, Warren J. Gross

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

This paper presents algorithm, architecture, and fabrication results of a nonvolatile context-driven search engine that reduces energy consumption as well as computational delay compared to classical hardware and software-based approaches. The proposed architecture stores only associations between items from multiple search fields in the form of binary links, and merges repeated field items to reduce the memory requirements and accesses. The fabricated chip achieves 13.6× memory reduction and 89% energy saving compared to a classical field-based approach in hardware, based on content-addressable memory (CAM). Furthermore, it achieves 8.6× reduced number of clock cycles in performing search operations compared to the CAM, and five orders of magnitude reduced number of clock cycles compared to a fabricated and measured ultra low-power CPU-based counterpart running a classical search algorithm in software. The energy consumption of the proposed architecture is on average three orders of magnitude smaller than that of a software-based approach. A magnetic tunnel junction (MTJ)-based logic-in-memory architecture is presented that allows simple routing and eliminates leakage current in standby using 90 nm CMOS/MTJ-hybrid technologies.

Original languageEnglish
Article number6932498
Pages (from-to)460-474
Number of pages15
JournalIEEE Journal on Emerging and Selected Topics in Circuits and Systems
Volume4
Issue number4
DOIs
Publication statusPublished - 2014 Dec 1

Keywords

  • Associative memory
  • context-driven search
  • logic-in-memory
  • magnetic tunnel junction (MTJ)
  • sparse clustered networks

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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