AxNoC: Low-power Approximate Network-on-Chips using Critical-Path Isolation

Akram Ben Ahmed, Daichi Fujiki, Hiroki Matsutani, Michihiro Koibuchi, Hideharu Amano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Citations (Scopus)

Abstract

Various parallel applications, such as numerical convergent computation and multimedia processing, have intrinsic tolerance to inaccuracies that allow soft errors, i.e. bit flips, on a chip. However, existing Network-on-Chips (NoCs) guarantee error-free data transfer; thus, encountering limits to reduce the power consumption. In this context, we propose an approximate dual-voltage NoC, called AxNoC. An AxNoC router uses a per-flit look-ahead power management so that headers and important-data flits are perfectly transferred at a high voltage while the remaining flits may incur bit flips by decreasing the supply voltage. An AxNoC router isolates the critical path when the supply voltage is low since such a critical path is enabled only at high voltage. The critical path isolation enables low-voltage operation to work at the same operating frequency at high voltage. An AxNoC router was implemented using a 28nm process and the evaluation results illustrate its efficiency to reduce the power consumption reaching up to 43% while incurring a small area overhead that does not exceed 6.2%. We also demonstrate that AxNoC exhibits an acceptable accuracy illustrated in a sufficiently small geomean of error.

Original languageEnglish
Title of host publication2018 12th IEEE/ACM International Symposium on Networks-on-Chip, NOCS 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538648933
DOIs
Publication statusPublished - 2018 Oct 26
Event12th IEEE/ACM International Symposium on Networks-on-Chip, NOCS 2018 - Torino, Italy
Duration: 2018 Oct 42018 Oct 5

Publication series

Name2018 12th IEEE/ACM International Symposium on Networks-on-Chip, NOCS 2018

Other

Other12th IEEE/ACM International Symposium on Networks-on-Chip, NOCS 2018
CountryItaly
CityTorino
Period18/10/418/10/5

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture

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