Energy Efficient Approximate Storing of Image Data for MTJ Based Non-volatile Memory

Yoshinori Ono, Kimiyoshi Usami

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

A non-volatile memory (NVM) employing MTJ has a lot of strong points such as read/write performance, best endurance and operating-voltage compatibility with standard CMOS. However, it consumes a lot of energy when writing the data. This becomes an obstacle when applying to battery-operated mobile devices. To solve this problem, we propose an approach to augment the capability of the precision scaling technique for the write operation in NVM. Precision scaling is an approximate computing technique to reduce the bit width of data (i.e. precision) for energy reduction. When writing image data to NVM with the precision scaling, the write energy and the image quality are changed according to the write time and the target bit range. We propose an energy-efficient approximate storing scheme for NVM that allows us to write the data by optimizing the bit positions to split the data and the write time for each bit range. By using the statistical model, we obtained optimal values for the write time and the targeted bit range under the trade-off between the write energy reduction and image quality degradation. Simulation results have demonstrated that by using these optimal values the write energy can be reduced by 25-50% while maintaining the acceptable image quality. In addition, we evaluated the energy benefits when applying our approach to three types of image processing. Results showed that the write energy is reduced by further 17% at the maximum.

本文言語English
ホスト出版物のタイトルProceedings - 9th IEEE Non-Volatile Memory Systems and Applications Symposium, NVMSA 2020
出版社Institute of Electrical and Electronics Engineers Inc.
ISBN(電子版)9781728184821
DOI
出版ステータスPublished - 2020 8
イベント9th IEEE Non-Volatile Memory Systems and Applications Symposium, NVMSA 2020 - Virtual, Seoul, Korea, Republic of
継続期間: 2020 8 192020 8 21

出版物シリーズ

名前Proceedings - 9th IEEE Non-Volatile Memory Systems and Applications Symposium, NVMSA 2020

Conference

Conference9th IEEE Non-Volatile Memory Systems and Applications Symposium, NVMSA 2020
国/地域Korea, Republic of
CityVirtual, Seoul
Period20/8/1920/8/21

ASJC Scopus subject areas

  • ハードウェアとアーキテクチャ

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