Aos: Adaptive Overwrite Scheme For Energy-Efficient Mlc Stt-Ram Cache

Keywords

MLC; Prediction; STT-RAM; Write disturbance

Abstract

Spin-Transfer Torque Random Access Memory (STT-RAM) has been identified as an advantageous candidate for on-chip memory technology due to its high density and ultra low leakage power. Recent research progress in Magnetic Tunneling Junction (MTJ) devices has developed Multi-Level Cell (MLC) STT-RAM to further enhance cell density. To avoid the write disturbance in MLC strategy, data stored in the soft bit must be restored back immediately after the hard bit switching is completed. However, frequent restores are not only unnecessary, but also introduce a significant energy consumption overhead. In this paper, we propose an Adaptive Overwrite Scheme (AOS) which alleviates restoration overhead by intentionally overwriting selected soft bits based on RRD (Read Reuse Distance). Our experimental results show 54.6% reduction in soft bit restoration, delivering 10.8% decrease in overall energy consumption. Moreover, AOS promotes MLC to be a preferable L2 design alternative in terms of energy, area and latency product.

Publication Date

6-5-2016

Publication Title

Proceedings - Design Automation Conference

Volume

05-09-June-2016

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1145/2897937.2897987

Socpus ID

84977139413 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84977139413

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