@inproceedings{050f4584d2284af893e1dc07c9364f39,
title = "Energy Efficient Write Verify and Retry Scheme for MTJ Based Flip-Flop and Application",
abstract = "A non-volatile flip-flop (NVFF) introducing MTJ has many strong points in high endurance and read/write performance, and hence is very attractive as a component to be used for power gating of sequential circuits. However, large write-energy to MTJ becomes a big obstacle in achieving low energy dissipation. This paper proposes a NVFF circuit enabling to verify the success of a store operation to MTJ and retry it by prolonging the store time. We designed a NVFF circuit with this feature and applied it to 20,000 flip-flops in a dynamically reconfigurable processor (DRP). We conducted simulations considering write time variations caused by various factors such as process variations and thermal fluctuations. The results demonstrated that the proposed approach reduces store energy by 35-36% at four image-processing applications and the break-even time (BET) for non-volatile power gating is 2.0-2.9us at the 0.004% write error rate, at which no failures occur for the total number of NVFFs in the DRP.",
keywords = "MTJ, dynamically reconfigurable processor, non-volatile flip-flop, power gating, process variation, thermal fluctuation, write energy",
author = "Kimiyoshi Usami and Junya Akaike and Sosuke Akiba and Masaru Kudo and Hideharu Amano and Takeharu Ikezoe and Keizo Hiraga and Yusuke Shuto and Kojiro Yagami",
year = "2018",
month = nov,
day = "15",
doi = "10.1109/NVMSA.2018.00023",
language = "English",
series = "Proceedings - 7th IEEE Non-Volatile Memory Systems and Applications Symposium, NVMSA 2018",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "91--98",
booktitle = "Proceedings - 7th IEEE Non-Volatile Memory Systems and Applications Symposium, NVMSA 2018",
note = "7th IEEE Non-Volatile Memory Systems and Applications Symposium, NVMSA 2018 ; Conference date: 28-08-2018 Through 31-08-2018",
}