[K-5] Advanced Neuron and AI Systems

[K-5-04] Design of an Energy-Efficient Nonvolatile Lookup Table Circuit Using Active-Load-Localized Circuitry with Self-Terminated Writing/Reading

〇Daisuke Suzuki¹, Takahiro Hanyu² (1. The University of Aizu (Japan), 2. Tohoku University (Japan))

Presentation style: On-site (in-person)

https://doi.org/10.7567/SSDM.2022.K-5-04

An energy-efficient nonvolatile lookup table (LUT) circuit, where both write and read currents are automatically terminated if desired write/read operations are completed, is proposed. The use of self-terminated writing makes it possible to cut off wasted write current by continuously monitoring voltage transition due to the resistance change in the storage element. Moreover, wasted read current can also be cut off by utilizing voltage drop in active-load-localized circuitry as read completion signal. In fact, the proposed 6-input LUT circuit reduces 59% of write energy and 38% read energy with only 5% of hardware overhead compared to those of a conventional circuitry under 45nm CMOS technology.