Tohoku University. Research Profiles


PVT-Variation-Aware VLSI System Based on Nonvolatile-Device/MOS-Hybrid Circuitry



Nonvolatile devices, which can remain stored data without power supply, are generally used for ROM (Read-Only Memory) to store boot programs (the information to start up the computer and the basic instructions that operate it) in computers. One attractive feature is that it does not consume any static power while it remains stored data. ‘Nonvolatile logic' is a novel logic style that a nonvolatile device is used for not only a nonvolatile storage element such as ROM but also a logic-circuit element which is the basic component of a CPU and an entire system. By using the nonvolatile devices as storage elements of circuit-configuration information, we can realize a process-variation- aware logic circuit with small hardware overhead.

Targeted Application(s)/Industry

The proposed technique is effective for implementing high-performance and highly-reliable LSI fabricated with cutting-edge process technology. We expect we can conduct effective collaborative research in highly reliable VLSI-systems fields.


Research Institute of Electrical Communication

HANYU Takahiro , Professor
PhD of Engineering


Related Information

D. Suzuki, et al., “A 71%-Area-Reduced Six-input Nonvolatile Lookup-Table Circuit Using a Three-Terminal Magnetic-Tunnel-Junction-Based Single-Ended Structure,” Japanese Journal of Applied Physics, Vol.52, No.4, pp.04CM04-1-04CM04-6, 2013.

M. Natsui, et al, “Nonvolatile Logic-in-Memory Array Processor in 90nm MTJ/MOS Achieving 75% Leakage Reduction Using Cycle-Based Power Gating,” IEEE Int. Solid-State Circuits Conf. (ISSCC) Dig. Tech. Papers, pp.194-195, 2013.

S. Matsunaga, et al, “A 3.14 μm2 4T-2MTJ-Cell Fully Parallel TCAM Based on Nonvolatile Logic-in-Memory Architecture,” Symposium on VLSI Circuits Digest of Technical Papers, 6-2, pp. 44-45, 2012.