Research Institute of Electrical Communication Tohoku University


Takahiro Hanyu,Professor

Masanori Natsui,Associate Professor

Naoya Onizawa,Assistant Professor

Daisuke Suzuki,Assistant Professor

Akira Tamakoshi,Research Fellow

(from left) N.Onizawa T.Hanyu M.Natsui D.Suzuki A.Tamakoshi


Research Activities

Very Large-Scaled Integrated (VLSI) processors and their applications to electronics systems, where VLSI processors are used as a “brain“ for intelligent control like human beings, are the key components in the recent information communication technology (ICT) society. In this research division, we explore a path towards a new paradigm VLSI processor beyond brain utilizing novel device technologies and new-paradigm circuit architecture such as logic-in-memory architecture.

Laboratory Web Page

ECEI Web Page

New Paradigm VLSI System(Prof. Hanyu)

We are studying a “new-paradigm VLSI computing” concept that investigates the optimal design through all the VLSI design layers from a device/material design level to an application-oriented algorithm level.“Logic-in-memory VLSI architecture,”where storage elements are distributed over a logic-circuit plane, makes global wires reduced greatly.To implement a logic-in-memory VLSI compactly, we utilize nonvolatile devices such as magnetic tunnel junction (MTJ) devices and focus on other challenging research subjects such as stochastic logic.

Research topics

  • Nonvolatile logic-in-memory VLSI architecture and its application to ultra-low-power VLSI processors
  • Device-model-based new-paradigm VLSI computing architecture
  • Asynchronous-control/multiple-valued data representation-based circuit for a high-performance Network-on-Chip
  • Low-power VLSI design technology based on stochastic logic

New Paradigm VLSI Design (Assoc. Prof. Natsui)

We are studying a new VLSI design paradigm for highly-dependable VLSIs in the nanoscale and post-silicon era. To fully utilize the benefits of technology scaling, we are focusing on PVT-variation-aware VLSI architecture and its applications, self-adaptive system for resilient VLSI, brain-like optimization algorithm and its application to VLSI design methodology, and electronic design automation (EDA) algorithms for Nonvolatile logic-in-memory VLSI.

Research topics

  • PVT-variation-aware VLSI architecture and its applications
  • Self-adaptive system for resilient VLSI
  • Optimization algorithm and its application to VLSI design methodology
  • EDA/CAD algorithms for new paradigm VLSI systems