Toshio Arakawa

Title: Innovations of Toshio Arakawa

Introduction

Toshio Arakawa is a prominent inventor based in Kawasaki, Japan. He has made significant contributions to the field of integrated circuit design, holding a total of 4 patents. His work focuses on enhancing the efficiency and functionality of logic circuits, particularly in the context of scan circuits.

Latest Patents

One of his latest patents is a design method for integrated circuits that incorporate a scan function. This invention provides a method for designing LSI that includes a logic circuit equipped with a scan circuit without the need for generating a hard-macro library for the scan flip-flops that make up the scan circuit. The process begins with converting the first netlist into a second netlist by adding the scan circuit, which includes scan flip-flops. The order data for connecting the scan chain is then extracted from this second netlist. Following this, the second netlist is transformed into a third netlist that includes only hard-macros, which is laid out by reordering the scan chain based on the newly generated order data. Ultimately, a fourth netlist is created, which includes the scan circuit formed by soft-macro flip-flops, and this is converted into a fifth netlist by substituting the soft-macro flip-flops for standard cells of hard-macros. The final fifth netlist is laid out without reordering the scan chain.

Another notable patent involves an LSI layout method and apparatus for cell arrangement that prioritizes timing. In this method, automated cell arrangement is performed based on a netlist containing cells and connection data, along with timing conditions. After conducting timing optimization, global wiring processing is implemented, and the wiring congestion rate is analyzed. In regions with high wiring congestion, cell rearrangement processing is executed to facilitate detailed wiring processing. This approach ensures that the overall cell arrangement remains optimized for timing while addressing wiring challenges.

Career Highlights

Toshio Arakawa is currently employed at Fujitsu Corporation, where he continues to innovate in the field of integrated circuit design. His expertise and contributions have made a significant impact on the development of advanced electronic systems.

Collaborations

Throughout his career, Toshio has collaborated with notable colleagues, including Shuji Yoshida and Daisuke Miura. These collaborations have further enriched his work and contributed to the advancement of technology in his field.