研究者詳細 - 渡邊　実

Radiation-hardened optically reconfigurable gate array exploiting holographic memory characteristics 査読

Daisaku Seto, Minoru Watanabe

JAPANESE JOURNAL OF APPLIED PHYSICS 54 ( 9 ) 09MA06-1 - 09MA06-5 2015年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：IOP PUBLISHING LTD

In this paper, we present a proposal for a radiation-hardened optically reconfigurable gate array (ORGA). The ORGA is a type of field programmable gate array (FPGA). The ORGA configuration can be executed by the exploitation of holographic memory characteristics even if 20% of the configuration data are damaged. Moreover, the optoelectronic technology enables the high-speed reconfiguration of the programmable gate array. Such a high-speed reconfiguration can increase the radiation tolerance of its programmable gate array to 9.3 x 10(4) times higher than that of current FPGAs. Through experimentation, this study clarified the configuration dependability using the impulse-noise emulation and highspeed configuration capabilities of the ORGA with corrupt configuration contexts. Moreover, the radiation tolerance of the programmable gate array was confirmed theoretically through probabilistic calculation. (C) 2015 The Japan Society of Applied Physics

DOI： 10.7567/JJAP.54.09MA06

Formation of holographic memory by angle-multiplexing recording in liquid crystal composites 査読

Akifumi Ogiwara, Minoru Watanabe

2015 11th Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2015 3 1 - 2 2015年8月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Institute of Electrical and Electronics Engineers Inc.

Formation of holographic polymer-dispersed liquid crystal (HPDLC) memory for an optically reconfigurable gate array based on the angle-multiplexing recording is discussed by controlling the laser interference exposure in liquid crystal (LC) composites. The successive laser illumination system to record the various configuration contexts at the different region and angle in HPDLC memory is constructed by using the half mirror and photomask placed on the motorized stages under the control of a personal computer (PC). The effect of laser exposure energy on the formation of holographic memory is investigated by the measurement of diffraction intensity during the grating formation process. The reconstruction of configuration contexts for the various logical circuits is demonstrated by the laser illumination at different incident angle in the HPDLC memory.

DOI： 10.1109/CLEOPR.2015.7376567

Holographic scrubbing technique for a programmable gate array 査読

Minoru Watanabe, Takumi Fujimori

2015 NASA/ESA CONFERENCE ON ADAPTIVE HARDWARE AND SYSTEMS (AHS) 1 - 5 2015年6月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：IEEE

Recently, field programmable gate arrays (FPGAs), which have become widely used for embedded systems, have also become anticipated for use in high-radiation environments such as space environments and nuclear power plants. Currently available radiation-hardened FPGAs can support scrubbing techniques, but such techniques entail the difficulty that radiation tolerance is insufficient for high-radiation environments. This paper therefore presents a holographic scrubbing technique for a programmable gate array. The scrubbing period can be less than 10 ns, so the robust ability of programmable gate arrays can be increased drastically. This paper presents theoretical analysis results and a demonstration of high-speed scrubbing on an optically reconfigurable gate array.

DOI： 10.1109/AHS.2015.7231161

High-resolution configuration of optically reconfigurable gate arrays 査読

Radiation-hardened Optically Reconfigurable Gate Array Using a Negative Logic Configuration without a Dedicated VLSI 査読

T. Fujimori, M. Watanabe

24th Annual Single Event Effects (SEE) Symposium 2015年5月

Kouta Akagi, Minoru Watanabe

2015 International Symposium on Next-Generation Electronics (ISNE) 1 - 4 2015年5月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：IEEE

Recently, optically reconfigurable gate arrays (ORGAs) have been developed to offer numerous reconfiguration contexts with high-speed dynamic reconfiguration. Such ORGAs consist of a holographic memory, a laser array, and optically reconfigurable gate array VLSI. The storage capacity of a three-dimensional holographic memory is much higher than that of current two-dimensional memory technologies. Therefore, even Tera-gate-count circuit information can be stored on such a holographic memory. Moreover, high-speed reconfiguration can be realized by exploiting two-dimensional free optical connections between a holographic memory and a photodiode array on an optically reconfigurable gate array VLSI. Such high-speed dynamic reconfiguration can increase the gate array performance. Currently, we are trying to develop a high-density optically reconfigurable gate array VLSI. An important bottleneck is the limitation of light diffraction. This report presents a method of increasing the resolution of diffraction light for realizing a high-density optically reconfigurable gate array

DOI： 10.1109/ISNE.2015.7131967

Design of a parallel-operation-oriented FPGA 査読

Minoru Watanabe

2015 International Symposium on Next-Generation Electronics (ISNE) 1 - 4 2015年5月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：IEEE

Recently, studies of acceleration of software operations on a processor have been executed aggressively using Field Programmable Gate Arrays (FPGAs). However, currently available FPGA architecture presents waste under a parallel operation in terms of configuration memory because the same configuration context corresponding to same-function modules must be programmed onto numerous parts of configuration memory. This paper therefore presents a proposal for a parallel-operation-oriented FPGA architecture including a shared common configuration memory. In this research, a parallel-operation-oriented FPGA with four programmable gate arrays sharing a common configuration memory has been designed using a 0.18 mu m CMOS process technology. The advantage of the parallel-operation-oriented FPGA is clarified and a design technique to achieve a high-performance parallel-operation-oriented FPGA is discussed.

DOI： 10.1109/ISNE.2015.7132021

Total ionizing dose effects of optical components on an optically reconfigurable gate array 査読

Radiation tolerance experiment for a dynamically reconfigurable vision architecture, 査読

M. Watanabe, S. Kawahito

International Journal of Image Processing Techniques 2 ( 1 ) 59 - 62 2015年4月

Retsu Moriwaki, Hiroyuki Ito, Kouta Akagi, Minoru Watanabe, Akifumi Ogiwara

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 9040 393 - 400 2015年3月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Springer Verlag

Recently, optically reconfigurable gate arrays (ORGAs) have been developed as radiation-hardened field programmable gate arrays (FPGAs) to realize a 10 Mrad total ionizing dose-tolerance. Specifically, ORGAs offer important benefits of high-speed reconfiguration, numerous reconfiguration contexts, and robust configuration. These three factors are important to remove the soft-error of a configuration circuit on a programmable gate array and to increase the total ionizing dose tolerance. Although the robust configuration capability has been confirmed using radiation emulation, no actual radiation experiment has been reported to date in the relevant literature. This paper therefore presents experiments demonstrating the enhanced radiation tolerance of an optically reconfigurable gate array using a cobalt-60 gamma radiation source.

DOI： 10.1007/978-3-319-16214-0_35

Parallel-Operation-Oriented Optically Reconfigurable Gate Array 査読

Takumi Fujimori, Minoru Watanabe

ARCHITECTURE OF COMPUTING SYSTEMS - ARCS 2015 9017 3 - 14 2015年3月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：SPRINGER-VERLAG BERLIN

Recently, studies exploring acceleration of software operations on a processor have been undertaken aggressively using field programmable gate arrays (FPGAs). However, currently available FPGA architectures present waste occurring with parallel operation in terms of configuration memory because the same configuration context corresponding to same-function modules must be programmed onto numerous configuration memory parts. Therefore, a parallel-operation-oriented FPGA with a single shared configuration memory for some programmable gate arrays has been proposed. Here, the architecture is applied for optically reconfigurable gate arrays (ORGA). To date, the ORGA architecture has demonstrated that a high-speed dynamic reconfiguration capability can increase the performance of its programmable gate array drastically. Software operations can be accelerated using an ORGA. This paper therefore presents a proposal for combinational architecture of the parallel-operation oriented FPGA architecture and a high-speed reconfiguration ORGA. The architecture is called a parallel-operation-oriented ORGA architecture. For this study, a parallel-operation-oriented ORGA with four programmable gate arrays sharing a common configuration photodiode-array has been designed using 0.18 mu m CMOS process technology. This study clarified the benefits of the parallel-operation-oriented ORGA in comparison with an FPGA having the same gate array structure, produced using the same process technology.

DOI： 10.1007/978-3-319-16086-3_1

Radiation tolerance of optically reconfigurable gate arrays

R. Moriwaki, H. Ito, M. Watanabe, A. Ogiwara, H. Maekawa

International Symposium Toward the Future of Advanced Researches in Shizuoka University 2015年1月

Optically Reconfigurable Gate Array Prototype System

M. Seo, M. Watanabe

The 1st RIS-MJIIT Workshop on Renewable and Sustainable Integrated Systems 2015年

Radiation tolerance experiment for a dynamically reconfigurable vision architecture 査読

M. Watanabe, S. Kawahito

International Conference on Advances in Computing, Electronics and Electrical Technology 1 - 4 2014年12月

Dependable Optically Reconfigurable Gate Array Architecture

Minoru Watanabe

International Symposium on Optical Memory 210 - 211 2014年10月

Image recognition system using an optical Fourier transform on a dynamically reconfigurable vision architecture 査読

Yuki Kamikubo, Minoru Watanabe, Shoji Kawahito

2014 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS) 1528 - 1531 2014年6月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：IEEE

Recently, several varieties of image recognition systems using Fourier transform have been proposed. The salient benefit of using a Fourier transform is its position-independent image recognition capability. However, the operation of Fourier transform of high-resolution images is an extremely heavy operation. This paper therefore presents a proposal of image recognition systems using an optical Fourier transform on a dynamically reconfigurable vision architecture. This proposed system can recognize numerous images within an extremely short period using dynamic reconfiguration.

DOI： 10.1109/ISCAS.2014.6865438

Optically Reconfigurable Gate Array with an Angle-Multiplexed Holographic Memory 査読

A parallel-operation-oriented FPGA architecture 査読

M. Watanabe

International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies 123 - 126 2014年6月

Dependable optically differential reconfigurable gate array 査読

M. Seo, M. Watanabe

International Conference on Space Optical Systems and Applications, CD-ROM (6 pages) 2014年5月

Retsu Moriwaki, Hikaru Maekawa, Akifumi Ogiwara, Minoru Watanabe

GLSVLSI'14: PROCEEDINGS OF THE 2014 GREAT LAKES SYMPOSIUM ON VLSI 341 - 346 2014年5月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：ASSOC COMPUTING MACHINERY

Optically reconfigurable gate arrays (ORGAs) have been developed to achieve a high-performance FPGA with numerous configuration contexts. In the architecture, an optical memory technology or a holographic memory technology has been introduced so that the architecture can have numerous configuration contexts and high-speed reconfiguration capability. Results show that the architecture can achieve a large virtual gate count that is much larger than those of currently available VLSIs. To date, ORGAs with a spatially multiplex holographic memory have been reported. However, the spatially multiplexed holographic memory can only have a small number of configuration contexts, which are limited to about 256 configuration contexts. To implement more than a million configuration contexts, an angle-multiplex holographic memory must be used. However, no ORGA with an angle multiplex holographic memory that can sufficiently exploit the huge storage capacity of a holographic memory has ever been reported. Therefore, this paper presents a proposal of a novel ORGA with an angle-multiplexed holographic memory. The architecture can open the possibility of providing a million configuration contexts for a multi-context FPGA.

DOI： 10.1145/2591513.2591597

Radiation tolerance of color configuration on an optically reconfigurable gate array 査読

Takumi Fujimori, Minoru Watanabe

PROCEEDINGS OF 2014 IEEE INTERNATIONAL PARALLEL & DISTRIBUTED PROCESSING SYMPOSIUM WORKSHOPS (IPDPSW) 205 - 210 2014年5月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：IEEE

Currently, research of optically reconfigurable gate arrays (ORGAs), a type of multi-context field programmable gate arrays (FPGAs), has progressed rapidly. ORGAs offer important benefits of high-speed reconfiguration, numerous reconfiguration contexts, and robust configuration. Such ORGAs always consist of a single-wavelength laser array to address configuration contexts. However, for this architecture, concerns related to its package size often arise. The laser array is large because of the large space between lasers. For that reason, the ORGA also tends to be large. Therefore, we have introduced some wavelength lasers inside a laser array of an ORGA to decrease the laser array size. Results show that the ORGA package can be smaller. However, the dependability of color configuration has never been discussed up to now. This paper therefore presents a demonstration of the radiation tolerance of color configuration on an optically reconfigurable gate array.

DOI： 10.1109/IPDPSW.2014.27

Enhanced radiation tolerance of an optically reconfigurable gate array by exploiting an inversion/non-inversion implementation 査読

Takashi Yoza, Minoru Watanabe

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 8405 156 - 166 2014年4月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Springer Verlag

To date, optically reconfigurable gate arrays (ORGAs) have been developed to realize highly dependable embedded systems. ORGAs present many beneficial capabilities beyond those of field programmable gate arrays (FPGAs): The most important is that an ORGA can be reconfigured using an error-included configuration context that has been damaged by high-energy charged particles. The radiation tolerance of an ORGA is extremely high. Moreover, if an inversion/ non-inversion implementation architecture is introduced to an ORGA, the configuration dependability of the ORGA for radiation can be increased drastically. This paper therefore presents a demonstration of the enhanced radiation tolerance of an optically reconfigurable gate array achieved by exploiting the inversion/ non-inversion implementation. © 2014 Springer International Publishing Switzerland.

DOI： 10.1007/978-3-319-05960-0_14