To solve the problem of fluctuations in clock timing with digital LSIs (also known as the "clock skew" problem), we propose a genetic algorithm (GA) based clock adjustment method that ensures robust clock-timing to cope with fluctuations in the LSI environment such as temperature or power supply voltage. This method is realized by the combination of dedicated adjustable circuitry and adjustment GA software, with the values for multiple adjustable delay circuits inserted into the clock lines being determined by the GA software after fabrication. Experimental results demonstrate that the proposed method can enhance the operational yields of developed test chips while ensuring sufficient timing margins.

This paper describes an automatic multi-objective adjustment system for optical axes using genetic algorithms. It is difficult for conventional systems to automatically adjust optical axes, because it requires high-precision positioning and angle setting with /spl mu/m resolution. Moreover, multiple goals that have a trade-off relation must be satisfied simultaneously by the adjustment. In order to overcome this problem, we propose a multi-objective adjustment system using genetic algorithms. In experiments, simultaneous alignment for the positioning and the angles (parallelism) of optical axes, which is difficult with conventional methods, could be realized within three hours.

Article IXM2: a parallel associative processor Share on Authors: Tetsuya Higuchi Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki, Japan 305 Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki, Japan 305View Profile , Tatsumi Furuya Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki, Japan 305 Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki, Japan 305View Profile , Kenichi Handa Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki, Japan 305 Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki, Japan 305View Profile , Naoto Takahashi University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan 305 University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan 305View Profile , Hiroyasu Nishiyama University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan 305 University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan 305View Profile , Akio Kokubu New Media Development Associate, 1-4-28 Mita, Minato-ku, Tokyo, Japan 108 New Media Development Associate, 1-4-28 Mita, Minato-ku, Tokyo, Japan 108View Profile Authors Info & Claims ISCA '91: Proceedings of the 18th annual international symposium on Computer architectureApril 1991 Pages 22–31https://doi.org/10.1145/115952.115956Online:01 April 1991Publication History 5citation307DownloadsMetricsTotal Citations5Total Downloads307Last 12 Months4Last 6 weeks0 Get Citation AlertsNew Citation Alert added!This alert has been successfully added and will be sent to:You will be notified whenever a record that you have chosen has been cited.To manage your alert preferences, click on the button below.Manage my AlertsNew Citation Alert!Please log in to your account Save to BinderSave to BinderCreate a New BinderNameCancelCreateExport CitationPublisher SiteGet Access