Patents by Inventor James M. Preston

James M. Preston has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Asic control and data retrieval method and apparatus having an internal collateral test interface function
    Patent number: 5938779
    Abstract: ASIC (Application-Specific Integrated Circuit) testability, troubleshooting access and visibility of internal circuitry are the primary targets of test engineering analysis. The widely applied boundary-scan technique is a useful interface but does not solve all problems connected with the PBA (Printed Board Assembly) manufacturing process. The invention provides an extension of the boundary-scan technique currently implemented to provide improved ASIC testability. The Collateral ASIC Test (method and logic) implemented in a boundary-scan device according to the invention makes possible a test process standardization to ASIC design and testing.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: August 17, 1999
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventor: James M. Preston