Patents by Inventor Joni N. Chan

Joni N. Chan 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).

  • Method of checking the execution of microcode sequences
    Patent number: 4920538
    Abstract: A global label (path identifier) is stored at compile time which computes a check marker along one permissible execution path of execution of a microinstruction sequence. The remaining execution paths are embedded with scalars and skip microinstructions so that execution along any conditional branch path will always yield the same global label (path identifier). Microcode sequence errors are determined at the completion of each microprogram node execution by comparing a path identifier generated at runtime with the global label stored earlier.
    Type: Grant
    Filed: June 28, 1985
    Date of Patent: April 24, 1990
    Assignee: International Business Machines Corporation
    Inventors: Joni N. Chan, Andrew Moy