Patents by Inventor Derek E. Willams

Derek E. Willams 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).

  • Updating an invalid coherency state in response to snooping an operation
    Patent number: 7743218
    Abstract: A cache coherent data processing system includes at least first and second coherency domains. In a first cache memory within the first coherency domain of the data processing system, a coherency state field associated with a storage location and an address tag is set to a first data-invalid coherency state that indicates that the address tag is valid and that the storage location does not contain valid data.
    Type: Grant
    Filed: August 13, 2008
    Date of Patent: June 22, 2010
    Assignee: International Business Machines Corporation
    Inventors: Guy L. Guthrie, William J. Starke, Jeffrey A. Stuecheli, Derek E. Willams