The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 2009
Filed:
Jul. 07, 2004
Arthur C. Mckinney, Madison, AL (US);
Charles H. Mccarver, Jr., Huntsville, AL (US);
Vahid Samiee, Austin, TX (US);
Arthur C. McKinney, Madison, AL (US);
Charles H. McCarver, Jr., Huntsville, AL (US);
Vahid Samiee, Austin, TX (US);
Intergraph Hardware Technologies Company, Las Vegas, NV (US);
Abstract
A method for maintaining coherent data in a multiprocessor system having a plurality of processors coupled to main memory, where each processor has an internal cache which is externally unreadable outside the processor. The method includes requesting data associated with a memory location in main memory and determining if an external cache coupled to an application specific integrated circuit associated with a second processor contains a reference to the requested data. A snoop cycle is performed on the second processor if the external cache has a reference to the requested data, whereupon a determination is made as to whether the requested data has been modified.