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:
Apr. 07, 1998
Filed:
Jan. 23, 1997
Joseph Hani Hassoun, Roseville, CA (US);
Michael L Ziegler, Whitinsville, MA (US);
Robert D Odineal, Roseville, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A shared memory multiprocessor computer system in which one or more processor modules and/or input/output modules have cache memories. The main memory controller for each main memory of the system maintains a duplicate cache tag array containing current information on the status of data lines from the main memory that are stored in the cache memories. Thus, coherency checks can be performed directly by the main memory controller. This eliminates the need for each processor having a cache memory to perform a separate coherency check and to communicate the results of its coherency checks to the main memory controller, and thereby reduces delays associated with processing coherent transactions.