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:
Mar. 08, 2011
Filed:
Jan. 24, 2007
Yoshiaki Watanabe, Yamanashi, JP;
Yoshiaki Watanabe, Yamanashi, JP;
NEC Computer Techno, Ltd., Kofu-shi, Yamanashi, JP;
Abstract
The multiprocessor system includes multiple cells having identical functions, and each of the multiple cells has a processor, a cache memory, and a main memory. The multiple cells include the first cell as a request cell, the second cell as a home cell, and the third cell as an owner cell. The latest version of the target data stored in the main memory of the second cell is stored in the cache memory of the third cell. When the first cell issues a read request for the target data to the second cell, the second cell issues a snoop request to the third cell in response to the read request. The third cell directly transmits the target data to the first cell in response to the snoop request. Also, the third cell issues the reply write back to the second cell in response to the snoop request. The first cell issues a request write back to the same address as that of the target data in the second cell. The second cell discards the reply write back when the reply write back from the third cell is received later than the request write back from the first cell.