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:
Feb. 21, 1995
Kazumasa Hamaguchi, Kawasaki, JP;
Shigeki Shibayama, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In a multiprocessor system having a shared memory containing the state of the data for every entry in each cache memory possessed by each processor. The state of the data is set to a 'shared state' when the data is shared with other cache memories, and is set to a 'shared stale state' when the data in the 'shared state' becomes stale by updating performed in another cache memory. Each processor monitors a transaction generated on a bus, derives a data portion from the bus when it is in the same address as the data in the 'shared stale state' of its own cache memory, thereby updating the data in the address and making the state of the data a 'shared state'.