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:
Dec. 30, 2008
Filed:
Apr. 04, 2006
Applicant:
Katsunari Suzuki, Yokohama, JP;
Inventor:
Katsunari Suzuki, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F 12/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A multi CPU system is capable of performing exclusive control of a plurality of CPUs accessing to the same resource by a hardware without depending on an OS. The plurality of CPUs are connected with the same system bus. A plurality of circuits one-to-one correspond to each of the plurality of CPUs and comprise respective semaphore acquisition registers. Each of the CPUs in accessing to the resource is controlled, based on the value written in the semaphore acquisition register of the corresponding circuit, the presence or absence of the priority in the semaphore control, and a semaphore signal received from the another circuit.