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. 16, 1991
Filed:
Jul. 22, 1988
Hitachi, Ltd., Tokyo, JP;
Abstract
Provided is an information processing apparatus in which at least two processing units each having a buffer memory are mutually connected to each other and to a main storage unit through a bus. All of the processing units having the buffer memories continuously monitor the state of the bus. When one of the processing units generates an information updating request in order to update the storage content of the main storage unit, the other processing units read a memory address from the bus. The memory address corresponds to the information to be updated, and is sent to the main storage unit through the bus together with the information updating request. The memory address is compared with memory addresses contained in the buffer memory of the other processing units. If there is a coincidence, information in the relevant memory address exists in its own buffer memory. Thereafter this information is invalidated.