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. 22, 1994
Filed:
May. 13, 1991
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ;
U.S. Cl.
CPC ...
395725 ; 395325 ; 370 852 ; 3642426 ; 36424292 ; 364240 ; 3642402 ; 364D / ;
Abstract
A method is provided for controlling bus-using rights in a multi-bus system which has a plurality of buses and a plurality of units connected to each of the buses. A unit connected to one bus is accessible by another unit connected to another bus. When a first unit accesses either a second unit on the one bus or a third unit on another bus, two requests for use of the one and another buses are issued substantially at the same time, thereby reducing the time taken for acquiring a bus-using right of the another bus. As soon as it is found that access is directed to the second unit on the one bus, the request for using the another bus is canceled, thus reducing a bus occupation rate for the another bus.