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. 09, 1993
Filed:
Mar. 31, 1989
Tetsuya Mochida, Yokohama, JP;
Shigeo Tsujioka, Yokohama, JP;
Masami Jikihara, Yamato, JP;
Hitoshi Sadamitsu, Ashigarakami, JP;
Kazushi Kobayashi, Ebina, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A plurality of process requests generated from processing units, for example, direct memory access (DMA) channels are controlled by a preference circuit in accordance with a priority level assigned to each of the processing unit. An information of the highest priority obtained processing unit and its priority level is stored in latches. Another process requests having the same priority level as the stored processing unit are inhibited from being supplied to the preference circuit, so that the first generated process request is accepted and executed prior to acceptance of the another process requests having the same priority level.