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:
Oct. 09, 1990
Filed:
Nov. 18, 1988
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An arbiter circuit is disclosed for processing requests made at least two subsystems in a multiprocessor system for access to a resource shared by the subsystems. The arbiter circuit includes an SR flip-flop composed of a pair of NAND gates. The flip-flop is operative in response to a time-staggered request signals from the subsystems to provide a request acknowledging signal to the shared resource. When two request signals are simultaneously supplied to the arbiter circuit, the outputs from the pair of NAND gates tend to stay at an intermediate level between the normal two distincitive logic levels, failing to produce an acknowledgment signal. However, the intermediate level of the NAND gate outputs is sensed by a NOR gate to a trigger a switching device into conduction, by means of which one of the intermediate NAND gate outputs is positively shifted to either of the active logic levels for the generation of an acknowledgement signal to the shared resources. Thus, one of the two subsystems is allowed access to the shared resource.