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. 19, 1978
Filed:
Oct. 29, 1976
John C Schlotterer, Casselberry, FL (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A data processing system includes a shared functional unit having access and egress through a plurality of communication channels to several data handling units. The communication channels are multiplexed under control of a priority selection circuit normally arranged as a ladder from highest to lowest priority. Request signals for the various channels are each passed through a respective gate conditioned by a request enable device which is susceptible of being disabled whenever a select signal for that particular channel has been caused to serve the associated handling unit while channels of lower priority have request signals still demanding selection. When the request signal of lowest order at the time has been served, all request enable devices are reset in order to return to full priority selection.