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:
Jan. 06, 1998
Filed:
Nov. 12, 1996
David Mark Kalish, Laguna Niguel, CA (US);
Russell Lee Marrash, Irvine, CA (US);
Gary Carl Whitlock, Mission Viejo, CA (US);
Kha Nguyen, Anaheim, CA (US);
Unisys Corporation, Blue Bell, PA (US);
Abstract
An arbitration logic system in a system control module regulates access to a common system bus as provided by a state machine which toggles access priority between two or more resource modules while preventing deadlock contention between two requesting modules while insuring that no module will be starved or denied access even though all the resource modules are contending for bus access. Any continuous deprivation or starvation of a module for bus access is prevented, in addition to any deadlock situations which are also prevented. This occurs by allowing retrying modules to request the bus at a temporarily higher priority and limiting the number of retries that any given requesting module is permitted to have.