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. 27, 1994
Filed:
Aug. 30, 1991
Howard J Keller, Carlsbad, CA (US);
Christopher E Smith, El Toro, CA (US);
Robert L Noble, Lake Elsinore, CA (US);
Unisys Corporation, Blue Bell, PA (US);
Abstract
An alternate path selection structure is provided which reduces the effects of aborting an operation. The present invention comprises a structure and method that allows efficient retrieval of alternate paths to pursue in a microcode sequence. The present invention is useful in a computer system having a central processing unit, input/output units and a memory unit, each of which include means for generating condition signals indicative of the current status thereof, wherein the central processing unit includes a microsequencer comprising storage means for storing microinstructions for the central processing unit, the input/output units and the memory unit; means for storing the last microinstruction retrieved from the storage means; means for generating an alternate address to the storage means in response to the condition signals; means for producing an abort signal also in response to the condition signals; and, means for selecting either the microinstruction retrieved from the storage means or the last microinstruction in the means for storing in response to the state of the abort signal.