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:
Nov. 02, 1999
Filed:
Jul. 11, 1997
Applicant:
Inventor:
Roland A Bechade, Somerville, NJ (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
3647365 ; 364788 ;
Abstract
A carry select adder includes an adder for outputting a first sum of values based on a first presumed carry-in of zero and a second sum of the values based on a second presumed carry-in of one. A sum unit produces an actual sum comprising either the first sum or the second sum based on an actual carry-in and simultaneously determines whether the actual sum is all zeros or all ones. The sum unit selects the actual sum and determines whether the actual sum comprises all zeros or ones in the same time period such that there is no significant additional delay associated with the zero/one detection operation.