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. 14, 1999
Filed:
Feb. 21, 1997
Roland A Bechade, Somerville, NJ (US);
International Business Machines Corp., Armonk, NY (US);
Abstract
A carry select adder including a two level carry selector connected to multiple carry chains. Two or more adders produce at least two pairs of candidate carry-out signals in parallel. For each pair, a first candidate carry-out signal is based on a first presumed carry-in signal and a second candidate carry-out signal is based on a second presumed carry-in signal different than the first presumed carry-in signal. A two-level selector for simultaneously selects, for each of the pairs of candidate carry-out signals, either the first candidate carry-out signal or the second candidate carry-out signal as an actual carry-out signal, based on an actual carry-in signal. Both selected carry out signals are passed to.