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:
Oct. 18, 2005
Filed:
Jan. 31, 2002
Honkai Tam, Redwood City, CA (US);
Honkai Tam, Redwood City, CA (US);
Sun Microsystems, Inc., Santa Clara, CA (US);
Abstract
A carry look-ahead adder capable of adding or subtracting two input signals includes first stage logic having a plurality of carry-create and carry-transmit logic circuits each coupled to receive one or more bits of each input signal. Each carry-create circuit generates a novel carry-create signal in response to corresponding first bit-pairings of the input signals, and each carry-transmit circuit generates a novel carry-transmit signal in response to corresponding second bit-pairings of the input signals. The carry-create and carry-transmit signals are combined in carry look-ahead logic to generate accumulated carry-create signals, which are then used to select final sum bits.