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. 12, 2006
Filed:
Oct. 15, 2002
David Dahan, Pardes Hanna, IL;
Rafi Fried, Caesarea, IL;
David Dahan, Pardes Hanna, IL;
Rafi Fried, Caesarea, IL;
Ceva D.S.P. Ltd., Herzliya, IL;
Abstract
A 3-input adder/subtractor unit, having a first input for receiving a first operand A, a second input for receiving a second operand B, and a third input for receiving a third operand C. An add/subtract unit includes a control input for receiving a user-specified opcode, a first 3-to-2 compressor for receiving a respective least significant bit of said operands or its complement, and a Half Adder coupled to the first 3-to-2 compressor and responsive to an output thereof and to said opcode for outputting a least significant bit of a sum equal to A+B+C or A+B−C or A−B+C or A−B−C. A plurality of 3-to-2 compressors each in respect of remaining bits of the operands receive a respective bit of the operands or its complement, and a 2-input adder coupled to the 3-to-2 compressors receive respective carry and save outputs thereof and computing respective bits of the sum apart from the least significant bit.