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. 29, 2015
Filed:
Apr. 01, 2010
James L. Ball, Santa Cruz, CA (US);
James R. Lawson, San Jose, CA (US);
James L. Ball, Santa Cruz, CA (US);
James R. Lawson, San Jose, CA (US);
ALTERA CORPORATION, San Jose, CA (US);
Abstract
Methods and apparatus are provided for implementing circuitry operable to perform barrel shifting, multiplication, and rotation operations in hard coded logic on a programmable chip. A hard coded multiplier is augmented using multiplexer circuitry, a logical operation, and a bypassable 2^N functional block. Based on control signals, the multiplexer circuitry can be used to select a rotation, multiplication, or barrel shifted output. Multiplexer control signals also provide sign information associated with operands passed to the multiplier. A single augmented multiplier can perform barrel shifting, rotation, or multiplication operations. Inputs of a multiplier can also be selectively grounded to allow the multiplier to perform logic operations.