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:
Apr. 11, 2000
Filed:
Aug. 27, 1997
Ravi Kumar Kolagotla, Breinigsville, PA (US);
Mohit Kishore Prasad, Bethlehem, PA (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
In accordance with the present invention, an address arithmetic unit provides a modulo addressing technique for addressing memory locations in a circular buffer. The address arithmetic unit includes a sign detector adapted to determine whether a sum of an address pointer and a precomputed comparison term is of a first state or a second state. A first adder adds an address pointer and a precomputed correction term to generate a first potential next address pointer. A second adder, operating in parallel with the first adder, adds the address pointer and a displacement to generate a second potential next address pointer. A selector adapted to select the first potential next address pointer as an output when the sign detector output and a sign bit of the displacement are different, and to select the second potential next address pointer as an output when the sign detector output and a sign bit of the displacement are the same.