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:
Nov. 13, 1990
Filed:
Feb. 15, 1989
Philippe Gallay, Brignoud, FR;
Eric Depret, Caen, FR;
Etat Francais represente par le Ministre des Postes, Issy-Les Moulineaux, FR;
Abstract
A multiplier for two binary values, X and Y, comprising a very high number (q) of bits, wherein memories storing the numbers X and Y and a result register MR are provided, X being expressed as the sequence of bits (x.sub.q-1 . . . x.sub.j . . . x.sub.0), uses the algorithm consisting in sequentially carrying out from j=q-1 to j=0 the additions 2R+x.sub.j Y and each time entering the result in the result memory (MR). In this multiplier the adders are grouped into n blocks of m bits (with n.times.m=q), m being chosen so that the carry transfer time into a block is lower than a clock period. Each block comprises a first and a second line of elementary adders forming the cells (C.sub.1 to C.sub.m+1) associated with each pair of bits to be added. This multiplier is more particularly adapted for carrying out the operations XYmodN and X.sup.S modN.