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:
Sep. 04, 2007
Filed:
May. 31, 2002
Naofumi Takagi, Kyoto, JP;
Naofumi Takagi, Kyoto, JP;
Semiconductor Technology Academic Research Center, Yokohama-shi, JP;
Abstract
A reciprocal square root for a radix ofis calculated when S[j] represents the partial result obtained afteriterations of calculation, W[j], a residual, and P[j], the product of an operand X and the S[j]. Firstly, appropriate values are set to the initial values S[0], W[0], and P[0]. Secondly,iterations of calculations from j=0 to n−1 are performed. One calculation includes selecting a reciprocal square root digit qfrom the digit set {−a, . . . , −1, 0, 1, . . . , a}, and calculating a recurrence equation of the S[j], i.e., S[j+1]:=S[j]+qr, a recurrence equation of the W[j], i.e., W[j+1]:=rW[j]−(2P[j]+Xqr)q, and a recurrence equation of the P[j], i.e., P[j+1]:=P[j]+Xqr.