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:
Oct. 05, 1999
Filed:
Jun. 26, 1997
Applicant:
Inventor:
Kunihiko Nakada, Koganei, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
708491 ;
Abstract
In a microcomputer incorporating a microprocessor, the coprocessor having product-sum operation arithmetic units executes residue multiplications given by 'A=A.multidot.B.multidot.R.sup.-1 mod N+kN', 'A=A.sup.2 .multidot.R.sup.-1 mod N+kN' and 'A=A.multidot.R.sup.-1 mod N 30 kN' and is provided with a multiplication function of executing a preprocessing 'R.sup.2 mod N' at high speed. It is possible to perform a power-residue operation 'X.sup.Y mod N' at high speed by the microprocessor, using these calculation functions of the coprocessor.