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:
Jul. 10, 2007
Filed:
Sep. 26, 2000
Tetsuya Yamada, Kodaira, JP;
Motonobu Tonomura, Kodaira, JP;
Fumio Arakawa, Kodaira, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A Sweeney Robertson Tocher (SRT) divider and a square root extractor of floating point double-precision bit width, including a selector of single-precision and double-precision, a carry propagation adder (CPA) for conducting carry propagation of a partial remainder, a quotient digit selector circuit for making selection on a quotient digit, and a selector of a divisor or a partial square root extractor circuit, in a lower side thereof. A selector for selecting the propagation of carry between a carry save adder (CSA) in the upper side and the lower side thereof is provided, and a selector of a starting position within a quotient production circuit is provided, thereby enabling the execution of two (2) calculations, such as, division or square root extraction of the floating point single-precision, at the same time, but without increasing the bit width of a computing unit. Also, with the square root extraction, it is possible to execute two (2) calculations of single-precision in parallel, in a similar manner, by adding a partial square root extraction circuit thereinto.