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:
Mar. 25, 1997
Filed:
Feb. 07, 1995
Applicant:
Inventor:
Toshihiro Ishikawa, Yokohama, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ;
U.S. Cl.
CPC ...
364749 ; 39542102 ;
Abstract
A fixed-point arithmetic unit has a calculation controller for detecting number of significant bits of data to be calculated and controlling an adder so as to inhibit it from transferring a carry to a portion of the adder unnecessary for calculation of the significant bits and a register controller for controlling a register adapted to store input and output of the adder such that only the significant bits of data are stored in the register, whereby when the significant bits of data is smaller than a bit width of the arithmetic circuit, consumptive power of the arithmetic unit can be reduced.