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:
Aug. 09, 1988
Filed:
Dec. 27, 1984
Kouichi Yamada, Tokyo, JP;
Masatoshi Mizuno, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A carry circuit used in an arithmetic unit, such as an adder or a subtractor, has to process a carry operation for producing a carry signal to be transferred to the following carry operation stage according to a carry signal transferred from the previous carry operation stage. To process this carry operation at a high speed, an improved carry circuit performs two operations before the carry signal from the previous stage is received. One of the operations is processed by using a signal representing that the carry signal from the previous stage is present. The other operation is processed by using another signal representing that the carry signal from the previous stage is absent. These two operations have been terminated when the carry signal from the previous stage is received. The carry signal from the previous stage is used to select either one of results of the two operations. Thus, transmission of a carry signal to the following stage can be performed at a high speed.