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:
Feb. 17, 1987
Filed:
Sep. 21, 1984
Applicant:
Inventors:
Tomoyuki Ookawa, Kokubunji, JP;
Hiroshi Murayama, Hadano, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi Microcomputer Engineering Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F / ; G06F / ; G06F / ;
U.S. Cl.
CPC ...
364784 ; 364754 ; 364715 ;
Abstract
A sign generation system having a plurality of carry save adders. When adding a sum and a carry generated by a carry save adder in a next stage carry save adder, a full sum of two-bit sign fields adjacent to data fields of the sum and the carry is calculated. The resulting two-bit sign is combined with a constant to generate an exact sign, decreasing number of transferred sign bits.