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:
Jun. 13, 1989
Filed:
Jul. 10, 1986
Tobias Noll, Neckartailfingen, DE;
Walter Ulbrich, Puchheim, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
In an arrangement for the bit-parallel addition of binary numbers in two's complement form, a series of adders (AD.sub.i) are provided to receive inputs for binary bits of equivalent significance and to emit intermediate sum and carry words which are combined to form result sum words. For the correction of overflow errors, the carry bit of the adder (AD.sub.n-2) having the second highest significance is replaced by the carry bit of the most significant adder (AD.sub.n-1) and, when the carry bits of the two most significant adders (AD.sub.n-1, AD.sub.n-2) are unequal, the intermediate sum bit of the most significant adder (AD.sub.n-1) is replaced by its carry bit.