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:
Nov. 07, 1989
Filed:
Feb. 17, 1988
Timothy B Brodnax, Arlington, VA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
The parity generation circuit which is disclosed takes advantage of a property of the parity of a number before and after it has been incremented. This is characterized as the parity toggle property and it allows parity generation to be done on the most significant bits of an adder before the carry input to these most significant bits has been generated from the least significant bit portion of the sum produced by the adder. The final parity for the entire sum output of the addition process is adjusted quickly when the carry into the most significant bits of the sum becomes available from the least significant bit portion of the sum output. The parity toggle property of the invention allows for the quick adjustment of the parity without incurring the undue delay of waiting for the production of the carry output from the low order sum before commencing computations with the high order sum.