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. 09, 1982
Filed:
Dec. 19, 1979
James E Kocol, Escondido, CA (US);
David B Schuck, Escondido, CA (US);
NCR Corporation, Dayton, OH (US);
Abstract
A self-correcting memory system includes internal error detection and correction circuitry that periodically accesses each data word and a group of ECC check bits associated with each data word stored in the memory system. The error detection and correction circuitry includes an ECC checking circuit that receives the accessed data word, generates ECC bits, and compares those ECC bits to the group of ECC check bits associated with the data word. The resulting signal is used to correct any single bit in error, and to indicate the presence of a double bit error. A self-correct address counter is cascaded to a refresh address counter in the control circuitry of the memory system so that the accessing of each data word occurs during a refresh cycle of the memory system.