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:
Oct. 20, 1981
Filed:
Oct. 12, 1979
Hitachi, Ltd., Tokyo, JP;
Abstract
In a system which employs SEC-DED codes constituted by data bits added to redundant bits and is capable of detecting and correcting a single bit error while detecting a double or more bit error, detection is made on miscorrection ascribable to a triple bit error. When a single bit error is detected by an error detecting and correcting circuit in the SEC-DED code read out from a memory, all the corrected data bits are inverted in state and rewritten in the memory after having been added to new redundant bits. Subsequently, the data bits together with the redundant bits are read out from the memory and supplied to the error detecting and correcting circuit. The data bits obtained from the error detecting and correcting circuit are compared with the corrected and inverted data bits available before being written in the memory, to thereby determine the presence of an error encompassing more than (m+1) bits on the basis of the result of comparison.