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. 21, 1995
Filed:
Mar. 27, 1992
Applicant:
Inventor:
Kiyoshi Fukushima, Kumamoto, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
371 401 ; 371 371 ;
Abstract
A programmable read only memory device comprises a first memory unit for data codes, a second memory unit for parity codes, and an error checking and correction unit for retrieving an original data code from the data code and the associated parity code, wherein a test data code and an improper or proper parity code is supplied from a test data register to the error checking and correction unit so that not only the data checking circuit but also the data correction circuit are examined to see if or not any trouble takes place therein.