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. 15, 1994
Filed:
Sep. 24, 1992
Applicant:
Inventor:
Masayoshi Hirata, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
36523003 ; 36518901 ; 36518907 ; 365201 ;
Abstract
When an electrically erasable and programmable read only memory device enters a programming mode of operation, write-in data bits are sequentially compared with read-out data bits stored in the memory cells associated with the write-in data bits to see whether or not the write-in data bits are consistent with the read-out data bits, and the programming is carried out in case of inconsistence between the write-in data bits and the read-out data bits; however, if all of the write-in data bits are consistent with the read-out data bits, the write-in data bits are never written into the memory cells so that write-in/erasing characteristics are free from aged deterioration.