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:
Jul. 08, 2014
Filed:
Nov. 18, 2011
Seiji Miura, Hachioji, JP;
Satoru Hanzawa, Hachioji, JP;
Seiji Miura, Hachioji, JP;
Satoru Hanzawa, Hachioji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a phase change memory, when M bit (8 bits=1 byte) data is written, erase operation and program operation are performed in units of n bit (M>n) data. Further, when M bit data is written, program operation is performed in units of the n bit (M>n) data. Further, when M bit data is read from the memory cell, read operation is performed in units of the n bit (M>n) data. For example, when the data is written into to the phase change memory, the data is not overwritten but program is performed after once erasing the target memory cell. The data size for erasure and the data size for program are made equal. Erase and program operation are performed only for the demanded data size.