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:
Nov. 27, 2007
Filed:
Nov. 04, 2005
Yoshinobu Yamagami, Nagaokakyo, JP;
Yoshinobu Yamagami, Nagaokakyo, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
There provided a semiconductor memory device which ensures writing to all memory cells regardless of fluctuations in properties of the memory cells caused by manufacturing error or the like and can reduce write operation time and power consumption. Write operations for a memory celland a dummy memory cellare controlled based on a write amplifier control signal WAE. Write operation end timing is determined based on a write completion signal WRST which indicates a storage state of the dummy memory cell. The dummy memory celland peripheral circuitry are designed so that write time required for the dummy memory cellis more than or equal to a maximum of write time required for the memory cells