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:
Apr. 23, 2002
Filed:
Feb. 01, 2001
Fujitsu Limited, Kawasaki, JP;
Abstract
This invention is nonvolatile memory that has an ordinary memory cell region wherein ordinary data is stored and an erase information storage memory region wherein the information that shows the status of the erase operation is stored. The erase information storage memory region comprises nonvolatile memory that can store the information even when the power is cut. Preferably, the erase information storage memory region can store erase information in the memory block units in which the erase operation is executed. Further preferably, the erase information storage memory region is able to store erase information for at least the three statuses that are involved in erase operations: erase operation start status, preprogramming end status, and erase operation complete status.