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:
May. 14, 2002
Filed:
Dec. 19, 2000
Yukio Terasaki, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A memory controller which performs a verification of the state of the erased block is performed prior to the writing operation is disclosed. The memory controller according to said present invention further performs a test operation to judge whether the erased block is a defective block to be disposed or not if the erased block is concluded to be not prefer to store data during the verification. In the case where the block is concluded to be a defective block with a permanent error by the test operation, the block is inhibited to use. In the case where the block is concluded to be a defective block with a transient error by the test operation, on the other hand, the block is treated as new erased block.