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:
Jan. 25, 2005
Filed:
Jul. 31, 2003
Kenichi Satori, Tokyo, JP;
Kenichi Satori, Tokyo, JP;
Sony Corporation, , JP;
Abstract
A semiconductor memory device for error correction encoding and decoding able to avoid erroneous judgment occurring due to erroneous correction when a nonvolatile memory is in a predetermined initial state, wherein, at the time of writing, write data and predetermined status data, for example, erasure data when the nonvolatile memory is in an erasure state are compared and, when the result of the comparison is that the write data coincides with the erasure data, the erasure data is selected and, conversely when they do not coincide, the encoded data obtained by error correction encoding the write data is selected and written into the nonvolatile memory, while at the time of reading, when the result of the comparison between the read data and the erasure data from the nonvolatile memory is that the read data coincides with the erasure data, the erasure data is selected and, conversely when they do not coincide, the decoded data obtained by error correction decoding the read data is selected and output.