Semiconductor memory device having faulty cells
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United States of America Patent
Stats
-
Apr 14, 2015
Grant Date -
Jul 3, 2014
app pub date -
Aug 6, 2013
filing date -
Feb 29, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A nonvolatile memory apparatus includes a control unit, a main storage medium with an electrically reloadable nonvolatile memory adapted to be operable even when faulty memory cells exist therein, and a storage region storing registered address values of faulty regions of the main storage medium containing the faulty memory cells. Data which is stored in the electrically reloadable nonvolatile memory is divided into blocks, each block having a plurality of data to be administrated and which is assigned an access address by the control unit. An administrative information region is provided in each block. The control unit carries out access requests of the main storage medium and the administration of faulty regions and the number of occurrences of reloading of respective memory cells of the main storage medium.
First Claim
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International Classification(s)
- 2013 Application Filing Year
- G11C Class
- 3958 Applications Filed
- 3772 Patents Issued To-Date
- 95.31 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- G11C Class
- 0 % this patent is cited more than
- 10 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Oct 14, 2026 |
