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US 8,942,037 B2Granted
Threshold acquisition and adaption in NAND flash memory
AssigneeLSI Corporation
InventorsHaitao Xia, Fan Zhang, Ming Jin, Shaohua Yang
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Abstract
A method, apparatus, and controller for acquiring and tracking at least one threshold voltage of at least one cell of at least one flash chip. The method can include acquiring the at least one threshold voltage of a particular cell of the at least one flash cell. The method can further include performing at least one threshold voltage adjustment iteration.
Claims20
A method for acquiring and tracking at least one threshold voltage of at least one cell of at least one flash chip, comprising:
- acquiring the at least one threshold voltage of a particular cell of the at least one cell;
- and
- performing at least one threshold voltage adjustment iteration, wherein performing a particular iteration of the at least one threshold voltage adjustment iteration includes:
- updating a particular threshold voltage of the particular cell based upon detecting one or more new read-back voltages.
1 more element
An apparatus, comprising:
- a controller configured for acquiring and tracking at least one threshold voltage of at least one cell of at least one flash chip, the controller further configured for:
- acquiring the at least one threshold voltage of a particular cell of the at least one cell;
- and
- performing at least one threshold voltage adjustment iteration, wherein performing a particular iteration of the at least one threshold voltage adjustment iteration includes:
- writing a known data pattern to a plurality of spare neighbor cells, the plurality of spare neighbor cells being adjacent to the particular cell of the at least one flash chip;
- detecting a plurality of read-back voltages from the plurality of spare neighbor cells;
- and
- adjusting the particular threshold voltage of the particular cell based upon the plurality of read-back voltages of the plurality of spare neighbor cells.
5 more elements
A flash memory system, comprising:
- at least one flash chip;
- and
- a controller configured for acquiring and tracking at least one threshold voltage of at least one cell of the at least one flash chip, the controller further configured for:
- acquiring the at least one threshold voltage of a particular cell of the at least one cell;
- and
- performing at least one threshold voltage adjustment iteration, wherein performing a particular iteration of the at least one threshold voltage adjustment iteration comprises:
- performing a particular iteration of the at least one threshold voltage adjustment iteration upon a determination that an error-correcting code associated with one or more new read-back voltages from the particular cell decodes to the correct data value written to the particular cell.
4 more elements
Dependencies are inferred from the claim text.