In block data folding for 3D non-volatile storage
US9569143B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 2015 |
| Grant date | Feb 14, 2017 |
| Priority date | — |
| Expiry date | Dec 11, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2211/5641
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Techniques are disclosed herein for folding data within the same block of memory cells in 3D non-volatile storage. Data is programmed into a first string of memory cells within a block at “n” bits per memory cell. The data is folded to one or more other strings of memory cells in the same block at more than “n” bits per memory cell. For example, the data is folded to a second string at “m” bits per memory cell, where “m”>“n.” The folding operations may be performed in a way to reduce or eliminate program disturb. After the folding operation, the first string may be erased without erasing the folded data. When programming additional data into the first string at “n” bits per memory cell, memory cells on the first string that are associated with word lines for which folded data is stored are not programmed, in one aspect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.