Method for selectively retrieving column redundancy data in memory device
US7966532B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 2009 |
| Grant date | Jun 21, 2011 |
| Priority date | — |
| Expiry date | Dec 1, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C29/82
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Column redundancy data is selectively retrieved in a memory device according to a set of storage elements which is currently being accessed, such as in a read or write operation. The memory device is organized into sets of storage elements such as logical blocks, where column redundancy data is loaded from a non-volatile storage location to a volatile storage location for one or more particular blocks which are being accessed. The volatile storage location need only be large enough to store the current data entries. The size of the set of storage elements for which column redundancy data is concurrently loaded can be configured based on an expected maximum number of defects and a desired repair probability. During a manufacturing lifecycle, the size of the set can be increased as the number of defects is reduced due to improvements in manufacturing processes and materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.