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US 2014/0351496 A1Published application
Optimized Configurable NAND Parameters
AssigneeSanDisk Technologies LLC
InventorsChris Avila, Yingda Dong, Man Mui
Life of this patent
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Abstract
Configurable parameters may be used to access NAND flash memory according to schemes that optimize such parameters according to predicted characteristics of memory cells, for example, as a function of certain memory cell device geometry, which may be predicted based on the location of a particular device within a memory array.
Claims16
A method of operating a nonvolatile memory formed in two or more physical levels of memory cells disposed above a substrate comprising:
- determining a first set of parameters to use in accessing a first plurality of memory cells in a first physical level based on at least one memory cell dimension of the first plurality of memory cells;
- determining a second set of parameters to use in accessing a second plurality of memory cells in a second physical level based on the at least one memory cell dimension of the second plurality of memory cells, the second set of parameters including at least one parameter that is different from the first set of parameters;
- subsequently accessing the first plurality of memory cells using the first set of parameters;
- and
- accessing the second plurality of memory cells using the second set of parameters.
2 more elements
A nonvolatile memory system comprising:
- a nonvolatile memory array formed in two or more physical levels of memory cells disposed above a substrate, each memory cell having a memory cell dimension, the memory cell dimension having a pattern of variation from physical level to physical level;
- and
- memory access circuits that access memory cells of the array of memory cells according to access parameters, the memory access circuits having a first set of parameters for accessing a first plurality of memory cells of a first physical level and a second set of parameters for accessing a second plurality of memory cells of a second physical level, the second set of parameters including at least one parameter that is different from the first set of parameters.
Dependencies are inferred from the claim text.