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US 12,586,657 B2Granted
Nonvolatile memory with temperature-dependent sense time offsets for soft-bit read
AssigneeSanDisk Technologies LLC
InventorsChengqing Hu, Henry Chin
Life of this patent
Estimating the term…
Abstract
Control circuits configured to connect to a plurality of nonvolatile memory cells are configured to perform a soft-bit read of the plurality of nonvolatile memory cells by sensing the plurality of nonvolatile memory cells for a sense-time. The sense-time is obtained by adding a soft-read offset time to a hard-read sense time. The soft-read offset time is dependent on a temperature measurement value such that different soft-read offset times are applied for different temperature measurement values.
Claims20
An apparatus comprising:
- one or more control circuits configured to connect to a plurality of nonvolatile memory cells, wherein the one or more control circuits are configured to:
- perform a soft-bit read of the plurality of nonvolatile memory cells by sensing the plurality of nonvolatile memory cells for a sense time obtained by adding a soft-read offset time to a hard-read sense time, the soft-read offset time is dependent on a temperature measurement value such that different soft-read offset times are applied for different temperature measurement values.
A method comprising:
- performing a hard-read of a plurality of nonvolatile memory cells to obtain hard-read data using a hard-read sense time;
- determining a temperature-dependent soft-read offset time from a temperature measurement value;
- and
- performing a soft-read of the plurality of nonvolatile memory cells to obtain soft-read data using a soft-read sense time that is the sum of the hard-read sense time and the temperature-dependent soft-read offset time.
1 more element
A storage system comprising:
- a plurality of nonvolatile memory cells arranged in NAND strings;
- and
- means for performing a soft-bit read of the plurality of nonvolatile memory cells by sensing the plurality of nonvolatile memory cells for a temperature-dependent sense time obtained by adding a temperature-dependent soft-read offset time to a hard-read sense time, the temperature-dependent soft-read offset time is dependent on a temperature measurement value such that different temperature-dependent soft-read offset times are applied for different temperature measurement values.
Dependencies are inferred from the claim text.