Western Digital Technologies, Inc.

Sandisk Technologies Inc.

Mostafa El Gamal

James Fitzpatrick

Richard David Barndt

Niranjay Ravindran

Bernardo Rub

Henry Chin

Ravi J Kumar

Bernie Rub

Jim Fitzpatrick

Disclosed are systems and methods for providing programming of multi-level memory cells using an optimized multiphase mapping with a balanced Gray code. A method includes programming, in a first phase, a first portion of data into memory cells in a first-level cell mode. The method may also include reading, from the memory cells, the programmed first portion of the data. The method may also include programming, in a second phase, a second portion of the data into the memory cells in a second-level cell mode, wherein programming the second phase is based on applying, to the read first portion of the data, a mapping from the first-level cell mode to the second-level cell mode. The mapping may be selected based on minimizing an average voltage change of the memory cells from the first to second phase while maintaining a balanced Gray code.

Multi-level cell programming using optimized multiphase mapping with balanced gray code

Storage device programming methods, systems and devices are described. A method may generate a mapping of data based on a set of data, the mapping of data including a first mapped data and a second mapped data. The method may include performing a first programming operation to write, in a first mode, the first mapped data to the memory device. The method may include storing the second mapped data to a cache. The method may include generating a second set of data, based on an inverse mapping of the mapping of data including the second mapped data from the cache and the first mapped data from the memory device, for writing, in a second mode, to the memory device, wherein the second set of data includes the set of data, and the first mode and the second mode correspond to different modes of writing to the memory device.

Mapping for multi-state programming of memory devices

Storage device programming methods, systems and media are described. A method may include encoding data to generate an encoded set of data. A first programming operation may write the encoded set of data to a memory device. The method includes encoding, using a second encoding operation based on the data, to generate a second set of encoded data. The second set of encoded data is stored to a cache. A first decoding operation is performed, based on the second set of encoded data and the encoded set of data, to generate a decoded set of data. A second decoding operation is performed to generate a second decoded set of data. The second decoded set of data is encoded to generate a third set of encoded data. The method includes performing a second programming operation to write the third set of encoded data to the memory device.

Multi-state programming for memory devices

An apparatus includes memory cells programmed to one of a plurality of data states, wherein the memory cells are configured such that the plurality of data states comprise an error-prone data state. Sense circuitry of the apparatus is configured to sense first memory cells programmed to the error-prone data state, determine a bit encoding for the first memory cells, sense other memory cells programmed to other data states, and determine a bit encoding for the other memory cells. A communication circuit of the apparatus is configured to communicate the bit encoding for the other memory cells, the bit encoding for the first memory cells, and an indication that the first memory cells are programmed to the error-prone data state, in response to a single read command from a controller.

Hard and soft bit data from single read

Multi-level cell programming using optimized multiphase mapping with balanced Gray code

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Worcester, MA, United States of America

Mostafa El Gamal