Sandisk Technologies Inc.

Siddarth Naga Murty Bassa

YenLung Li

Hua-Ling Cynthia Hsu

Chen Chen

Jeongduk Sohn

For a non-volatile memory that uses hard bit and soft bit data in error correction operations, to reduce the amount of soft bit data that needs to be transferred from a memory to the controller and improve memory system performance, the soft bit data can be compressed before transfer. After the soft bit data is read and stored into the internal data latches associated with the sense amplifiers, it is compressed within these internal data latches. The compressed soft bit data can then be transferred to the transfer data latches of a cache buffer, where the compressed soft bit data can be consolidated and transferred out over an input-output interface. Within the input-output interface, the compressed data can be reshuffled to put into logical user data order if needed.

Use of data latches for plane level compression of soft bit data in non-volatile memories

An apparatus includes a control circuit that is configured to connect to an array of non-volatile memory cells. The control circuit includes a first plurality of data latches configured to connect to non-volatile memory cells of a first plane and a second plurality of data latches configured to connect to non-volatile memory cells of a second plane. The control circuit also includes a shared data transfer data latch configured for transfer of data with the first plurality of data latches and the second plurality of data latches.

Non-volatile memory with shared data transfer latches

On-the-fly multiplexing scheme for compressed soft bit data in non-volatile memories

An apparatus includes nonvolatile memory cells arranged in columns including a plurality of redundant columns with control circuits coupled to the nonvolatile memory cells. The control circuits are configured to maintain an ordered list of bad columns replaced by redundant columns. The control circuits are configured to detect an out-of-order entry in the ordered list of bad columns replaced by redundant columns.

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San Jose, CA, United States of America

Siddarth Naga Murty Bassa