Storage System and Method for Multi-Cell Mapping
AssigneeWestern Digital Technologies, Inc.
InventorsRan Zamir, Eran Sharon, Idan Alrod
Life of this patent
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Abstract
A storage system has a memory with memory cells that can store a non-power-of-two number of states. A map is used to distribute data bits in the memory. The map can be a modified version of a quadrature amplitude modulation (QAM) map. The mapping can be done by a controller in the storage system or by the memory die. Performing the mapping in the memory die can reduce data traffic between the controller and the memory die, which can provide an improvement to performance and power consumption.
Claims20
A storage system comprising:
- a memory die comprising a plurality of memory cells, each memory cell configured to store a non-power-of-two number of states;
- and
- a controller configured to provide data to the memory die for storage;
- wherein the memory die is configured to:
- determine where to store the data in the plurality of memory cells using a non-power-of-two map;
- and
- write the data into the plurality of memory cells as determined by the map.
In a storage system with a memory die comprising a plurality of memory cells, each memory cell configured to store a non-power-of-two number of levels, a method comprising:
- receiving a plurality of data bits to be stored in the memory die;
- mapping the plurality of data bits to the plurality of memory cells using a non-power-of-two map;
- and
- storing the plurality of data bits in the plurality of memory cells in the memory die according to the mapping.
A storage system comprising:
- a memory die comprising a plurality of memory cells, each memory cell configured to store a non-power-of-two number of states;
- and
- means for mapping a plurality of data bits to the plurality of memory cells using a non-power-of-two map.
Dependencies are inferred from the claim text.