Systems, Methods, and Devices with Write Optimization in Phase Change Memory

A method of writing phase change memory cells, comprising:

• determining which of a plurality of transformations of data will be most optimal to write to a range of phase change memory cells;
• writing the appropriate transformation of data to said range of phase change memory cells;
• and writing a selection symbol to indicate the transformation of data used;
• wherein said plurality of transformations of data encode substantially identical data.

A method of operating a phase change memory, comprising:

• when data is to be written to an array of phase change memory cells:
• determining which of several transformations of a data chunk is optimal to write;
• determining a write address where the transformed data chunk is to be written to the array of phase change memory cells;
• writing a selection symbol corresponding to the optimal transformation to a data location associated with said step of determining a write address;
• and
• writing the optimal transformation to the array of phase change memory cells at the write address;
• and when data is to be read from an array of phase change memory cells:
• retrieving a read address and a selection symbol corresponding to a data chunk;
• reading the data chunk from the array of phase change memory cells according to the read address;
• using the selection symbol to apply an appropriate inverse transformation to the data chunk, to thereby retrieve a corrected data chunk;
• and
• returning said corrected data chunk.

A method of operating a phase change memory, comprising:

• when data is to be written to an array of phase change memory cells:
• determining which of several transformations of a data chunk is optimal to write;
• determining a write address where the transformed data chunk is to be written to the array of phase change memory cells;
• writing a selection symbol corresponding to the optimal transformation to a data location associated with said step of determining a write address;
• and
• writing the optimal transformation to the array of phase change memory cells at the write address;
• and when data is to be read from an array of phase change memory cells:
• retrieving a read address and a selection symbol corresponding to a data chunk;
• reading the data chunk from the array of phase change memory cells according to the read address;
• using the selection symbol to apply an appropriate inverse transformation to the data chunk, to thereby retrieve a corrected data chunk;
• and
• returning said corrected data chunk;
• wherein said plurality of transformations of data encode substantially identical data.