Memory system
AssigneeKabushiki Kaisha Toshiba
InventorHaruki TODA
Life of this patent
Estimating the term…
Abstract
A memory system according to the embodiment comprises a cell array including word lines and plural memory cells operative to store data in accordance with plural different physical levels when selected by the word lines; a register operative to hold first data input from external; and a data converter unit operative to convert the first data held in the register into second data and overwrite the second data in the area of the register for holding the first data, and further operative to convert the second data held in the register into third data to be recorded in the memory cells and overwrite the third data in the area of the register for holding the second data.
Claims20
A memory system, comprising:
- a cell array including word lines and plural memory cells operative to store data in accordance with plural different physical levels when selected by said word lines;
- a register operative to hold first data input from external;
- and
- a data converter unit operative to convert the first data held in said register into second data and overwrite the second data in the area of said register for holding the first data, and further operative to convert the second data held in said register into third data to be recorded in said memory cells and overwrite the third data in the area of said register for holding the second data.
A memory system, comprising:
- a cell array including word lines and plural memory cells operative to store data in accordance with plural different physical levels when selected by said word lines;
- a register operative to hold first data input from external;
- and
- a data converter unit operative to convert the first data held in said register into second data and overwrite the second data in the area of said register for holding the first data, and further operative to convert the second data held in said register into third data to be recorded in said memory cells and overwrite the third data in the area of said register for holding the second data,
- wherein said register holds said third data restored based on fourth data read out of said memory cells,
- wherein said data converter unit converts the third data held in said register into said second data and overwrite the second data in the area of said register for holding the third data, and further operative to convert the second data held in said register into said first data to be output to external and overwrite the first data in the area of said register for holding the second data.
A memory system, comprising:
- a cell array including word lines and plural memory cells operative to store data in accordance with plural different physical levels when selected by said word lines;
- a register operative to hold first data input from external;
- and
- a data converter unit operative to convert the first data held in said register into second data and overwrite the second data in the area of said register for holding the first data, and further operative to convert the second data held in said register into third data to be recorded in said memory cells and overwrite the third data in the area of said register for holding the second data,
- wherein said first data is held in said register at every transfer unit composed of certain bits,
- wherein said data converter unit executes conversion processing of said first through third data at every processing unit composed of certain bits,
- wherein a part of the certain transfer unit is subject to conversion processing at a certain processing unit and another part of said certain transfer unit is subject to conversion processing at another processing unit different from said certain transfer unit.
Dependencies are inferred from the claim text.