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Abstract

A method of determining multi-bit data in a multi-level memory. The method includes setting a source potential of a memory cell to a first source potential, setting a gate potential thereof to a first read-out potential, and determining if bit data of a first digit of multi-bit data is '0' or '1'. Also, the method includes setting the source potential of the memory cell to the first source potential and setting the gate potential thereof to a second read-out potential that is different from the first read-out potential when the bit data of the first digit is '0', and determining if bit data of a second digit of the multi-bit data is '0' or '1'. In addition the method includes setting the source potential of the memory cell to a second source potential different from the first source potential and setting the gate potential thereof to the second read-out potential when the bit data of the first digit is '1', and determining if bit data of the second digit of the multi-bit data is '0' or '1'.

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First Claim