| 摘要 |
A memory system including a flash memory and a programming method thereof are provided to back up an LSB(Least Significant Bit) and to correct or repair a lost LSB. A memory system comprises a flash memory(130) and a memory controller(120). The flash memory stores an LSB and an MSB(Most Significant Bit) in a memory cell. The memory controller includes a buffer memory(121) for temporarily storing the LSB and the MSB and a backup memory for backing up the LSB. The memory controller backs up the LSB stored in the flash memory when a bit program fails, compares the MSB, read from the flash memory, with the MSB, stored in the buffer memory for detecting a fail position, and recovers the LSB stored at the backup memory by referring to the fail position.
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