| 摘要 |
PROBLEM TO BE SOLVED: To provide an error correction apparatus configured to properly control write operation and read operation, while minimizing the time required for the write operation and read operation.SOLUTION: A degradation determination circuit 21 determines an erasure time ratio information DR with respect to a reference erasure time BDT of a measured erasure time TD after erasure operation, and obtains a block unit/cell deterioration determination value JC (B), on the basis of the erasure time ratio information DR and block unit/write time information JW (B), according to a determination condition using the erasure time ratio information DR, upper write time ratio information JW1, and lower write time ratio information JW2, as criteria. The block unit/cell deterioration determination value JC(B) is stored in a block unit determination result storage section 36. A general control section 11 controls read operation and write operation with an error correction capability using the block unit/cell deterioration determination value JC(B) as a criterion.SELECTED DRAWING: Figure 9 |
