REPAIRABLE SEMICONDUCTOR MEMORY DEVICE AND REPAIRING METHOD OF THIS SEMICONDUCTOR MEMORY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a repairable semiconductor memory device and a repairing method.

SOLUTION: This semiconductor memory device includes a memory cell array having a first block for preserving first system data and a second block for preserving second system data in the same as the first system data. A controller outputs the first system data to a memory unit in response to a reset signal outputted from a host, and transmits the second system data to the memory unit based on a fail detecting signal generated by an ECC detecting block. The ECC detecting block determines whether or not the first system data is defective data. When a defect is caused in the first system data while resetting the semiconductor memory device, the first system data is repaired by providing the second system data.

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