Patent ID: 7830742

Claim:
A method for accessing a memory cell of a semiconductor memory device, the method comprising: receiving an input address; determining whether the input address has been accessed at least a predetermined number of times; and converting a position of the memory cell enabled by the input address when it is determined that the input address has been accessed the predetermined number of times or more, wherein: determining of whether the input address has been accessed the predetermined number of times or more includes: storing a previously input address in a register of the semiconductor memory device as a stored address, determining whether the input address is the same as the stored address, and increasing or decreasing a counter when the input address is the same as the stored address; and when the counter indicates that the input address has been accessed the predetermined number of times or more, the semiconductor memory device converts the position of the memory cell enabled by the input address from a position of a first memory cell to a position of a second memory cell.