A memory system is provided which includes multiple semiconductor memories having arrays of memory cells and a memory controller configured to provide an address in common to the multiple memories. First and second addresses corresponding to first and second rows of memory cells in first and second memories are selected according to the address in common. The first row and its adjacent rows in the first memory can all be different from the second row and its adjacent rows in the second semiconductor memory. Different conversion schemes can provide scramble information used to convert the address in common into the first and second addresses.