| 摘要 |
PURPOSE:To enable to discover improper bit without error in a short time by breaking periodicity and arranging bits at every several memory cells. CONSTITUTION:After 10 memory cells 1 are arranged, i.e., after 10Xamum isolated, 10 cells are again arranged in column at an interval of Amum (which is different from amum), are then arranged again at Amum, and are repeated until reaching necessary number. Memory cells are similarly arranged also in rows. In this manner, in case, for example, of 57-th rows, it is not counted sequentially from the first one by one, but it is counted from the fifth interval of Amum to seventh memory cell. Thus, even if it is counted under microscope, it does not take a plenty of time, and it does not mistake. |
