| 摘要 |
An access count device and the like in a semiconductor memory are disclosed, which count accesses to row addresses in the semiconductor memory with a smaller circuit scale. An access count device includes a row-address storage unit configured to store up to a specific number n (n is an integer equal to or more than 1) of row addresses specified in accesses to memory cells, a counter configured to count an access frequency to each row address stored in the row-address storage unit, and a reset controller configured to notify the row-address storage unit to replace one of the n row addresses with a new row address or discard one of the n row addresses, and also configured to notify the counter to reset an access frequency to the row address replaced or discarded. |
