| 摘要 |
A refresh address generator includes a refresh address counting unit, a refresh address table, and an address selecting unit. The refresh address counting unit generates a counting signal by performing a counting operation in response to a refresh request signal, outputs at least one bit of the counting signal as an address selection signal, and outputs the remaining bits of the counting signal as a first refresh address. The refresh address table stores a row address of a memory cell having a data retention time shorter than a predetermined time, and outputs, as a second refresh address, the row address stored in a line corresponding to at least some bits of the first refresh address. The address selecting unit selectively outputs the first refresh address provided from the refresh address counting unit or the second refresh address provided from the refresh address table in response to the address selection signal. |
