| 摘要 |
PURPOSE: A memory device is provided to implement a read/write operation in a bank group which does not perform a refresh operation by performing the refresh operation according to a bank group through a command. CONSTITUTION: A plurality of bank groups(BG0-BG3) include two or more banks. A plurality of address counter units(110_BG0-110_BG3) correspond to the plurality of bank groups. If a bank group refresh command is applied, the refresh operation of the selected bank group is performed by an address counting of an address counter unit.
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