Memory devices for performing multiple write operations and operating methods thereof

An operating method of a memory controller for controlling a memory device, the operating method comprising:

• receiving an initialization request for the memory device from a host;
• in response to the initialization request, generating a multiple write command to together write same initialization data in two or more banks of the memory device;
• transferring the multiple write command to the memory device;
• and
• transferring, to the memory device, a standard write command and an address indicating a position of a bank of the memory device in which data are to be written,
• wherein the multiple write command and the standard write command transferred to the memory device respectively comprise a plurality of fields,
• wherein a first combination of the plurality of fields of the multiple write command is different than a second combination of the plurality of fields of the standard write command.

A memory device comprising:

• a memory cell array including a plurality of banks;
• a command decoder configured to decode a write command and an address received from a memory controller to control a write operation on the plurality of banks;
• and
• a bank controller block configured to select one or more of the plurality of banks in which data is to be written,
• wherein, responsive to the command decoder decoding the write command as a standard write command, the data is written in one bank of the plurality of banks indicated by the address received from the memory controller, and
• wherein, responsive to the command decoder decoding the write command as a multiple write command, the data is together written in two or more banks of the plurality of banks of the memory cell array through an internal bank selecting operation.