Memory system including memory device performing target refresh

A memory system, comprising:

• a memory controller suitable for providing a first target refresh command with a first target address;
• and
• a memory device suitable for performing a target refresh operation on at least one word line corresponding to the first target address according to the first target refresh command, while performing the target refresh operation on at least one word line corresponding to a second target address, which is different from the first target address, according to a second target refresh command,
• wherein the memory controller includes:
• a test module suitable for generating a test command, a test address, and test data during a test operation;
• a refresh control module suitable for receiving the test command and the test address as an active command and an active address, and generating a first target address by sampling the active address according to the active command, during the test operation;
• a command/address generation module suitable for providing the active address together with the active command, and providing the first target refresh command together with the first target address, while determining whether to repair the active address according to a repair control signal;
• and
• a repair analysis module suitable for generating the repair control signal based on a comparison result of the test data and read data from the memory device, during the test operation.

An operation method of a memory system, comprising:

• writing test data on a memory cell array of the memory device;
• applying an aggressive pattern to the memory device;
• generating a first target address by sampling an active address according to an active command, and performing a target refresh operation of the memory device based on the first target address;
• generating a repair control signal based on a comparison result of the test data and read data from the memory device;
• and
• repairing the active address according to the repair control signal.