Memory system, operating method of the memory system, and interface circuit of the memory system

An operating method of a memory system including a buffer chip connected with each of a plurality of non-volatile memories of a memory device, and a memory controller connected with the buffer chip and configured to provide a data strobe signal and a data signal thereto, the operating method comprising:

• performing first monitoring on the data strobe signal, and performing first duty correction on the data strobe signal based on the first monitoring;
• responsive to the first duty correction, performing second monitoring on the data strobe signal, and performing second duty correction on the data strobe signal based on the second monitoring;
• and
• storing first duty correction information and second duty correction information for at least one of the plurality of non-volatile memories based on the first duty correction and the second duty correction, respectively.

An interface circuit of a memory system, the interface circuit configured to connect a memory device including a plurality of non-volatile memories with a memory controller configured to provide a data strobe signal and a data signal to the memory device, the interface circuit comprising:

• a first loop configured to perform first monitoring on the data strobe signal, and perform first duty correction on the data strobe signal based on the first monitoring;
• and
• a second loop configured to, responsive to the first duty correction, perform second monitoring on the data strobe signal, and perform second duty correction on the data strobe signal based on the second monitoring,
• wherein the first loop is configured to be coupled to a data signal sampler included in a buffer chip, and the second loop is configured to be coupled to a multiplexer of the buffer chip, and
• wherein the interface circuit is configured to store first duty correction information and second duty correction information for at least one of the plurality of non-volatile memories based on the first duty correction and the second duty correction, respectively.