Apparatus and method for verifying reliability of data read from memory device through clock modulation, and memory system including the same

A memory system, comprising:

• a memory device including a memory cell region for storing data, the memory device generating a modulation clock by performing a modulation operation on an externally inputted source clock according to a specific scheme, the modulation clock including a plurality of modulation sections, and outputting the modulation clock and read data that are read from the memory cell region in synchronization with the modulation clock;
• and
• a memory controller generating the source clock, outputting the source clock to the memory device, and receiving the read data in response to the modulation clock,
• wherein the read data includes a plurality of section data corresponding to the plurality of modulation sections included in the modulation clock, respectively, and the memory controller verifies reliability of each of the plurality of section data included in the read data by performing a demodulation operation on the modulation signal according to the specific scheme.

A method for operating a memory system including a memory device having a memory cell region for storing data, the method comprising:

• generating a modulation clock by performing a modulation operation on a source clock according to a specific scheme, the modulation clock including a plurality of modulation sections;
• outputting read data that are read from the memory cell region in synchronization with the modulation clock from the memory device, the read data including a plurality of section data corresponding to the plurality of modulation sections included in the modulation clock, respectively;
• and
• verifying reliability of each of the plurality of section data included in the read data by performing a demodulation operation on the modulation signal according to the specific scheme.