Nonvolatile memory device, memory system including the same and method of operating the same

18-19. (canceled)

22-23. (canceled)

A method of operating a nonvolatile memory device including a first memory structure including first through N-th memory dies configured to be connected to an external memory controller via a first channel, where N is a natural number equal to or greater than two, the method comprising:

• performing a data write operation or a data read operation for one of the first through N-th memory dies;
• and
• performing an on-die termination (ODT) operation while the data write operation or the data read operation is performed, the performing the ODT operation including using at least one of the first through N-th memory dies as a first representative die to perform the ODT operation while the data write operation or the data read operation is performed.

25-32. (canceled)