Memory system, memory module, and methods of operating the same

A memory system comprising:

• a memory controller;
• a first memory module directly coupled to the memory controller with a point-to-point connection through a first memory bus, the first memory module configured to exchange first data with the memory controller, the first memory module including a plurality of first memory devices;
• and
• second through k-th memory modules coupled to the first memory module with a multi-drop connection through a second memory bus, the second through k-th memory modules configured to exchange second data with the memory controller via the first memory module, each of the second through k-th memory modules including a plurality of second memory devices, k being a natural number greater than two,
• wherein the first memory module has a re-driving mode in which the first memory module re-drives data received from the memory controller to one of the second through k-th memory modules.

A method of operating a memory system including a memory controller, a first memory module directly coupled to the memory controller through a first memory bus and second through k-th memory modules coupled to the first memory module through a second memory bus (k being a natural number greater than two), the method comprising:

• receiving, by the first memory module, write data, a command/address, and a control signal from the memory controller, the command/address and the control signal being associated with the write data;
• storing the write data in one or more memory devices in the first memory module when the first memory module is selected by a chip selection signal in the control signal;
• and
• re-driving the write data, by the first memory module, to be provided to one of the second through k-th memory modules when one of the second through k-th memory modules is selected by the chip selection signal.