Memory system and operating method thereof

An operating method of a memory system, comprising:

• providing the memory system including a memory controller, a first memory module, a second memory module, a data bus which is shared by the first memory module and the second memory module, a first control bus which is shared by the first memory module and the second memory module, a second control bus for the first memory module and a third control bus for the second memory module;
• determining to perform a backup operation;
• electrically coupling the second control bus to the third control bus;
• controlling the first memory module by the second memory module to read data from one or more volatile memory devices of the first memory module, by using the first control bus and the third control bus which is electrically coupled to the second control bus;
• transferring the data read from the one or more volatile memory devices of the first memory module, to the second memory module through the data bus;
• and
• writing the data transferred through the data bus, in one or more nonvolatile memory devices of the second memory module.

A memory system comprising:

• a memory controller;
• a first memory module including one or more volatile memory devices;
• a second memory module including one or more nonvolatile memory devices;
• a data bus and a first control bus shared by the first and second memory modules and the memory controller;
• a second control bus dedicated for the first memory module and the memory controller;
• a third control bus dedicated for the second memory module and the memory controller;
• and
• a switch array suitable for electrically coupling the second control bus to the third control bus during a backup operation for backing up data of the one or more volatile memory devices to the one or more nonvolatile memory devices, and a recovery operation for recovering the data backed up in the one or more nonvolatile memory devices to the one or more volatile memory devices,
• wherein during the backup operation and the recovery operation, the first memory module operates under control of the second memory module through the first control bus and the third control bus.