Controller, memory system, and operating method thereof

An operating method for a controller which controls a nonvolatile memory device, the method comprising:

• transmitting target map data among a plurality of pieces of map data stored in a first memory module to a second memory module;
• determining whether the target map data has locality;
• and
• caching the target map data in the second memory module when the target map data is determined to have the locality.

A memory system comprising:

• a nonvolatile memory device;
• and
• a controller configured to control the nonvolatile memory device,
• wherein the nonvolatile memory device reads a plurality of pieces of map data stored therein and transmits the plurality of pieces of map data to the controller, and
• the controller includes:
• a first memory module configured to store the plurality of pieces of map data read from the nonvolatile memory device;
• and
• a second memory module configured to cache map data having locality among map data received from the first memory module.

An operating method of a memory system which includes a nonvolatile memory device and a controller configured to control the nonvolatile memory device, the method comprising:

• storing a plurality of pieces of map data read from the nonvolatile memory device in a first memory module included in the controller;
• transmitting target map data among the plurality of pieces of map data stored in the first memory module to a second memory module included in the controller;
• determining whether the target map data has locality;
• and
• caching the target map data in the second memory module when the target map data is determined to have the locality.

An operating method of a controller for controlling a memory device storing plural pieces of map data, the operating method comprising:

• caching the map data into a first memory;
• caching, into a second memory, one or more pieces from the map data cached in the first memory;
• accessing the memory device by referring to the map data cached in the second memory;
• and
• accessing the memory device by referring to the map data cached in the first memory upon a cache-miss of the second memory,
• wherein the one or more pieces cached into the second memory have locality.