Memory device, a controller for controlling the same, a memory system including the same, and a method of operating the same

A memory system, comprising:

• a memory device configured to operate in one of a first operation mode and a second operation mode in response to a mode change command, wherein the memory device includes first banks and second banks;
• and
• a controller configured to control the memory device, wherein the controller includes a processing-in-memory (PIM) mode generator configured to generate a mode change command for selecting one of the first and second operation modes,
• wherein the memory device comprises:
• a plurality of pins for receiving a plurality of control signals from the controller;
• a PIM mode controller configured to activate one of the first and second banks in the first operation mode and to activate at least one of the first banks and at least one of the second banks in the second operation mode in response to the mode change command;
• and
• a processing unit configured to perform an operation on first data output from the activated first bank and second data output from the activated second bank.

A method of operating a memory device, the method comprising:

• receiving a mode change request from a controller;
• changing an operation mode of the memory device in response to the mode change request;
• receiving an internal operation request in the changed operation mode;
• and
• performing an operation on data output from at least two activated banks in response to the internal operation request.