Memory device performing processing in memory and method of performing processing in memory thereof

A method of performing processing in memory of a memory device, the method comprising:

• setting up one or more processing in memory (PIM) instructions;
• loading first data for a PIM operation from a memory cell array of the memory device based on the one or more PIM instructions;
• and
• performing the PIM operation based on the first data,
• wherein the performing the PIM operation includes:
• performing multiply-accumulation operations on the first data through a plurality of MAC operators in a first stage;
• and
• performing partial sum operations based on result values of the multiply-accumulation operations in a second stage when the multiply-accumulation operations are completed.

A memory device comprising:

• a memory cell array;
• control logic configured to control input and output of data to and from, respectively, the memory cell array;
• and
• a plurality of MAC operators configured to perform multiply-accumulation operations based on data stored in the memory cell array responsive to a MAC operation start signal received from the control logic,
• wherein each of the plurality of MAC operators includes:
• a multiplier configured to perform a multiplication operation using a first MAC input and a second MAC input as operands;
• a first multiplexer configured to output a first operation result of the multiplier or a first partial sum input based on a stage information signal;
• a second multiplexer configured to output a second partial sum input or data stored in an accumulation register based on the stage information signal;
• and
• an adder configured to perform an addition operation on a first output of the first multiplexer and a second output of the second multiplexer.