Device and method with computational memory

A multiply-accumulate (MAC) operation method of a computational IMC memory block physically arranged with a weight memory block so that the blocks form a stack, the MAC operation method comprising:

• transmitting a weight request to the weight memory block through a communication interface providing communication between the weight memory block and the computational IMC memory block, the weight request indicating at least some of weight data of a neural network model stored in memory banks of the weight memory block;
• receiving, through the communication interface, at least some of the weight data based on the weight request from the weight memory block;
• and
• performing a MAC operation between the at least some of the weight data and at least some of input data by using bit cells of a bit cell array of the computational IMC memory block, wherein each bit cell is configured to, while continuously storing a respective same portion of the input data, perform multiplication operations between the respective same portion of the input data continuously stored thereby and different portions of the weight data inputted thereto, wherein the multiplication operations of the bit cells are part of the MAC operation.