Arithmetic device

An arithmetic device for a computation in a convolutional layer of a convolutional neural network, the convolutional layer including a plurality of input neurons and a plurality of output neurons each connected to at least one of the plurality of input neurons, the arithmetic device comprising:

• a first register that stores input data as a value of at least one of the plurality of input neurons;
• a plurality of ports;
• and
• a plurality of processing element groups that correspond to the plurality of ports, respectively, and can access the first register through respective corresponding ports, wherein
• each of the processing element groups includes a plurality of processing elements, and each of the processing elements is associated with at least one of the plurality of output neurons and performs a multiply-and-accumulate computation in which a value of at least one input neuron connected to a corresponding output neuron is multiplied by a weight coefficient and a result of multiplication is accumulated.