US Patent 10366050 Multi-operation neural network unit

A neural network unit (NNU) includes N neural processing units (NPU). Each NPU has an arithmetic unit and an accumulator. First and second multiplexed registers of the N NPUs collectively selectively operate as respective first and second N-word rotaters. First and second memories respectively hold rows of N weight/data words and provide the N weight/data words of a row to corresponding ones of the N NPUs. The NPUs selectively perform: multiply-accumulate operations on rows of N weight words and on a row of N data words, using the second N-word rotater; convolution operations on rows of N weight words, using the first N-word rotater, and on rows of N data words, the rows of weight words being a data matrix, and the rows of data words being elements of a convolution kernel; and pooling operations on rows of N weight words, using the first N-word rotater.