Neuromorphic architecture

A method of routing signals between neuron circuits of an artificial neural network, the artificial neural network comprising:

• a plurality of neuron circuits, each neuron circuit having at least one input line and at least one output line;
• and a plurality of routing circuits, each routing circuit coupling one or more output lines of one or more of the neuron circuits to one or more input lines of one or more of the neuron circuits, the method comprising:
• programming a first memory cell of a first of the routing circuits, the first memory cell having an input coupled to a first input line of the first routing circuit and an output coupled to a first column line;
• programming a second memory cell of the first routing circuit, the second memory cell having an input coupled to a second input line of the routing circuit and an output coupled to the first column line;
• comparing, by a first comparator circuit, a signal on the first column line with a reference level;
• and
• selectively asserting a signal on a first output line of the routing circuit based on the comparison.