1. A system for scaling multi-core neurosynaptic networks, comprising: multiple neurosynaptic network circuits, wherein each network circuit comprises a plurality of neurosynaptic core circuits; an interconnect fabric coupling said multiple network circuits; and for each network circuit, at least one corresponding network interface, wherein each network interface for each network circuit enables data exchange between said network circuit and another network circuit of said multiple network circuits by tagging each data packet from said network circuit with corresponding routing information indicating a number of core circuits of said another network circuit that said data packet traverses at least one of horizontally and vertically to reach a target core circuit of said another network circuit; wherein each core circuit comprises multiple electronic neurons, multiple electronic axons, and a plurality of electronic synapse devices for interconnecting said multiple neurons with said multiple axons.