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Neuromorphic systems have shown improvements over the years, leveraging Spiking neural networks (SNN) event-driven nature to demonstrate low power consumption. As neuromorphic systems require high integration to form a functional silicon brain-like, moving to 3D integrated circuits (3D-ICs) with three-dimensional network on chip (3D-NoC) interconnect is a suitable approach that allows scalable design, shorter connections, and lower power consumption. However, highly dense neuromorphic systems also encounter the reliability issue where a single point of failure can affect the systems'operation. Because neuromorphic systems rely heavily on spike communication, an interruption or violation in the timing of spike communication can adversely affect the performance and accuracy of a neuromorphic system. This paper presents NASH,<sup>a</sup> a fault-tolerant 3D-NoC based neuromorphic system that incorporates as processing elements, lightweight spiking neuron processing cores (SNPCs) with spike-timing-dependent-plasticity (STDP) on-chip learning. Each SNPC houses 256 leaky integrate-and-fire (LIF) neurons and 65k synapses. Evaluation results on MNIST classification, using the fault-tolerant shortest-path K-means-based multicast routing algorithm (FTSP-KMCR), show that the NASH system can maintain high accuracy for up to 30% permanent fault in the interconnect with an acceptable area and power overheads when compared to other existing systems.

On the Design of a Fault-Tolerant Scalable Three Dimensional NoC-Based Digital Neuromorphic System With On-Chip Learning