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Reconfigurable Spike Routing Architectures for On-Chip Local Learning in Neuromorphic Systems

Title
Reconfigurable Spike Routing Architectures for On-Chip Local Learning in Neuromorphic Systems
Author
정두석
Keywords
LUT-based routing scheme; neuromorphic architecture; neuromorphic system; on-chip learning; spiking neural network
Issue Date
2019-01
Publisher
WILEY
Citation
ADVANCED MATERIALS TECHNOLOGIES, v. 4, Issue 1, NO.1800345
Abstract
Lookup table (LUT)-based spike routing schemes are often used in inference-only neuromorphic systems for their excellent reconfigurability. Yet, the routing in such schemes leaves difficulty in on-chip learning following a local learning rule, which requires a number of synaptic updates upon each spike. In this work, this issue is addressed by investigating four LUT-based routing schemes that use different LUT read-out techniques for on-chip learning. They are random access memory (RAM), content addressable memory, partitioned RAM, and pointer (PTR)-based routing schemes. A theoretical means of evaluating the maximum network size for each scheme without routing congestion-experimentally justified using field-programmable gate array implementations-is first provided. The results indicate that the PTR-based scheme supports a neuromorphic core consisting of 20 000 neurons (simultaneously firing at 50 Hz) and 2 million synapses at 200 MHz clock speed with minimum circuit overhead. The PTR-based scheme is further applied to multiple cores in a large-scale neuromorphic cluster, revealing that the cluster can theoretically hold 1.81 million neurons (simultaneously firing at 50 Hz) and 362 million synapses at 100 MHz global clock speed (separate clock for global event routing) when all cores operate at 200 MHz local clock speed (clock for local event routing).
URI
https://onlinelibrary.wiley.com/doi/full/10.1002/admt.201800345http://repository.hanyang.ac.kr/handle/20.500.11754/102982
ISSN
2365-709X
DOI
10.1002/admt.201800345
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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