The Nostrum Backbone - a Communication Protocol Stack for Networks on Chip
VLSID '04 Proceedings of the 17th International Conference on VLSI Design
An Energy-Efficient Reconfigurable Circuit-Switched Network-on-Chip
IPDPS '05 Proceedings of the 19th IEEE International Parallel and Distributed Processing Symposium (IPDPS'05) - Workshop 3 - Volume 04
Spatial division multiplexing: a novel approach for guaranteed throughput on NoCs
CODES+ISSS '05 Proceedings of the 3rd IEEE/ACM/IFIP international conference on Hardware/software codesign and system synthesis
Æthereal Network on Chip: Concepts, Architectures, and Implementations
IEEE Design & Test
Proceedings of the 43rd annual Design Automation Conference
Introducing the SuperGT network-on-chip: SuperGT QoS: more than just GT
Proceedings of the 44th annual Design Automation Conference
IEEE Transactions on Computers
Parallel probing: dynamic and constant time setup procedure in circuit switching NoC
DATE '12 Proceedings of the Conference on Design, Automation and Test in Europe
Analysis and Evaluation of Circuit Switched NoC and Packet Switched NoC
DSD '13 Proceedings of the 2013 Euromicro Conference on Digital System Design
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Although most Network-on-Chip (NoC) designs are based on Packet Switching (PS), the importance of Circuit Switching (CS) should not be underestimated. Many MPSoC executing real-time applications require an underlying communication backbone that can relay messages from one node to another with guaranteed throughput. Compared to PS, CS can provide guaranteed throughput with lower area and power overheads. It is also highly suited for applications where nodes transfer long messages. Spatial Division Multiplexing (SDM) can allow more efficient use of available network resources by dividing them among multiple simultaneous transactions. The network developed by Vali [1] has three design variations based on the number of sub-channels, has a predictable connection setup time, and uses CS to provide guaranteed throughput once a connection is established. In this paper we use this network as a basis to study the effect of flexibility based on SDM, on the performance of a CS networks. A network evaluation platform has been developed to configure and evaluate networks with a maximum of 8 sub-networks, with each subnetwork comprising of 1, 2 or 4 sub-channels. We show that under uniform traffic pattern with requests of uniform random bandwidth (BW) requirement, a less flexible network outperforms a network with higher flexibility due to a phenomenon we call 'stray requests'. We conclude this paper by showing that under high network traffic, performance of our flexible networks can be as much as 113% better than HAGAR [2] and Liu's [3] network.