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MultiCS: Circuit switched NoC with multiple sub-networks and sub-channels
KTH, School of Information and Communication Technology (ICT), Electronics and Embedded Systems.ORCID iD: 0000-0001-7966-6128
TU Wien, Vienna, Austria.
KTH, School of Information and Communication Technology (ICT), Electronics and Embedded Systems.ORCID iD: 0000-0003-0061-3475
2015 (English)In: Journal of systems architecture, ISSN 1383-7621, E-ISSN 1873-6165Article in journal (Refereed) Published
Abstract [en]

We propose a multi-channel and multi-network circuit switched NoC (MultiCS) with a probe searching setup method to explore different channel partitioning and configuration policies. Our design has a variable number of channels which can be configured either as sub-channels (spatial division multiplexing channels) or sub-networks. Packets can be delivered on an established connection with one or multiple channels. An adaptive channel allocation scheme, which determines a connection width according to the dynamic use of channels, can greatly reduce the delay, compared to a deterministic allocation scheme. However, the latter can offer exact connection width as requested. The benefits and burden of using different number of channels and configurations are studied by analysis and experiments. Our experimental results show that sub-network configurations are superior to sub-channel configurations in delay and throughput, when working at the highest clock frequency of each configuration. Under reasonable channel partitioning, sub-networks with narrow channels can generally achieve higher throughput than the network using single wide channels.

Place, publisher, year, edition, pages
Elsevier, 2015.
Keyword [en]
Circuit switched, Multi-channel, NoC, SDM, Network-on-chip, Switching circuits, Adaptive channel allocation, Channel partitioning, Clock frequency, Multi channel, Multiple channels, Spatial Division Multiplexing, Space division multiple access
National Category
Computer Engineering
URN: urn:nbn:se:kth:diva-175655DOI: 10.1016/j.sysarc.2015.07.013ISI: 000364271900004ScopusID: 2-s2.0-84944148936OAI: diva2:864031

QC 20151023

Available from: 2015-10-23 Created: 2015-10-19 Last updated: 2015-11-30Bibliographically approved
In thesis
1. New circuit switching techniques in on-chip networks
Open this publication in new window or tab >>New circuit switching techniques in on-chip networks
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Network on Chip (NoC) is proposed as a promising technology to address the communication challenges in deep sub-micron era. NoC brings network-based communication into the on-chip environment and tackles the problems like long wire complexities, bandwidth scaling and so on. After more than a decade's evolution and development, there are many NoC architectures and solutions available. Nevertheless, NoCs can be classi_ed into two categories: packet switched NoC and circuit switched NoC. In this thesis, targeting circuit switched NoC, we present our innovations and considerations on circuit switched NoCs in three areas, namely, connection setup method, time division multiplexing (TDM) technology and spatial division multiplexing (SDM) technology.

Connection setup technique deeply inuences the architecture and performance of a circuit switched NoC, since circuit switched NoC requires to set up connections before launching data transfer. We propose a novel parallel probe based method for dynamic distributed connection setup. This setup method on one hand searches all the possible minimal paths in parallel. On the other hand, it also has a mechanism to reduce resource occupation during the path search process by reclaiming redundant paths. With this setup method, connections are more likely to be established because of the exploration on the path diversity.

TDM based NoC constitutes a sub-category of circuit switched NoC. We propose a double time-wheel technique to facilitate a probe based connection setup in TDM NoCs. With this technique, path search algorithms used in connection setup are no longer limited to deterministic routing algorithms. Moreover, the hardware cost can be reduced, since setup requests and data flows can co-exist in one network. Apart from the double time-wheel technique for connection setup, we also propose a highway technique that can enhance the slot utilization during data transfer. This technique can accelerate the transfer of a data flow while maintaining the throughput guarantee and the packet order.

SDM based NoC constitutes another sub-category of circuit switched NoC. SDM NoC can benefit from high clock frequency and simple synchronization efforts. To better support the dynamic connection setup in SDM NoCs, we design a single cycle allocator for channel allocation inside each router. This allocator can guarantee both strong fairness and maximal matching quality. We also build up a circuit switched NoC, which can support multiple channels and multiple networks, to study different ways of organizing channels and setting up connections. Finally, we make a comparison between circuit switched NoC and packet switched NoC. We show the strengths and weaknesses on each of them by analysis and evaluation.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. xvi, 82 p.
TRITA-ICT-ECS AVH, ISSN 1653-6363 ; 2015:18
National Category
Computer Systems
urn:nbn:se:kth:diva-176624 (URN)978-91-7595-727-2 (ISBN)
Public defence
2015-12-04, Sal A, Elektrum, KTH-ICT, Kista, 09:00 (English)

QC 20151109

Available from: 2015-11-09 Created: 2015-11-09 Last updated: 2015-11-09Bibliographically approved

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