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  • 1.
    Lu, Zhonghai
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Tong, Li
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Yin, Bei
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Jantsch, Axel
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    A power efficient flit-admission scheme for wormhole-switched networks on chip2005In: WMSCI 2005: 9th World Multi-Conference on Systemics, Cybernetics and Informatics, Vol 4 / [ed] Callaos, N; Lesso, W; Palesi, M, 2005, p. 25-30Conference paper (Refereed)
    Abstract [en]

    Reducing power consumption is a main challenge when adopting a network as a global on-chip communication interconnect since the reduction in power dissipation should not at the expense of degrading the system performance. We investigate power in a wormhole-switched network with focus on the impact of flit-admission schemes, i.e., when and how the flits of packets are admitted into the network We have proposed a novel flit-admission scheme that shows significant shrink of the switch complexity while maintaining equivalent network performance. This paper investigates its influence in network power involving both switches and links. We conduct experiments on a 2D mesh network. The results show that our flit-admission scheme achieves significant power and area reduction without performance penalty. To our knowledge, our work is the first study of power dissipation on flit admission schemes.

  • 2.
    Lu, Zhonghai
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Yin, Bei
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Jantsch, Axel
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Connection-oriented multicasting in wormhole-switched networks on chip2006In: IEEE Computer Society Annual Symposium on VLSI, Proceedings - EMERGING VLSI TECHNOLOGIES AND ARCHITECTURES, 2006, p. 205-210Conference paper (Refereed)
    Abstract [en]

    Network-on-Chip (NoC) proposes networks to replace buses as a scalable global communication interconnect for future SoC designs. However, a bus is very efficient in broadcasting. As the system size scales up to explore the chip capacity, broadcasting in NoCs must be efficiently supported. This paper presents a novel multicast scheme in wormhole-switched NoCs. By this scheme, a multicast procedure consists of establishment, communication and release phase. A multicast group can request to reserve virtual channels during establishment and has priority on arbitration of link bandwidth. This multicasting method has been effectively implemented in a mesh network with dead-lock freedom. Our experiments show that the multicast technique improves throughput, and does not exhibit significant impact on unicast performance in a network with mixed unicast and multicast traffic if the network is not saturated.

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