NDLI: Tightly-Coupled Multi-Layer Topologies for 3-D NoCs

Content Provider	IEEE Xplore Digital Library
Author	Matsutani, H. Koibuchi, M. Amano, H.
Copyright Year	2007
Description	Author affiliation: Keio Univ., Yokohama (Matsutani, H.)
Abstract	Three-dimensional network-on-chip (3-D NoC) is an emerging research topic exploring the network architecture of 3-D ICs that stack several smaller wafers for reducing wire length and wire delay. Although the network topology of 3-D NoC has been explored for a couple of years, there is still only a narrow range of choices. In this paper, we propose a class of 3-D topologies called Xbar-connected network-on-tiers (XNoTs), which consist of multiple network layers tightly connected via crossbar switches. To make the best use of the short delay and high density of inter-wafer links, XNoTs topologies have crossbar switches that connect different layers and their cores. The planar topology on every layer can be independently customized so as to meet the cost-performance requirements, as far as network connectivity is at least guaranteed with the bottom layer. We also propose their routing algorithm, which guarantees deadlock-freedom by restricting the inter-layer packet transfer from a lower-numbered layer to a higher-numbered layer. Path sets at the bottom layer close to the heat sink of the chip can be selectively employed in order to mitigate the heat-dissipation problem of 3-D ICs. Several forms of XNoTs topologies including meshes, tori, and/or trees are created, and they are evaluated in terms of performance, cost, and energy consumption. As a result, we show that even with the flexibilities mentioned above, XNoTs achieve at least as high throughput as existing 3-D topologies for equivalent chip sizes.
Sponsorship	Int. Assoc. Comput. Commun.
Starting Page	75
Ending Page	75
File Size	296925
Page Count	1
File Format	PDF
ISSN	01903918
DOI	10.1109/ICPP.2007.79
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-10
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Network-on-a-chip Network topology Wire Switches Heat sinks Delay Routing System recovery Costs Energy consumption
Content Type	Text
Resource Type	Article

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