Lecture 9 - Åbo Akademi

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Multi-Wall Carbon Nanotubes (MWCNT) • MWCNTs may have diameters in a wide range varying from a few to hundreds of nanometers • SWCNTs have diameters in the few nanometer range • MWCNT made up of SWCNTs with varying diameters • have many of the properties of SWCNTs • if properly connected to contacts, all MWCNT shells can conduct
Carbon Nanotube Interconnect: Open Problems • Inefficient metal-nanotube contacts • makes propagation delay with CNT interconnects higher than with Cu interconnects • Small MFP length • MFP lengths need to be increased to reduce CNT propagation delay • Density of nanotube bundles • needed for global CNT interconnects that perform better than Cu interconnects • Inductive effects at high frequencies • currently inductive effects are ignored but expected to become significant at very high frequencies
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Special Course in Computer Science:
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Network-on-Chip (NoC) Why NoC OCP S
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From simpler to more complex chips
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Problems to solve • Cores that pe
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Some driving forces • Technical I
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NoC illustration
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OCP standard for on-chip communicat
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OCP Characteristics • IP Core •
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Flexibility of OCP • Several usef
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Some fundamental OCP concepts: Addr
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Some fundamental OCP concepts: In-b
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Some fundamental OCP concepts: Side
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Introduction • Network-on-chip (N
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Introduction • ISO/OSI network pr
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NoC Topology • Most direct networ
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NoC Topology • Folding torus topo
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NoC Topology • Indirect Topologie
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NoC Topology • (m, n, r) symmetri
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NoC Topology • Irregular or ad ho
Page 40 and 41: Switching strategies • Two main m
Page 42 and 43: Switching strategies • Allocating
Page 44 and 45: Switching strategies • VCT (virtu
Page 46 and 47: Routing algorithms • Static and d
Page 48 and 49: Routing algorithms • Minimal and
Page 50 and 51: Routing algorithms • Routing algo
Page 52 and 53: ACK/NACK flow control scheme • wh
Page 54 and 55: Clocking schemes • Fully synchron
Page 56 and 57: NoC Architectures examples
Page 58 and 59: HERMES • Developed at the Faculda
Page 60 and 61: Nostrum • Developed at KTH in Sto
Page 62 and 63: QNoC • Developed at Technion in I
Page 64 and 65: SPIN • Scalable programmable inte
Page 66 and 67: Emerging NoC paradigms Overall goal
Page 68 and 69: Novel Interconnect Paradigms for Mu
Page 70 and 71: Motivation • Increasingly harder
Page 72 and 73: Emerging Alternatives • Optical I
Page 74 and 75: Optical Interconnects • Board-to-
Page 76 and 77: Optical Interconnects • Waveguide
Page 78 and 79: Optical Interconnects • OIs have
Page 80 and 81: Optical Interconnects: Open Problem
Page 82 and 83: RF/Wireless Interconnects • Micro
Page 84 and 85: RF/Wireless Interconnects • Paths
Page 86 and 87: RF/Wireless Interconnects: Open Pro
Page 88 and 89: CNT Interconnects • Carbon nanotu
Page 94 and 95: Conceptual transmitter and receiver
Page 98 and 99: 3D and NoCs • 3D stacking technol
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Lecture 9 - Åbo Akademi

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