CHIPPER: A Low-Complexity Bufferless Deflection Router

Provided by: Carnegie Mellon University
Format: PDF
As Chip Multi-Processors (CMPs) scale to tens or hundreds of nodes, the interconnect becomes a significant factor in cost, energy consumption and performance. Recent work has explored many design tradeoffs for Networks-on-Chip (NoCs) with novel router architectures to reduce hardware cost. In particular, recent work proposes bufferless deflection routing to eliminate router buffers. The high cost of buffers makes this choice potentially appealing, especially for low-to-medium network loads. However, current bufferless designs usually add complexity to control logic. Deflection routing introduces a sequential dependence in port allocation, yielding a slow critical path. Explicit mechanisms are required for live-lock freedom due to the non-minimal nature of deflection.

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