Specifying a

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• Specifying a
• Network-on-Chip
• Dominic Richards, David Lester
• The University of Manchester

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Motivation
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Concurrent Haskell
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The SpiNNaker System

• Custom HPC to simulate neural systems
• Homogeneous network of SpiNNaker chips
• Each chip has 20 processor cores
• Neural firing event ? multicast packet
  transmission...
• ... routed through NoCs and inter-chip links
• System robust to link and chip failure

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A Formal Specification

• Simple global behavior creates complex
  distributed behavior
• Formal specification gives clear statement of
  intent for design
• To which formal verification can be applied
• Concurrent Haskell
• substantial support for concurrency
• Executable specifications

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Fault ToleranceA Distributed View
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Fault ToleranceA Distributed View
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Normal Packets
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E1 Packets
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N_E1 Packets
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Dropped Packets
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Conclusion

• Formal Specification can give practical
  reassurances for error-prone components of
  hardware design
• Concurrent Haskell is a powerful tool for
  specification of Networks-on-Chip

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