Specifying and Verifying a Broadcast and a Multicast Snooping Cache Coherence Protocol

  • Authors:
  • Daniel J. Sorin;Manoj Plakal;Anne E. Condon;Mark D. Hill;Milo M. K. Martin;David A. Wood

  • Affiliations:
  • Univ. of Wisconsin, Madison, WI;Univ. of Wisconsin, Madison, WI;Univ. of British Columbia, Vancouver, BC;Univ. of Wisconsin, Madison, WI;Univ. of Wisconsin, Madison, WI;Univ. of Wisconsin, Madison, WI

  • Venue:
  • IEEE Transactions on Parallel and Distributed Systems
  • Year:
  • 2002

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Abstract

In this paper, we develop a specification methodology that documents and specifies a cache coherence protocol in eight tables: the states, events, actions, and transitions of the cache and memory controllers. We then use this methodology to specify a detailed, modern three-state broadcast snooping protocol with an unordered data network and an ordered address network that allows arbitrary skew. We also present a detailed specification of a new protocol called Multicast Snooping and, in doing so, we better illustrate the utility of the table-based specification methodology. Finally, we demonstrate a technique for verification of the Multicast Snooping protocol, through the sketch of a manual proof that the specification satisfies a sequentially consistent memory model.