Origin 2000

• Intellectual descendant of Stanford DASH

• Two processors per node

• Caches use MESI protocol

• Directory has 7 states

  • Stable: unowned, shared, exclusive (cl/dirty in $)
  • Busy states: Processor not ready to handle new requests to that block: read, readex, uncached
  • Poison: used for other purposes

• Directory uses extended bit-vector

• HUB is the interface

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