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Assertion: a Harvard machine generally achieves more work per clock cycle than a von Neumann one. Reason: it can fetch an instruction and access data simultaneously.

  • A.the assertion is false although the reason offered is a true statement in itself
  • B.both the assertion and the reason are true and the reason explains the assertion
  • C.both the assertion and the reason are true but the reason does not explain the assertion
  • D.the assertion is true but the reason given for it is false

Answer: B

The shared bus of a von Neumann machine forces the fetch and the data access into separate cycles, and removing that constraint is exactly where the extra throughput comes from. The cost is more silicon and, on an external bus, more pins.

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