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A bus arbiter is needed when

  • A.the processor and the memory run at different clock rates
  • B.peripherals are memory-mapped rather than port-mapped
  • C.two or more masters may want the bus at the same time
  • D.the data bus is wider than the address bus

Answer: C

A core and a DMA controller are both masters, and without arbitration their accesses would collide. The policy the arbiter uses, whether fixed priority or round robin, is what determines the worst-case delay each master can suffer.

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