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The width of the data bus of a processor determines

  • A.how much memory the processor is able to address
  • B.the number of peripherals that may be connected
  • C.the maximum clock frequency the bus can sustain
  • D.how many bits are transferred per memory access

Answer: D

Address lines fix the reach and data lines fix the throughput per access, and the two are independent: an 8-bit machine with twenty address lines reaches a megabyte one byte at a time. Confusing the two is the commonest slip in bus questions.

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