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A function is moved from software into hardware chiefly when it

  • A.is too complex to express in a high level language
  • B.is likely to change after the product ships
  • C.consumes too much flash memory in its software form
  • D.must meet a timing requirement the processor cannot

Answer: D

Correct answer: must meet a timing requirement the processor cannot

Hardware is chosen when the timing cannot be met in software - a response measured in nanoseconds, a sustained data rate, or many operations that must happen simultaneously rather than in sequence. The other considerations point the other way: a function likely to change belongs in software precisely because software can be changed after the product ships.

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