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The reason a design might specify a part with more RAM than its own calculation requires is

  • A.the linker requires half the RAM to remain unused
  • B.a communication stack or file system may be added later
  • C.RAM improves the flash endurance of the device
  • D.a larger RAM reduces the sleep current

Answer: B

A TCP stack, a graphics buffer or a file system each want kilobytes that nobody budgets for at the outset, and RAM is the resource that cannot be traded for anything else. Twenty-five per cent spare is a common and defensible provision.

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