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A design requires a 32-bit core, 2 MB of flash, an Ethernet MAC and a Linux kernel. The appropriate device class is

  • A.a field programmable gate array with a soft processor core
  • B.an application processor with external DRAM
  • C.an 8-bit microcontroller with an external memory bus
  • D.a bare microprocessor with no on-chip peripherals at all

Answer: B

A general purpose kernel needs a memory management unit and tens of megabytes of RAM, which puts the design beyond any microcontroller. An FPGA with a soft core could be made to work but would cost far more in parts and effort for a standard requirement.

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