11. Read-Only Memories (ROM's) are constructed from which of the following components? Select the best answer.

  1. A DECODER and a MUX
  2. A MUX and a DEMUX
  3. A DECODER and an ENCODER
  4. A MUX and an ENCODER
  5. An ENCODER and a DEMUX

3 is CORRECT. A 2^n x m ROM consists of an n to 2^n DECODER, plus a 2^n to m ENCODER, where n designates the number of ROM inputs, and m specifies the number of ROM outputs.

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