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Homework Help: 5 to 24 decoder from 3 to 8 decoders

  1. Jan 22, 2009 #1
    1. The problem statement, all variables and given/known data
    Design a 5:24 decoder using three 3:8 decoders and one 2:4 decoder.
    1)Show the truth table.
    2)Draw a block diagram of the final decoder. Use X4 as the MSB and X0 as the LSB.

    2. The attempt at a solution
    I have the truth table drawn. Because it is a 33 line truth table I don't want to type it out. But I start out with:
    EN X:43210 Y:
    0 xxxxx
    1 00000 Y0=1
    1 00001 Y1=1
    1 10111 Y23=1

    I am having trouble figuring out how to connect the decoders to get a proper decoder.
    Last edited: Jan 22, 2009
  2. jcsd
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