Help with 8-1 Multiplexer

Discussion in 'Homework Help' started by ITNetAngel, Jul 8, 2011.

  1. ITNetAngel

    Thread Starter New Member

    Jul 8, 2011
    4
    0
    a) Draw a logic diagram of an 8-1 multiplexer with eight 4-bit inputs and three control signals:
    Inputs: I0 = 0000 Select signals:
    I1 = 0100 S2
    I2 = 0010 S1
    I3 = 0001 S0
    I4 = 1111
    I5 = 1011
    I6 = 1101
    I7 = 1110
    Note: Each output will be one of the 4-bit inputs as determined by the select signals.

    b) For the 8-to-1 multiplexer above, draw a truth table showing the 4-bit outputs for each of the 8 input possibilities

    Select Signals
    Output
    S2
    S1
    S0
    0​
    0​
    0​
    0000​
    1​
    1​
    1​

     
  2. guitarguy12387

    Active Member

    Apr 10, 2008
    359
    12
    Hey and welcome to the forums.

    But you should know... while we're happy to help, we won't just do your homework for you. You need to post your attempted solution with specific questions. At which point, we can help you.
     
  3. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    You might want to indent your data a bit better too, to help others understand what you are saying. I take it you mean to write that the inputs are:
    I0 = 0000
    I1 = 0100
    I2 = 0010
    I3 = 0001
    I4 = 1111
    I5 = 1011
    I6 = 1101
    I7 = 1110

    The select signals are:
    S1,S2 and S3

    And you should have four truth tables, one for each output bit, with the layout:
    Inputs__________________|__Output
    Input bit | Select bits (1,2,3) | Output bit
     
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