Digital logic design with MSI - Please Help

Discussion in 'Homework Help' started by excess-3, Jan 1, 2010.

  1. excess-3

    Thread Starter New Member

    Dec 28, 2009
    Hello all,
    I’m having trouble with this task:
    A small corporation has 10 shares of stock, and each share entitles its owner to one vote at a stockholder’s meeting. The 10 shares of stock are owned by four people as follows:

    Mr.W 1 share,
    Mr. X 2 shares
    Mr. Y 3 shares
    Mrs. Z 4 shares.

    Each of these persons has a switch to close when voting yes and to open when voting no for all his/her shares (one switch for each person).

    Task: It is necessary to design a circuit (using MSI components ONLY, a 7-segment display and some inverters if required) that displays the total number of shares that vote YES for each measure.

    If all shares vote NO for a measure, the display should be blank. If ten shares vote YES for a measure, the display should be 0, otherwise, the display shows a decimal number equal to the number of shares that vote YES.

    Use four chip 74151 multiplexers to design the combinational logic that converts the input from stockowners (ON-YES, OFF-NO) switches into the BCD digit for the 7-segment decoder/driver. Choose W to be the MSB, X, Y, Z to be selection lines of the MUX’s.

    I have this true table in mind

    Please someone help me to implement schematic diagram of four multiplexes.
    Thanks in advance
  2. excess-3

    Thread Starter New Member

    Dec 28, 2009
    Thanks for your answer DigitalLogician, i wish you a happy new year.But your example didn't help me bro:(
    This excercise which I refer above, is taken from "Digital Design 2nd Edition by Mano" book chapter 11.6 if it helps.
    I just want to design this circuit for digital logic laboratory.
  3. excess-3

    Thread Starter New Member

    Dec 28, 2009
    DigitalLogician I'm grateful to you for your help, thanks for your time.
    Last edited: Jan 11, 2010
  4. bard1290

    New Member

    Apr 19, 2010
    excess-3 could you please share the advice that the other guy gave you? I would be VERY grateful, as im in digital design also!