Decoder help???????

Discussion in 'Homework Help' started by ne5pats, Apr 17, 2011.

  1. ne5pats

    Thread Starter New Member

    Mar 5, 2011
    13
    0
    Hello i been trying to figure out what codes do gate 1, gate 2, and gate 3 decode in the picture attached. please help
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Make a truth table. The Y term depends on the states of A0 - A2.
     
  3. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    I wouldn't call it a decoder, but rather a random Boolean function. It is expressed in a Product of Sums form.
     
  4. ne5pats

    Thread Starter New Member

    Mar 5, 2011
    13
    0
    y = 0
    0
    1
    1
    0
    1
    0
    0

    But, now? i dont understand what codes do gate 1, gate 2, and gate 3 decode )it's a question in a review sheet
     
  5. ne5pats

    Thread Starter New Member

    Mar 5, 2011
    13
    0
    and its in SOP
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Y is in one state for some states of A0 - A2, and the other for the remaining states of A0 - A2. Is there some common condition of the inputs for Y = 1, or for Y = 0?
     
  7. ne5pats

    Thread Starter New Member

    Mar 5, 2011
    13
    0
    oh i see it - they gave me some conditions in a timing diagram....THANKS
     
  8. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    Of course it is. My fingers slipped.
    Sorry for the misinformation.
     
Loading...