Help needed on Logic Gate Questions

Discussion in 'Homework Help' started by challenger516, Mar 30, 2014.

  1. challenger516

    Thread Starter New Member

    Mar 30, 2014
    2
    0
    Hi, I am new to this forum, is it possible to help me on few Logic Gate questions please and the homework require us to name all of the gate.
    Thank you

    ok sorry guys, I did the first three logic gate.
    First one I do not know the name of the gate.
    A B X
    0 0 0
    1 0 1
    0 1 1
    1 1 0

    NOR Gate
    A B X
    0 0 1
    0 1 0
    1 0 0
    1 1 0

    NOR gate
    A B X
    0 0 1
    0 1 0
    1 0 0
    1 1 0
     
    Last edited: Mar 30, 2014
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,518
    2,369
    Fill in the truth table boxes and we will check it.
    Max.
     
  3. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
    2,802
    832
    This is Homework Help; not homework done for you. Fill in the tables as best you can, and repost the question.
     
  4. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,503
    380
    hi 516,
    Its usual for homework questions to post what you think the answers are, we can give help based on your answers.

    E
     
  5. challenger516

    Thread Starter New Member

    Mar 30, 2014
    2
    0
    ok sorry guys, I did the first three logic gate.
    First one I do not know the name of the gate.
    A B X
    0 0 0
    1 0 1
    0 1 1
    1 1 0

    NOR Gate
    A B X
    0 0 1
    0 1 0
    1 0 0
    1 1 0

    NOR gate
    A B X
    0 0 1
    0 1 0
    1 0 0
    1 1 0
     
  6. Papabravo

    Expert

    Feb 24, 2006
    10,138
    1,786
    The first gate does not have an official name. I think the truth table is wrong. The output is a 1 when A=1 or B=0. In words this would be A OR NOT B. The truth table you wrote was for Exclusive OR (XOR).
     
  7. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,387
    497
    Papabravo likes this.
  8. Papabravo

    Expert

    Feb 24, 2006
    10,138
    1,786
    Except that there is no entry for (A | ~B) which we know cannot be equivalent to (A ^ B)

    Nice table -- good article BTW
     
  9. WBahn

    Moderator

    Mar 31, 2012
    17,723
    4,788
    All of the 2-input logic gates have names, it's just that the asymmetric ones are seldom used (by name).

    A implies B means that if A is True, then B is True. If A is False, then B could be either True or False, so

    A​
    B​
    A \to B
    0[/center]
    0​
    1​
    0[/center]
    1​
    1​
    1[/center]
    0​
    0​
    1[/center]
    1​
    1​


    The proper name is actually "material implication". The remaining gates have similar names and meanings.

    http://en.wikipedia.org/wiki/Truth_table#Logical_implication
     
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