---
+ Post New Thread
Results 1 to 7 of 7
  1. #1
    Full Member level 5
    Points: 2,926, Level: 12

    Join Date
    Feb 2006
    Location
    tokyo
    Posts
    297
    Helped
    6 / 6
    Points
    2,926
    Level
    12

    Interview Q

    hi,

    hw to implement 4:1 mux and 2:1 mux as Nor gate?

    ple reply soon its urgent.

    thanks in advance.

    bye,
    Prasad

    •   Alt22nd March 2006, 19:13

      advertising

        
       

  2. #2
    Member level 2
    Points: 1,362, Level: 8

    Join Date
    Mar 2006
    Posts
    43
    Helped
    0 / 0
    Points
    1,362
    Level
    8

    Re: Interview Q

    2 x 1 MUX, make the equation first:

    O = (EN & A) | (ENb & B)

    then make it logic gates

    finally replace to NOR gates



  3. #3
    pra
    pra is offline
    Member level 5
    Points: 2,185, Level: 10

    Join Date
    Jan 2005
    Posts
    85
    Helped
    10 / 10
    Points
    2,185
    Level
    10

    Re: Interview Q

    Check the document



    •   Alt23rd March 2006, 10:57

      advertising

        
       

  4. #4
    Member level 4
    Points: 1,690, Level: 9

    Join Date
    Feb 2006
    Posts
    69
    Helped
    6 / 6
    Points
    1,690
    Level
    9

    Re: Interview Q

    For a 2 input nor gate,there are 4 possible combinations,so we can implement it using 4 x 1 multiplexer.The two inputs A and B are given to the mux as selection inputs and keeping enable signal high.

    Now for 2 input nor gate the output will be 1 when all inputs are 0.,thus we will connect Vcc to I0 and ground to I1,I2 and I3.



  5. #5
    Member level 4
    Points: 1,690, Level: 9

    Join Date
    Feb 2006
    Posts
    69
    Helped
    6 / 6
    Points
    1,690
    Level
    9

    Re: Interview Q

    I have drawn the diagram for nor gate by using 2 X 1 MUX



  6. #6
    Junior Member level 3
    Points: 1,218, Level: 7

    Join Date
    Dec 2006
    Posts
    26
    Helped
    6 / 6
    Points
    1,218
    Level
    7

    Re: Interview Q

    hi,

    Nor using 4×1 mux, suppose A,B are select lines. Y is output.
    I0,I1,I2,I3 are input to mux.
    Give VDD to I0,
    GND to I1,I2,I3.


    Nor using 2×1 mux,
    I0,I1 are input to mux,
    Take A as select line.
    Give complement of B to I0 input of Mux.
    Gnd to I1 input of Mux.

    Checkfunctionality.

    Hop u understand.

    If u hav any doubts tell me.



  7. #7
    Full Member level 1
    Points: 2,111, Level: 10

    Join Date
    Jul 2006
    Posts
    117
    Helped
    8 / 8
    Points
    2,111
    Level
    10

    Interview Q

    Hi p_shinde
    Look what a nor gate does.Assume A and B are inputs.
    If B zero it passes the (A complement) to output.
    if B is one then output is '0'.
    Now connect B to select
    A' to LSB input
    and logic 1 to MSB input

    Regards
    tronix



+ Post New Thread
Please login