Gates, 7447, 74185.

Discussion in 'Homework Help' started by ichikawa, Jun 9, 2015.

  1. ichikawa

    Thread Starter New Member

    Jun 9, 2015
    2
    0
    Hello,

    During the last classes we worked on 7447, 74185 converters and displaying DEC/BIN numbers. I`m stuck with my homework right now.

    Build a logical gate function with NOR (2 inputs) and OR (2 inputs) gates only which realize following task: 1 0 0 1 0 1 1 0 0 1 0 0 1 1 1 1

    Inputs: 4 switches SW
    Outputs: 2 7-segments displays which show decimal entered number + one 7-segment display which show actual output state (0 or 1). For displaying decimal numbers I have to use 74185 and 7447 modules, for displaying 0 or 1 - 7447 only.

    I made truth table, K-maps, and schema


    [​IMG]



    But I have no access to FPGA Cyclone II on which we work and I can`t figure out how to replace all this gates with 3 converters and two gates only. Could anyone give me any suggestions? Sorry for my English.

    Thank You.
     
  2. WBahn

    Moderator

    Mar 31, 2012
    17,715
    4,788
    What is this "task" that is "1 0 0 1 0 1 1 0 0 1 0 0 1 1 1 1"?

    What is this "actual output state"? Actual output state of what?

    How do the switches relate to that string of bits that is your "task"?

    So show your truth table and your K-maps. We are NOT mind readers.
     
  3. panic mode

    Senior Member

    Oct 10, 2011
    1,318
    304
    I will just mention De Morgan...
     
  4. ichikawa

    Thread Starter New Member

    Jun 9, 2015
    2
    0
    Yes indeed, I solved the problem. Thanks anyway.
     
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