4 logic operations in one IC. help with LogicWorks.

Discussion in 'The Projects Forum' started by TheSpArK505, Dec 13, 2013.

  1. TheSpArK505

    Thread Starter Member

    Sep 25, 2013
    92
    0
    I,m working on an IC circuit that compares,adds,subtracts and multiply. Each operation at a time. It's obvious that I need a decoder to "pick" an opearation according to it's inputs.
    It seems complicated but it's not. Now I have every thing prepeared,but when I want to simulate it with LogicWorks5 here the problems begin.

    I don,t know how to design an enable input that is connected to the outputs of the decoder,So that only the picked IC works.

    So,if anyone familiar with logicworks5 please help me please with how to design an IC with an enable input?????

    Thank you.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,343
    Hello,

    You might want to have a look at the 74181 ALU chip.

    Bertus
     
  3. TheSpArK505

    Thread Starter Member

    Sep 25, 2013
    92
    0
    I.m afraid that I have to design...so can anyone help me please??
     
  4. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    So, post your design thus far so we can take a look...
     
  5. ScottWang

    Moderator

    Aug 23, 2012
    4,848
    767
    An enable signal just like using "1" to enable one input of AND or NAND gate, and using "0" to disable, if you want then you can also using "0" to enable one input of OR or NOR gate, and using "1" to disable.

    74LS138 datasheet, to see the page 2 - Logic Diagrams.
     
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