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    encoders

    hello there! can anybody please tell me how to make an 8-3 encoder using 4-2 encoders or using logic gates. please help me. i will be grateful to you

    •   Alt7th July 2010, 23:26

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    how to make an 8-3 encoder using 4-2 encoders

    Are you talking about digital or analogue multiplexers? Do they have a disable? For two 4-2 analogue multiplexers, if they have a disable you would connect the outputs together, use the same two control lines connected to D0 & D1 of each, then use the D2 for one chip enable and NOT D2 for the other.

    Keith.
    I started life with nothing and I've still got most of it left. (Seasick Steve)


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    •   Alt8th July 2010, 10:50

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    how to make an 8-3 encoder using 4-2 encoders

    Fill Karnaug map for both the 8-3 and 4-2 Encoder and then extract the output equations relating 8-3 outputs to the 4-2 output. Then implement this fuction using simple logic gates to transform the 4 outputs of the 4-2 encoders into only 3 output.

    Advares.



    •   Alt8th July 2010, 12:32

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    how to make an 8-3 encoder using 4-2 encoders

    If it's digital the same sort of solution will apply, just add an inverter, assuming it has an enable:



    Keith.
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    Re: how to make an 8-3 encoder using 4-2 encoders

    im talking about 8-3 encoders. the figure you gave me is of a decoder


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    Re: how to make an 8-3 encoder using 4-2 encoders

    Oops, sorry. I must read more carefully

    In my defence, I was just working on some 8 way analogue multiplexers

    In which case it's a bunch of logic gates:

    http://tams-www.informatik.uni-hambu...priority83.gif

    Keith.

    Added after 58 minutes:

    Actually, you probably can combine a couple of 8:3 encoders. This may be helpful:
    http://faculty.cs.wwu.edu/johnson/cs...ltiplexers.ppt

    Keith

    (I'll get this link to work if it kills me!)


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