can some one explain to me this mux >prom implementation circuit..

Discussion in 'Homework Help' started by transgalactic, May 3, 2008.

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  1. transgalactic

    Thread Starter Active Member

    Apr 29, 2008
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    i need to implement a 8-1 MUX using 2^3X4 and 2^3X1 proms

    where there is a chip select input in the MUX

    here is the solution of the circuit and the programming tables


    http://s290.photobucket.com/albums/ll279/t...=IMG_8816-1.jpg

    i cant understand this circuit
    there is s0 that goes in every prom independently
    there is a chip select input inside of the "main prom"

    i tried to trace out the way it works with pencil and paper
    but this this really tough to understand

    i couldnt get this pattern like in ordinary mux
    that if we take s0=0 s1=0 s2=1 then take I1
    eventually i got to the right answers
    but i coudnt understand why????????
     
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