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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 [Broken]

i can't 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 couldn't 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?

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 [Broken]

i can't 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 couldn't 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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