DMux8Way.hdl

// This file is part of www.nand2tetris.org
// and the book "The Elements of Computing Systems"
// by Nisan and Schocken, MIT Press.
// File name: projects/01/DMux8Way.hdl

/**
 * 8-way demultiplexor:
 * {a, b, c, d, e, f, g, h} = {in, 0, 0, 0, 0, 0, 0, 0} if sel == 000
 *                            {0, in, 0, 0, 0, 0, 0, 0} if sel == 001
 *                            etc.
 *                            {0, 0, 0, 0, 0, 0, 0, in} if sel == 111
 */

CHIP DMux8Way {
    IN in, sel[3];
    OUT a, b, c, d, e, f, g, h;

    PARTS:
    // Put your code here:
    Not(in=sel[0], out=sel0inv);
    Not(in=sel[1], out=sel1inv);
    Not(in=sel[2], out=sel2inv);

    And(a=in, b=sel0inv, out=a1);
    And(a=a1, b=sel1inv, out=a2);
    And(a=a2, b=sel2inv, out=a); 

    And(a=in, b=sel[0], out=b1);
    And(a=b1, b=sel1inv, out=b2);
    And(a=b2, b=sel2inv, out=b); 

    And(a=in, b=sel0inv, out=c1);
    And(a=c1, b=sel[1], out=c2);
    And(a=c2, b=sel2inv, out=c); 

    And(a=in, b=sel[0], out=d1);
    And(a=d1, b=sel[1], out=d2);
    And(a=d2, b=sel2inv, out=d); 

    And(a=in, b=sel0inv, out=e1);
    And(a=e1, b=sel1inv, out=e2);
    And(a=e2, b=sel[2], out=e); 

    And(a=in, b=sel[0], out=f1);
    And(a=f1, b=sel1inv, out=f2);
    And(a=f2, b=sel[2], out=f); 

    And(a=in, b=sel0inv, out=g1);
    And(a=g1, b=sel[1], out=g2);
    And(a=g2, b=sel[2], out=g); 

    And(a=in, b=sel[0], out=h1);
    And(a=h1, b=sel[1], out=h2);
    And(a=h2, b=sel[2], out=h); 
}