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:
    	DMux4Way(in=in,sel[0]=sel[0],sel[1]=sel[1],a=w1,b=w2,c=w3,d=w4);
	Not(in=sel[2],out=nsel);
	And(a=nsel,b=w1,out=a);
	And(a=nsel,b=w2,out=b);
	And(a=nsel,b=w3,out=c);
	And(a=nsel,b=w4,out=d);
	DMux4Way(in=in,sel[0]=sel[0],sel[1]=sel[1],a=w5,b=w6,c=w7,d=w8);
	And(a=sel[2],b=w5,out=e);
	And(a=sel[2],b=w6,out=f);
	And(a=sel[2],b=w7,out=g);
	And(a=sel[2],b=w8,out=h);
	
	
}