DMux8Way.hdl

/**
 * 8-way Demux gate:
 *   out0 = Demux( Demux( Demux(in, sel[2])[0], sel[0] )[0], sel[0] )[0]
 *   out1 = Demux( Demux( Demux(in, sel[2])[0], sel[0] )[0], sel[0] )[1]
 *   out2 = Demux( Demux( Demux(in, sel[2])[0], sel[0] )[1], sel[0] )[0]
 *   out3 = Demux( Demux( Demux(in, sel[2])[0], sel[0] )[1], sel[0] )[1]
 *   out4 = Demux( Demux( Demux(in, sel[2])[1], sel[0] )[0], sel[0] )[0]
 *   out5 = Demux( Demux( Demux(in, sel[2])[1], sel[0] )[0], sel[0] )[1]
 *   out6 = Demux( Demux( Demux(in, sel[2])[1], sel[0] )[1], sel[0] )[0]
 *   out7 = Demux( Demux( Demux(in, sel[2])[1], sel[0] )[1], sel[0] )[1]  
 * 
 *    sel[2] sel[1] sel[0]  a  b  c  d  e  f  g  h
 *    ---------------------------------------------
 *      0      0      0     in 0  0  0  0  0  0  0
 *      0      0      1     0  in 0  0  0  0  0  0
 *      0      1      0     0  0  in 0  0  0  0  0
 *      0      1      1     0  0  0  in 0  0  0  0
 *      1      0      0     0  0  0  0  in 0  0  0
 *      1      0      1     0  0  0  0  0  in 0  0
 *      1      1      0     0  0  0  0  0  0  in 0
 *      1      1      1     0  0  0  0  0  0  0  in
 */

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

  PARTS:
    DMux(in=in, sel=sel[2], a=dmuxABCD, b=dmuxEFGH);
    DMux(in=dmuxABCD, sel=sel[1], a=dmuxAB, b=dmuxCD);
    DMux(in=dmuxEFGH, sel=sel[1], a=dmuxEF, b=dmuxGH);
    DMux(in=dmuxAB, sel=sel[0], a=a, b=b);
    DMux(in=dmuxCD, sel=sel[0], a=c, b=d);
    DMux(in=dmuxEF, sel=sel[0], a=e, b=f);
    DMux(in=dmuxGH, sel=sel[0], a=g, b=h);
}