DMux8Way

1對8 DMux，1條資料線，3條選擇線，a,b,c,d,e,f,g,h 8條輸出線。

  | in  |  sel  |  a  |  b  |  c  |  d  |  e  |  f  |  g  |  h  |
  |  0  |  000  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |
  |  0  |  001  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |
  |  0  |  010  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |
  |  0  |  011  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |
  |  0  |  100  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |
  |  0  |  101  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |
  |  0  |  110  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |
  |  0  |  111  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |
  |  1  |  000  |  1  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |
  |  1  |  001  |  0  |  1  |  0  |  0  |  0  |  0  |  0  |  0  |
  |  1  |  010  |  0  |  0  |  1  |  0  |  0  |  0  |  0  |  0  |
  |  1  |  011  |  0  |  0  |  0  |  1  |  0  |  0  |  0  |  0  |
  |  1  |  100  |  0  |  0  |  0  |  0  |  1  |  0  |  0  |  0  |
  |  1  |  101  |  0  |  0  |  0  |  0  |  0  |  1  |  0  |  0  |
  |  1  |  110  |  0  |  0  |  0  |  0  |  0  |  0  |  1  |  0  |
  |  1  |  111  |  0  |  0  |  0  |  0  |  0  |  0  |  0  |  1  |

    /**
   * 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:
            DMux(in = in,   sel = sel[0], a = aceg, b = bdfh);
            DMux(in = aceg, sel = sel[1], a = ae, b = cg);
            DMux(in = bdfh, sel = sel[1], a = bf, b = dh);
            DMux(in = ae,   sel = sel[2], a = a, b = e);
            DMux(in = cg,   sel = sel[2], a = c, b = g);
            DMux(in = bf,   sel = sel[2], a = b, b = f);
            DMux(in = dh,   sel = sel[2], a = d, b = h);
        }