nand2tetris/projects/01/Mux8Way16.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/Mux8Way16.hdl

/**
 * 8-way 16-bit multiplexor:
 * out = a == 000
 *       b == 001
 *       c == 010
         d == 011

         e == 100
         f == 101
         g == 110   
 *       h == 111
 */

CHIP Mux8Way16 {
    IN a[16], b[16], c[16], d[16],
       e[16], f[16], g[16], h[16],
       sel[3];
    OUT out[16];

    PARTS:
    Mux4Way16(a=a, b=b, c=c, d=d, sel=sel[0..1], out=ABCD);
    Mux4Way16(a=e, b=f, c=g, d=h, sel=sel[0..1], out=EFGH);

    Mux16(a=ABCD, b=EFGH, sel=sel[2], out=out);
}