Init nand2tetris

projects/01/Mux4Way16.hdl

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+// 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/Mux4Way16.hdl
+
+/**
+ * 4-way 16-bit multiplexor:
+ * out = a if sel == 00
+ *       b if sel == 01
+ *       c if sel == 10
+ *       d if sel == 11
+ */
+
+CHIP Mux4Way16 {
+    IN a[16], b[16], c[16], d[16], sel[2];
+    OUT out[16];
+
+    PARTS:
+    Mux16(a=a,b=b,sel=sel[0],out=mux16out1);
+    Mux16(a=c,b=d,sel=sel[0],out=mux16out2);
+    Mux16(a=mux16out1,b=mux16out2,sel=sel[1],out=out);
+}