36 lines
870 B
Plaintext
36 lines
870 B
Plaintext
// 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/DMux4Way.hdl
|
|
|
|
/**
|
|
* 4-way demultiplexor:
|
|
* {a, b, c, d} = {in, 0, 0, 0} if sel == 00
|
|
* {0, in, 0, 0} if sel == 01
|
|
* {0, 0, in, 0} if sel == 10
|
|
* {0, 0, 0, in} if sel == 11
|
|
*/
|
|
|
|
CHIP DMux4Way {
|
|
IN in, sel[2];
|
|
OUT a, b, c, d;
|
|
|
|
PARTS:
|
|
// Put your code here:
|
|
And(a=sel[0], b=sel[1], out=out1);
|
|
And(a=in, b=out1, out=d);
|
|
|
|
//Invert sel, 00 => 11
|
|
Not(in=sel[0], out=out2);
|
|
Not(in=sel[1], out=out3);
|
|
And(a=out2, b=out3, out=out4);
|
|
And(a=out4, b=in, out=a);
|
|
|
|
//Output B?
|
|
And(a=sel[0], b=out3, out=out5);
|
|
And(a=out5, b=in, out=b);
|
|
|
|
//Output C?
|
|
And(a=sel[1], b=out2, out=out6);
|
|
And(a=out6, b=in, out=c);
|
|
} |