MultiBit AND gate

[GustavoB]

I'm having a problem on MultiBit AND gate. The description say it has 16 outputs, but If i connect the A input and the B input of the AND gate on the First and second input of the Multi bit AND (Like the left image), I can have only 8 outputs. Connecting it as the right way seems useless, I was thinking about the connections being made on the permutations of the inputs, but like this i'm going to have 224 outputs (i guess).

I'm a little clueless on this.

[cadet1620]

The skeleton file for the And16 says:

// This file is part of the materials accompanying the book
// "The Elements of Computing Systems" by Nisan and Schocken,
// MIT Press. Book site: www.idc.ac.il/tecs
// File name: projects/01/And16.hdl

/**
 * 16-bit and gate.  For i=0..15 out[i] = a[i] and b[i]
 */

CHIP And16 {

    IN  a[16], b[16];
    OUT out[16];

This syntax means that a, b and out are 16 wire buses. Read appendix A.5.3 to learn more about buses.

And16 is nothing more than a box that has 16 And gates in it: out wire 0 = a wire 0 AND b wire 0, etc.

--Mark

[GustavoB]

Oh, I got it. I thought it should have a total of 16 "mono" inputs and 16 "mono" outputs, but there should be 32 "mono" inputs (or 16 "stereo" inputs) and 16 "mono" outputs.

[cadet1620]

You will do better to think of And16 as having two input buses and one output bus, each with 16 wires.  Don't think stereophonic, but rather 16-ophonic. That's a lot of speakers!

--Mark