Help on Not16

[thenar]

I figured out how to make all of the gates up until this point. The hardware simulator keeps giving me an error like "in[0..15]: the specified sub bus is not in the bus range" and I cannot figure out what to do. here is my code if you can help me please do.

Not (in[1..16]=in, out[1..16]=out);

[gcheong]

I would suggest drawing out the circuit diagram for the chip first to understand what it is you need in terms of individual components. You probably don't need to draw the whole Not16, but maybe try a Not4 to get the basic idea. For example if the following represents a Not2 then what do you need inside the box to make it work given that you already have a Not gate?

     in0 -------|-----------|-------- out0
                    |              |
     in1 -------|-----------|---------out1
             

[thenar]

I really don't know im sorry if you could help me more that would be great.

[ybakos]

Ben,
Spend time reviewing the appendix regarding HDL. It may take you multiple reads to really absorb, but it's worth it.

Here's a hint regarding one way to design any of the 16-bit chips: they'll require 16 of their 1-bit implementations.

[thenar]

maybe a not gate?

[thenar]

oh I know thank you and I spent like 3 hours yesterday reading appendix A

[thenar]

I did what you said and it says "in is not a pin in Nand"

[ybakos]

Look at the specification for NAND. What are it's pin names?

(Why are you constructing a 16-bit Not with anything other than 1-bit Nots?)

[Ben]

I changed it now it's saying that "in is not a pin in Not"

[gcheong]

You understand from ybakos that you will need 16 1-bit Not gates to make the 16-bit Not chip right? So the start of your HDL will look something like this (first 3 parts displayed):

CHIP Not16 {

    IN  in[16];
    OUT out[16];

    PARTS:
    Not(in=?,out=?);
    Not(in=?,out=?);
    Not(in=?,out=?);
   ....

So the task is how do you hook up each individual input of the Not16 to the input of a Not gate and then hook up each output of the Not gates to one of the ouputs of the Not16? These hookups are represented by the ? here. I hope I'm not giving away too much here.

[Ben]

no it appears as that i had the right idea it was mostly a syntax thing