- #1

Richie Smash

- 293

- 15

I've gone through the various gates they ask for at this level such as: AND, OR, NAND, NOT and NOR gates.

I believe I understand each of these gates' specific functions, but then the next topic is about combination gates.

My textbook states, ''The use of several or more types of gates together to perform given functions is known as combinational logic.''

They then say NAND and NOR gates are most commonly used in making these combinational gates, and proceed to show diagrams of various NAND and NOR gates connected together, and their respective truth tables, but these diagrams are really confusing me. I don't seem to have a grasp on this topic.

http://uploads.im/MuU7e.jpg

http://uploads.im/YQpDU.jpg

Here are the two images, (I know off site sources are discouraged but I don't know how to attach an image here)

As you can see from these, they have various NAND and NOR together to produce say NOT, AND and OR gates, I just don't see how the truth tables add up, I just don't know what's going on here, does anyone know in detail about this subject?