Project 2: A Simple 4 Bit ALU

Course: 	CS 354
Posting Date:	January 22, 2001
Due Date:	April 4, 2001
Builds On:	Project 1

Use: Your favorite digital simulator.  Those who do not use Digital Works 2.0
will have to arrange to demonstrate their circuits on a computer with their
digital simulator installed.

1. Build the simple 1 bit ALU (without the SET line, but including the LESS 
input) as described in class.  Your 1 bit ALU is to do ADDITION, SUBTRACTION, 
AND and OR, but do NOT tie the B_INVERT and CarryIn lines together..  Use good 
hierarchical design; build most of it from prebuilt boxes constructed in 
project 1.

2. Build the simple 1 bit ALU, including the SET line, as described in class.  
Again, use good hierarchical design.

3. Build a simple 4 bit ALU by stringing together four 1 bit ALU's, as 
described in class.  The first three 1 bit ALU's will be instances of the ALU 
in problem 1.  This time, you do want to tie together the B_INVERT and CarryIn 
lines running into the first 1 bit ALU.  The fourth 1 bit ALU will be an 
instance of the ALU from problem 2.  Your 4 bit ALU is to do ADDITION, 
SUBTRACTION, AND, OR, and SLT (Set On Less Than).  Use good hierarchical 
design.

Hand in a typed (word processed) project report WITH YOUR NAME ON IT containing 
descriptive text, gate level circuit diagrams produced by your favorite digital
simulator or NEATLY drawn by hand using a template, and a 3.5" floppy disk 
containing the simulator files for your designs.  Your project report is to be 
handed in in a folder (the kind with pockets so the pages and floppy disk don't 
fall out).