# Spring 2002 ENGR 212 / CSCI 311 Homework 6

This is a double assignment, with twice the usual homework weight and twice the number of weeks for work. This assignment is due Friday, 22 March.

## Problem 1

In this problem, you will "program" the 6x8 PLA shown below, which can be downloaded as a JPEG image in a couple of different ways:

### Subproblem 1A

Program the PLA to perform concurrently perform the following three equations:

• F(a, b, c, d, e) = Σ(0, 5, 17, 19, 21, 25, 31) + d(2, 4, 7) ;
• G(a, b, c, d, e) = Σ(13, 15, 25) + d(0, 1, 2, 3, 4, 5, 6, 7) ;
• H(a, b, c, d, e) = Σ(12, 13, 14, 15, 20, 21, 22, 23, 31) + d(7, 30) ;

You really must use espresso to solve this problem. It's your only chance of accomplishing this task with eight terms.

### Subproblem 1B

This time design a PLA that takes four inputs, in two pairs of two bits each, A0, A1, B0, and B1. The PLA has two outputs, GT and LT. GT is 1 if the number of Ai that are 1 is greater than the number of Bi that are one. LT is 1 if the number of Ai that are 1 is less than the number of Bi that are one.

Again you better plan on using espresso.

## Problem 2

Write "programs" to solve Subproblem 1B in both ABEL and VHDL. Be sure to test out your programs using Xilinx Foundation.