CSE 140L Hardware Lab One

Objective

In this lab, you will learn to build gray-code encoder and decoder. You will also learn to build a 7-segment display encoder

Part 1. 7-segment display

Given a number between 0 and 9 as input, output the 7-segment display code (Simplify all variables but "D" in the 7-segment circuit).  


         input/ output
         wxyz abcdefg
         ------ ------------
         0000 1111110
         0001 0110000
         0010 1101101
         0011 1111001
         0100 0110011
         0101 1011011
         0110 1011111
         0111 1110000
         1000 1111111
         1001 1111011

 

 

Part 2. Construction of a Combinational Logic for the Gray-code ENCODER

Design a combinational logic circuit that converts three-bit binary code counter to three-bit gray-code counter (Gray Code ENCODER)

abc wxy
000 000
001 001
010 011
011 010
100 110
101 111
110 101
111 100

 

Part 3. Construction of a Combinational Logic for the Gray-code DECODER

wxy efg
000 000
001 001
011 010
010 011
110 100
111 101
101 110
100 111

 

 

Grading: Show your circuit design & demonstrate your simulation result to the TA or professor at office hours during week 3.