3. Let's suppose that you have two inputs on FPGA GPIO's. One is for 'a' and other one is for 'b'. Write a program that calculates the time interval between a and b. (First as soon as 'a' becomes '1', your counter should start counting then it counts until b=1.) Thereafter you should write a Seven Segment Module that writes the elapsed time (units will be measured in ms) on your seven segment then call this module in an appropriate way. (For example give each digit as input parameter with modulus '%' operation. You can make mathematical operations among register values in FPGA such as '+/=/) (20 pts)