FPGA Programming for Beginners

Chapter 4: Let's Build a Calculator

In this chapter, we are going to take our SystemVerilog knowledge of combinational logic and sequential elements to discuss state machine design. We'll look at the classic state machine designs and develop a traffic light controller, a staple of Electrical Engineering (EE) projects.

We've built a controller for a 7-segment display that we can use to show numerical values and we know how to handle button and switch inputs safely. Now, we'll take this knowledge and show how we can define a state machine to keep track of the calculation we want to perform and develop our first truly useful design, a simple calculator capable of entering two 16-bit numbers and adding, subtracting, multiplying, and dividing them, ...