Lab 3 Seven-Segment Display on An FPGA (2-week lab)

1. Using Verilog and Vivado to demonstrate the following combinational logic blocks in both simulation and on the board (switches/leds):
1) Inverter 2) 2-bit full adder 3) 8-input And 4) 4-1 MUX (can use an embedded condition: y=s1?(s0?d3:d2):(s0?d1:d0))
Note the Verilog conditional operator: (condition ? value_if_true : value_if_false)

2. Using Verilog and Vivado to design a 'Running LED' program on the FPGA board. Use 4 LEDs on the board, turn on each of them for 1 second one-by-one. The demonstration video can be found in the following:

Make sure you have a 'reset' function to reset the LEDs to the original state.

Hints for this program:
1) The timing for the running led is controlled by the on-board oscillator (100 MHz). To convert it to a 1 second timer, we need to count for 100 MEG times and then do something. Before you code anything, make sure you enable the clock in your constraint file.

2) The main frame for the module can be:

I crossed out some of the parameters/variables in the program, complete this yourself.

3) Design a testbench for this module. Use sw[0] as 'rst' (reset, which is able to restart everything when rst=1), use LED[3:0] as the 4 running LEDs. Demonstrate it on your FPGA board. (directly download the bit file to the FPGA, no need to program it in the bin file and store the code into the on-board memory).

3. Interface the switches with the 7-segment display on the board. (make sure you have the '##7 segment display' part in your constraint file uncommented)
The final result should show numbers 0-9. There are some examples in the following figure.
sw[3:0] provide binary inputs and the 4 7-segment display show the corresponding decimal numbers.


You can complete this outline, and generate a testbench for it. 

The circuit map for the 7-segment display and the FPGA can be found in the datasheet of Basys3 (in the front of this lab instruction). The two major connections:


4. Modify the code, disable any 3 of the 7-segment displays and only show the number on one of the displays.


1. Complete the tasks in Sections 1 - 4. 25 points for each section.