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Digital_Lab_01

"Displaying the input signal value on the 7-segment LED display"

Choon B. Kim, Ph.D., a retired ASIC engineer

1. Design Specifications:

1.1) Your design takes an input of 4-bit binary number at the Toggle Switches(SW[3:0]) (Up=1, Down=0).

1.2) The input bit is also indicated by the Red LEDs(LEDR[3:0]) (ON=1, OFF=0).

1.3) The design converts the input value into a 2-digit decimal number and a hexadecimal number.

1.4) The design displays the results on four 7-SEG Display Modules(HEX3-HEX0):

The decimal number at HEX3 and HEX2. The hexadecimal number at HEX0.

Input and Output table

Input Output

SW[3:0] HEX3HEX2 HEX0

-----------------------------------------------------------------

0000 00 0

0001 01 1

0010 02 2

0011 03 3

.....

1000 08 8

1001 09 9

1010 10 A

1011 11 b // <--- Use lower case b here

1100 12 C

1101 13 d // <--- Use lower case d here

1110 14 E

1111 15 F

-----------------------------------------------------------------

2. Testing (video on YouTube):

Test case:
Display several numbers at random.

3. Recommended additional work:

Add an input value checking feature to above Lab by doing followings.

Connect an LED light(e.g., green color) to the board IO port(e.g., GPIO).

It's ON if (input value) >= A in hex(=10 in decimal).

4. Key lesson(s) learned from this Lab:

- Basic digital design flow with FPGA board, EDA SW, HDL(Verilog, SystemVerilog, VHDL, etc.) and its synthesizable set.

DESIGN => VERIFICATION => SYNTHESIS => PROGRAMMING FPGA => TESTING & DEBUGGING CYCLE

- Basic combinational circuit design skill

5. Timing(optional):

Assuming your design is used as a part of a bigger clock-based system, find the maximum clock frequency of your design.

Explain how you get it.

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