Mastering VHDL: Sample Assignments and Solutions for Advanced Learners

Are you struggling to decipher the intricacies of VHDL assignments? Fear not, for your quest ends here! As seasoned experts in VHDL programming, we at ProgrammingHomeworkHelp.com specialize in unraveling the complexities of VHDL and guiding students towards mastery. In this post, we present a couple of challenging VHDL questions along with detailed solutions, crafted by our expert team. So, if you find yourself grappling with VHDL complexities, simply say, "Write my VHDL assignment," and let us pave the path to success for you.

Question 1: Implementing a Finite State Machine (FSM)

Consider the following scenario: You are tasked with designing a finite state machine (FSM) that controls the operation of a vending machine. The vending machine has three states: Idle, Accepting_Coins, and Dispensing. The machine accepts coins of 5 cents and 10 cents denominations. When the total amount of deposited coins reaches 15 cents or more, it dispenses a product and returns to the Idle state. Implement this FSM in VHDL.

Solution:

library ieee;
use ieee.std_logic_1164.all;

entity Vending_Machine is
  port (
    clk, reset, coin_5, coin_10 : in std_logic;
    dispense : out std_logic
  );
end entity Vending_Machine;

architecture behavior of Vending_Machine is
  type state_type is (Idle, Accepting_Coins, Dispensing);
  signal current_state, next_state : state_type;

begin
  process (clk, reset)
  begin
    if reset = '1' then
      current_state <= Idle;
    elsif rising_edge(clk) then
      current_state <= next_state;
    end if;
  end process;

  process (current_state, coin_5, coin_10)
  begin
    case current_state is
      when Idle =>
        if coin_5 = '1' then
          next_state <= Accepting_Coins;
        elsif coin_10 = '1' then
          next_state <= Accepting_Coins;
        else
          next_state <= Idle;
        end if;
      when Accepting_Coins =>
        if coin_5 = '1' then
          next_state <= Accepting_Coins;
        elsif coin_10 = '1' then
          next_state <= Accepting_Coins;
        else
          next_state <= Dispensing;
        end if;
      when Dispensing =>
        next_state <= Idle;
      when others =>
        next_state <= Idle;
    end case;
  end process;

  dispense <= '1' when current_state = Dispensing else '0';

end architecture behavior;

Question 2: Designing a 4-bit Binary Counter with Enable

Design a 4-bit binary counter with an enable input. The counter should increment its value only when the enable input is asserted. Additionally, the counter should reset to zero when it reaches its maximum value (15) and the enable input is still asserted. Implement this counter in VHDL.

Solution:

library ieee;
use ieee.std_logic_1164.all;

entity Binary_Counter is
  port (
    clk, reset, enable : in std_logic;
    count_out : out std_logic_vector(3 downto 0)
  );
end entity Binary_Counter;

architecture behavior of Binary_Counter is
  signal counter : std_logic_vector(3 downto 0) := "0000";

begin
  process (clk, reset)
  begin
    if reset = '1' then
      counter <= "0000";
    elsif rising_edge(clk) then
      if enable = '1' then
        if counter = "1111" then
          counter <= "0000";
        else
          counter <= counter + 1;
        end if;
      end if;
    end if;
  end process;

  count_out <= counter;

end architecture behavior;

Conclusion

Mastering VHDL is no easy feat, but with dedication and guidance, you can conquer its complexities. In this post, we've delved into two challenging VHDL assignments and provided comprehensive solutions. Whether you're grappling with finite state machines or binary counters, remember that assistance is just a click away. Don't hesitate to reach out to us at ProgrammingHomeworkHelp.com for expert guidance on your VHDL assignments. Happy coding!