用HDL显示白底黑字的“FPGA”字符

要在FPGA上显示“FPGA”字符，可以使用VHDL或Verilog语言编写代码来生成HDL模块，并使用FPGA开发工具将其合成到FPGA芯片中。以下是示例VHDL代码：

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity FPGA_display is
    Port ( clk : in  STD_LOGIC;
           reset : in  STD_LOGIC;
           display : out  STD_LOGIC_VECTOR (6 downto 0));
end FPGA_display;

architecture Behavioral of FPGA_display is

    signal counter : integer range 0 to 20000000 := 0;
    signal digit : integer range 0 to 3 := 0;
    signal data : std_logic_vector(6 downto 0) := "0000000";
    signal fpga : std_logic_vector(27 downto 0);

begin

    process (clk, reset)
    begin
        if (reset = '1') then
            counter <= 0;
            digit <= 0;
            data <= "0000000";
            fpga <= "00000000000000000000000001000010";
        elsif (rising_edge(clk)) then
            counter <= counter + 1;
            if (counter = 10000000) then
                counter <= 0;
                digit <= digit + 1;
                case digit is
                    when 0 =>
                        data <= "0111111";
                    when 1 =>
                        data <= "0000110";
                    when 2 =>
                        data <= "1011011";
                    when 3 =>
                        data <= "1001111";
                end case;
            end if;
        end if;
    end process;

    fpga(3 downto 0) <= data;
    fpga(27 downto 4) <= "00000000000000000000000001000010";

    display <= fpga(6 downto 0);

end Behavioral;

在这个示例中，我们使用了一个时钟信号和一个复位信号，并使用一个计数器来控制每个数字的显示时间。我们将HDL模块的输出连接到FPGA芯片的显示器引脚上。