动态扫描显示电路设计

设计8位动态扫描显示电路，8位显示字型自选。
要求写出代码，给出仿真波形。

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_unsigned.all;



entity scan is

    port( CLK : in std_logic;



          DATA : in std_logic_vector(31 downto 0);

          

          POINT_CTL : in std_logic_vector(7 downto 0);

          POINT_OUT : out std_logic;

          --test output

          TEST : out std_logic_vector(2 downto 0);

          

          SEG_OUT : out std_logic_vector(6 downto 0);

          SEG_CTL : out std_logic_vector(7 downto 0));

end scan;

          

architecture BHV of scan is

    signal CNT : std_logic_vector(2 downto 0);

    signal DATA_BUF : std_logic_vector(3 downto 0);

begin

    COUNT : process(CLK)

    begin

        if rising_edge(CLK) then

            CNT <= CNT + 1;

        end if;

        TEST <= CNT;

    end process COUNT;

    

    SELECT_SEG : process(CLK)

    begin

        if rising_edge(CLK) then

            case CNT is

                when "000" =>

                    SEG_CTL <= "11111110";

                    POINT_OUT <= POINT_CTL(0);

                    DATA_BUF <= DATA(3 downto 0);

                when "001" =>

                    SEG_CTL <= "11111101";

                    POINT_OUT <= POINT_CTL(1);

                    DATA_BUF <= DATA(7 downto 4);

                when "010" =>

                    SEG_CTL <= "11111011";

                    POINT_OUT <= POINT_CTL(2);

                    DATA_BUF <= DATA(11 downto 8);

                when "011" =>

                    SEG_CTL <= "11110111";

                    POINT_OUT <= POINT_CTL(3);

                    DATA_BUF <= DATA(15 downto 12);

                when "100" =>

                    SEG_CTL <= "11101111";

                    POINT_OUT <= POINT_CTL(4);

                    DATA_BUF <= DATA(19 downto 16);

                when "101" =>

                    SEG_CTL <= "11011111";

                    POINT_OUT <= POINT_CTL(5);

                    DATA_BUF <= DATA(23 downto 20);

                when "110" =>

                    SEG_CTL <= "10111111";

                    POINT_OUT <= POINT_CTL(6);

                    DATA_BUF <= DATA(27 downto 24);

                when "111" =>

                    SEG_CTL <= "01111111";

                    POINT_OUT <= POINT_CTL(7);

                    DATA_BUF <= DATA(31 downto 28);

                when others =>

                    null;

            end case;

        end if;

    end process SELECT_SEG;

    

    DISPLAY : process(DATA_BUF)

    begin

        --display 0-9

        case DATA_BUF is

            when "0000" =>

                --display 0

                SEG_OUT <= "1111110";

            when "0001" =>

                --display 1

                SEG_OUT <= "0000110";

            when "0010" =>

                --display 2

                SEG_OUT <= "1101101";

            when "0011" =>

                --display 3

                SEG_OUT <= "1111001";

            when "0100" =>

                --display 4

                SEG_OUT <= "0110011";

            when "0101" =>

                --display 5

                SEG_OUT <= "1011011";

            when "0110" =>

                --display 6

                SEG_OUT <= "1011111";

            when "0111" =>

                --display 7

                SEG_OUT <= "1110000";

            when "1000" =>

                --display 8

                SEG_OUT <= "1111111";

            when "1001" =>

                --display 9

                SEG_OUT <= "1111011";

            when others =>

                null;

        end case;

    end process DISPLAY;

end BHV;

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