led显示（动态扫描方式）的vhdl实现 - arm-嵌入式系统设计 - cbqcgq - 和讯博客.htm
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<div class="ArticleTitle"><span class="ArticleTitleText">LED显示（动态扫描方式）的vhdl实现</span>
[转贴 2007-03-28 00:36:58 ]
发表者: cbqcgq
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<div id="BlogArticleDetail" style="font-size:14px;"><P>----------------**********************程序段*************************----------------</P>
<P> </P>
<P>library IEEE;<BR>use IEEE.STD_LOGIC_1164.ALL;<BR>use IEEE.STD_LOGIC_ARITH.ALL;<BR>use IEEE.STD_LOGIC_UNSIGNED.ALL;</P>
<P>---- Uncomment the following library declaration if instantiating<BR>---- any Xilinx primitives in this code.<BR>---- library UNISIM;<BR>---- use UNISIM.VComponents.all;</P>
<P>entity dynamic is <BR> Port ( clk,reset: in std_logic;<BR> din1 : in std_logic_vector(6 downto 0);--译码后的数据信号1 <BR> din2 : in std_logic_vector(6 downto 0); --译码后的数据信号2<BR> din3 : in std_logic_vector(6 downto 0); --译码后的数据信号3<BR> din4 : in std_logic_vector(6 downto 0); --译码后的数据信号4<BR> shift: out std_logic_vector(3 downto 0); --位选信号<BR> bus4 : out std_logic_vector(6 downto 0)); --数据信号<BR>end dynamic;</P>
<P>architecture Behavioral of dynamic is<BR>signal scan_clk:std_logic_vector(1 downto 0);<BR>begin<BR> process(clk,scan_clk,reset) --分频进程<BR> variable scan:std_logic_vector(17 downto 0);<BR> begin<BR> if reset='1' then scan:="000000000000000000";<BR> scan_clk<="00";<BR> elsif clk'event and clk='1'then scan:=scan+1;<BR> end if;<BR>-- scan_clk<=scan(1 downto 0); --this line for simulation<BR> scan_clk<=scan(17 downto 16) --work on 100MHz CLOCK<BR> end process; </P>
<P> process(scan_clk,din1,din2,din3,din4) --扫描进程<BR> begin<BR> case scan_clk is<BR> when "00"=> bus4<=din1;shift<="0001";<BR> when "01"=>bus4<=din2;shift<="0010";<BR> when "10"=>bus4<=din3;shift<="0100";<BR> when "11"=>bus4<=din4;shift<="1000";<BR> when others=> bus4<="0000000";shift<="0000";<BR> end case;<BR> end process; <BR>end Behavioral; </P>
<P>----------------********************************************************--------------------</P>
<P>----------------************testbanch.vhd*******************************--------------------</P>
<P>LIBRARY ieee;<BR>USE ieee.std_logic_1164.ALL;<BR>USE ieee.std_logic_unsigned.all;<BR>USE ieee.numeric_std.ALL;</P>
<P>ENTITY LED_dynamic_show_tb_vhd IS<BR>END LED_dynamic_show_tb_vhd;</P>
<P>ARCHITECTURE behavior OF LED_dynamic_show_tb_vhd IS </P>
<P> -- Component Declaration for the Unit Under Test (UUT)<BR> COMPONENT dynamic<BR> PORT(clk : IN std_logic;<BR> reset : IN std_logic;<BR> din1 : IN std_logic_vector(6 downto 0);<BR> din2 : IN std_logic_vector(6 downto 0);<BR> din3 : IN std_logic_vector(6 downto 0);<BR> din4 : IN std_logic_vector(6 downto 0); <BR> shift : OUT std_logic_vector(3 downto 0);<BR> bus4 : OUT std_logic_vector(6 downto 0));<BR> END COMPONENT;</P>
<P> --Inputs<BR> SIGNAL clk : std_logic := '0';<BR> SIGNAL reset : std_logic := '0';<BR> SIGNAL din1 : std_logic_vector(6 downto 0) := (others=>'0');<BR> SIGNAL din2 : std_logic_vector(6 downto 0) := (others=>'0');<BR> SIGNAL din3 : std_logic_vector(6 downto 0) := (others=>'0');<BR> SIGNAL din4 : std_logic_vector(6 downto 0) := (others=>'0');</P>
<P> --Outputs<BR> SIGNAL shift : std_logic_vector(3 downto 0);<BR> SIGNAL bus4 : std_logic_vector(6 downto 0);<BR> constant PERIOD : time := 10 ns;</P>
<P>BEGIN</P>
<P> -- Instantiate the Unit Under Test (UUT)<BR> uut: dynamic <BR> PORT MAP(clk => clk,<BR> reset => reset,<BR> din1 => din1,<BR> din2 => din2,<BR> din3 => din3,<BR> din4 => din4,<BR> shift => shift,<BR> bus4 => bus4);<BR> <BR> clk100MHz : PROCESS (clk)<BR> BEGIN<BR> clk <= not clk after PERIOD/2;<BR> END PROCESS;</P>
<P> <BR> tb : PROCESS<BR> BEGIN<BR> wait for 100 ns;<BR> reset <= '1' ;<BR> wait for 100 ns;<BR> reset <= '0';<BR> wait for 5.5*PERIOD;<BR> if (reset = '0') then<BR> report "Reset is deasserted...";<BR> end if;</P>
<P> if (reset = '0') then<BR> din1<="0000001";<BR> din2<="0000010";<BR> din3<="0000100";<BR> din4<="0001000";<BR> end if;<BR> <BR> -- Wait 100 ns for global reset to finish<BR> -- Place stimulus here<BR> wait; -- will wait forever<BR> END PROCESS;</P>
<P>END;</P>
<P>----------------********************************************************--------------------</P></div>
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