dongtai8duankou.vhd

8位十进制频率计,通过验证,目标芯片EPF10KLC84-4

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
ENTITY dongtai8duankou IS
	PORT(
		clk		: IN	STD_LOGIC;
       p1,p2,p3,p4,p5,p6,p7,p8	: IN	STD_LOGIC_VECTOR(3 downto 0);
		wei	: OUT	STD_LOGIC_VECTOR(7 downto 0);
		duan	: OUT	STD_LOGIC_VECTOR(7 downto 0));
END ;

ARCHITECTURE a OF dongtai8duankou IS
   	SIGNAL count : STD_LOGIC_VECTOR(2 downto 0);
	SIGNAL temp : STD_LOGIC_VECTOR(3 downto 0);
	

BEGIN

PROCESS (clk)
BEGIN
IF clk'event and clk='1' THEN
    count<=count+1;
END IF;
END PROCESS ;

process(count)
begin
case count is
when "000"=>wei<="00000001";
when "001"=>wei<="00000010";
when "010"=>wei<="00000100";
when "011"=>wei<="00001000";
when "100"=>wei<="00010000";
when "101"=>wei<="00100000";
when "110"=>wei<="01000000"; 
when "111"=>wei<="10000000" ;
when others=>	NULL;
end case;
end process;


process(count)
begin
case count is
when "000"=>temp<=p1(3 downto 0);
when "001"=>temp<=p2(3 downto 0);
when "010"=>temp<=p3(3 downto 0);
when "011"=>temp<=p4(3 downto 0);
when "100"=>temp<=p5(3 downto 0);
when "101"=>temp<=p6(3 downto 0);
when "110"=>temp<=p7(3 downto 0); 
when "111"=>temp<=p8(3 downto 0);
when others=>	NULL;
end case;
end process;


process(temp)
begin
case temp is
when "0000"=>duan<="11111100";
when "0001"=>duan<="01100000";
when "0010"=>duan<="11011010";
when "0011"=>duan<="11110010";
when "0100"=>duan<="01100110";
when "0101"=>duan<="10110110";
when "0110"=>duan<="10111110"; 
when "0111"=>duan<="11100000";
WHEN "1000"=>duan<="11111110";
WHEN "1001"=>duan<="11110110";
WHEN "1010"=>duan<="11101110";
WHEN "1011"=>duan<="10011100";
WHEN "1101"=>duan<="01111010";
WHEN "1110"=>duan<="10011110";
WHEN "1111"=>duan<="10001110";
WHEN OTHERS=>NULL;
end case;
end process;

END a;