ledcontrol.vhd

描述：LED示范、按钮及开关、视频输出、键入、含Xilinx PicoBlaze微处理器的存储器模块

--This controls the 8 LEDs on the board
--You can specify a filling factor for each LED, which by PWM is converted to brightness
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity LedControl is
	 generic ( pwm_precision: positive := 8 );
    Port ( --Each of the following inputs specify the brightness of one
	 		  --of the LEDs. 0x00 means completly off, 0xFF means full
			  --brightness
	        LED0_IN : in std_logic_vector(pwm_precision-1 downto 0);
           LED1_IN : in std_logic_vector(pwm_precision-1 downto 0);
           LED2_IN : in std_logic_vector(pwm_precision-1 downto 0);
           LED3_IN : in std_logic_vector(pwm_precision-1 downto 0);
           LED4_IN : in std_logic_vector(pwm_precision-1 downto 0);
           LED5_IN : in std_logic_vector(pwm_precision-1 downto 0);
           LED6_IN : in std_logic_vector(pwm_precision-1 downto 0);
           LED7_IN : in std_logic_vector(pwm_precision-1 downto 0);
           CLK : in std_logic;
			  RESET : in std_logic;
           LED_OUT : out std_logic_vector(7 downto 0));
end LedControl;

architecture Behavioral of LedControl is
	component LimitCounter is
		generic ( element_width: positive := pwm_precision);	
    	Port ( RESET : in std_logic;
             CLK : in std_logic;
		       SWITCH_LIMIT : in std_logic_vector(element_width-1 downto 0);           
             OUTPUT_SIGNAL : out std_logic);
	end component;
begin
	pwm0: LimitCounter port map (
		RESET => RESET,
		CLK => CLK,
		SWITCH_LIMIT => LED0_IN,
		OUTPUT_SIGNAL => LED_OUT(0) );

	pwm1: LimitCounter port map (
		RESET => RESET,
		CLK => CLK,
		SWITCH_LIMIT => LED1_IN,
		OUTPUT_SIGNAL => LED_OUT(1) );

	pwm2: LimitCounter port map (
		RESET => RESET,
		CLK => CLK,
		SWITCH_LIMIT => LED2_IN,
		OUTPUT_SIGNAL => LED_OUT(2) );

	pwm3: LimitCounter port map (
		RESET => RESET,
		CLK => CLK,
		SWITCH_LIMIT => LED3_IN,
		OUTPUT_SIGNAL => LED_OUT(3) );

	pwm4: LimitCounter port map (
		RESET => RESET,
		CLK => CLK,
		SWITCH_LIMIT => LED4_IN,
		OUTPUT_SIGNAL => LED_OUT(4) );

	pwm5: LimitCounter port map (
		RESET => RESET,
		CLK => CLK,
		SWITCH_LIMIT => LED5_IN,
		OUTPUT_SIGNAL => LED_OUT(5) );

	pwm6: LimitCounter port map (
		RESET => RESET,
		CLK => CLK,
		SWITCH_LIMIT => LED6_IN,
		OUTPUT_SIGNAL => LED_OUT(6) );

	pwm7: LimitCounter port map (
		RESET => RESET,
		CLK => CLK,
		SWITCH_LIMIT => LED7_IN,
		OUTPUT_SIGNAL => LED_OUT(7) );		
end Behavioral;