vhdl呼吸灯源码

最新推荐文章于 2024-01-31 00:00:17 发布

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最新推荐文章于 2024-01-31 00:00:17 发布

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分类专栏：个人代码片段文章标签： vhdl fpga

本文链接：https://blog.youkuaiyun.com/a1a38181/article/details/52937613

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;


entity led is 
port (
clkin:in std_logic;
clkout:out std_logic
);
end entity;
architecture behave of led is 
signal mlow:std_logic_vector(9 downto 0);
signal mhigh:std_logic_vector(15 downto 0);
signal mcur:std_logic_vector(15 downto 0);
signal mtype:std_logic;
begin 
process(clkin)
begin 
	if(clkin'event and clkin='1')then
		mcur<=mcur+1;
		if(mcur="1111111111111111")then 
		mhigh<=(others=>'0');
		mcur<=(others=>'0');
		end if;
		mlow <=mlow+1;
		if(mlow="1111111111")then
			mlow<=(others=>'0');
			mhigh<=mhigh+1;
	    end if;
		if(  mhigh="1111111111111111")then
			mhigh<=(others=>'0');
			mtype<=not mtype;
		end if;
		if(mtype='1')then 
			if(mcur > mhigh)then 
			clkout<='1';
			else
			clkout<='0';
			end if;
		else
			if(mcur > mhigh)then 
			clkout<='0';
			else
			clkout<='1';
			end if;
		end if;
		
		
		--t_o<