文档介绍：密码锁设计
密码锁设计顶层电路图
(2)顶层时序仿真
分频模块
(1)10分频程序
library ieee;
use ;
use ;
entity yourname_div10 is
port(clk:in std_logic;
co:out std_logic);
end ;
architecture behav of yourname_div10 is
signal count:std_logic_vector(3 downto 0);
begin
process(clk)
begin
if clk'event and clk='1'then
if count="1001"then
count<="0000";
co<='1';
else
count<=count+1;
co<='0';
end if;
end if;
end process;
end behav;
(2)5分频程序
library ieee;
use ;
use ;
entity yourname_div5 is
port(clk:in std_logic;
co:out std_logic);
end;
architecture behav of yourname_div5 is
signal count:std_logic_vector(2 downto 0);
begin
process(clk)
begin
if clk'event and clk='1'then
if count="100"then
count<="000";
co<='1';
else
count<=count+1;
co<='0';
end if;
end if;
end process;
end behav;
(3)10分频时序仿真波形
(4)5分频时序仿真波形
从以上波形仿真可以看出该板块10分频模块的输出是输入信号的10分频,同理5分频的输出是输入信号的5分频。
附录三:消抖模块
(1)消抖模块程序
library ieee;
use ;
use ;
entity yourname_xiaodou is
port(clk_1k:in std_logic;
keyin:in std_logic;
keyout:out std_logic);
end ;
architecture behav of yourname_xiaodou is
signal n:integer range 0 to 29;
begin
process(clk_1k)
begin
if keyin='1' then
n<=0;
keyout<='1';
elsif clk_1k'event and clk_1k='1' then
if n<29 then
n<=n+1;
keyout<='1';
else
n<=29;
keyout<='0';
end if;
end if;
end process;
end behav;
(2)仿真波形
附录四:输入模块
(1)输入模块程序
library ieee;
use ;
use ;
entity yourname_count10 is
port(clk:in std_logic;
bcd:buffer std_logic_vector(3 downto 0));
end ;
architecture behav of yourname_count10 is
begin
process(clk)
begin
if clk'event and clk='1' then
if bcd="1001"then
bcd<="0000";
else
bcd<=bcd+'1';
end if;
end if;
end process;
end behav;
library