vhdl多功能電子秒表程序

ID:112317 · 發(fā)表于 2016-4-7 01:15

vhdl編的多功能電子秒表，可以記錄幾個(gè)人的時(shí)間，并且可以在跑秒的時(shí)候查看記錄。

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
use ieee.std_logic_arith.all;
entity clock is
port( cp:in std_logic;
minten: out std_logic_vector(3 downto 0);
min : out std_logic_vector(3 downto 0);
secten: out std_logic_vector(3 downto 0);
sec: out std_logic_vector(3 downto 0);
stop: in std_logic;
reset: in std_logic;
lamp: out std_logic;
lam: out std_logic;
read: in std_logic);
end clock;
architecture a of clock is
signal mten: integer range 0 to 9;
signal m: integer range 0 to 9;
signal sten: integer range 0 to 9;
signal ss: integer range 0 to 9;
signal read_signal:integer range 0 to 3;
signal ta : integer range 0 to 10;
signal tb : integer range 0 to 10;
signal tc : integer range 0 to 10;
signal td : integer range 0 to 10;
signal xa : integer range 0 to 10;
signal xb : integer range 0 to 10;
signal xc : integer range 0 to 10;
signal xd : integer range 0 to 10;
signal stop_signal: std_logic;
begin
-------------------stop_signal---------------
process(stop)
begin
if stop'event and stop='1' then
stop_signal<=not stop_signal;
end if;
end process;
------------------clock goes------------------
process(cp)
begin
if cp'event and cp='1' then
if reset='0' then
if stop_signal='1' then
if ss=9 then
ss<=0;
if sten=5 then
sten<=0;
if m=9 then
m<=0;
if mten=5 then
mten<=0;
else mten<=mten+1;
end if;
else m<=m+1;
end if;
else sten<=sten+1;
end if;
else ss<=ss+1;
end if;
end if;
else mten<=0;
m<=0;
sten<=0;
ss<=0;
end if;
end if;
end process;
------------------------------read_signal-----------
process(read)
begin
if read'event and read='1' then
if read_signal=2 then read_signal<=0 ;else read_signal<=read_signal+1 ; end if ;
end if;
end process;
--------------------record--------------
process(read_signal)
begin
if stop_signal='1' then
case read_signal is
when 1=> ta<=ss;tb<=sten; tc<=m; td<=mten;lamp<='1';lam<='0';
when 2=> xa<=ss;xb<=sten; xc<=m; xd<=mten;lam<='1'; lamp<='0';
when others => lamp<='0' ;lam<='0';
end case;
end if;
end process;
------------------------display--------------
process(cp,read_signal)
begin
case read_signal is
when 1=>if stop_signal='0' then
minten<=conv_std_logic_vector(td,4);
min<=conv_std_logic_vector(tc,4);
secten<=conv_std_logic_vector(tb,4);
sec<=conv_std_logic_vector(ta,4);
end if;
when 2=>
if stop_signal='0' then
minten<=conv_std_logic_vector(xd,4);
min<=conv_std_logic_vector(xc,4);
secten<=conv_std_logic_vector(xb,4);
sec<=conv_std_logic_vector(xa,4);
end if;
when others=>
minten<=conv_std_logic_vector(mten,4);
min<=conv_std_logic_vector(m,4);
secten<=conv_std_logic_vector(sten,4);
sec<=conv_std_logic_vector(ss,4);
end case;
end process;
end a;

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vhdl多功能電子秒表程序