我不明白，模拟在“taster”信号变为“1”后停止，不知道为什么。在 Xilinx IDE 封装测试台中。
entity komb is
Port ( reset : in STD_LOGIC;
clk : in STD_LOGIC;
levo_ndesno : in STD_LOGIC;
dogadjaj : in STD_LOGIC;
taster : in STD_LOGIC;
tr_cifra : out STD_LOGIC_VECTOR (3 downto 0);
cifra : out STD_LOGIC_VECTOR (6 downto 0);
otvori : out STD_LOGIC;
greska : out STD_LOGIC);
end komb;
architecture Behavioral of komb is
type tab is array(0 to 9) of std_logic_vector(6 downto 0);
signal tabela_cifara : tab;
type niz is array(0 to 3) of integer;
signal sifra : niz;
signal tr_sif : niz;
type state_type is (s12, s11, s10, s9, s8, s7, s6, s5, s4, s3, s2, s1, s0);
signal state_reg, next_state : state_type;
signal cnt_cif : integer;
constant fclk : integer := 1;
constant jedna_sekunda : integer := 10*fclk;
signal counter : integer;
begin
sifra(3) <= 3;
sifra(2) <= 5;
sifra(1) <= 9;
sifra(0) <= 2;
state_transition: process(clk, reset)
begin
if (reset = '1') then
state_reg <= s0;
elsif (clk'event and clk = '1') then
state_reg <= next_state;
end if;
end process;
counter_process : process(clk, reset, state_reg, counter)
begin
if (reset = '1') then
counter <= jedna_sekunda;
else
if(clk'event and clk='1') then
if (state_reg = s12) then
if (counter = 0) then
counter <= jedna_sekunda;
else
counter <= counter - 1;
end if;
end if;
end if;
end if;
end process;
next_state_logic: process(state_reg, dogadjaj, taster, cnt_cif, levo_ndesno, counter)
begin
case state_reg is
when s0 =>
if (dogadjaj = '0') then
next_state <= s0;
else
next_state <= s1;
end if;
when s1 =>
if (taster = '1') then
next_state <= s11;
else
if (levo_ndesno = '1') then
next_state <= s2;
else
next_state <= s3;
end if;
end if;
when s2 =>
if (taster = '1') then
next_state <= s11;
else
if (levo_ndesno = '1') then
next_state <= s4;
else
next_state <= s1;
end if;
end if;
when s3 =>
if (taster = '1') then
next_state <= s11;
else
if (levo_ndesno = '1') then
next_state <= s1;
else
next_state <= s5;
end if;
end if;
when s4 =>
if (taster = '1') then
next_state <= s11;
else
if(levo_ndesno = '1') then
next_state <= s6;
else
next_state <= s2;
end if;
end if;
when s5 =>
if (taster = '1') then
next_state <= s11;
else
if(levo_ndesno = '1') then
next_state <= s3;
else
next_state <= s7;
end if;
end if;
when s6 =>
if (taster = '1') then
next_state <= s11;
else
if (levo_ndesno = '1') then
next_state <= s8;
else
next_state <= s4;
end if;
end if;
when s7 =>
if (taster = '1') then
next_state <= s11;
else
if (levo_ndesno = '1') then
next_state <= s5;
else
next_state <= s9;
end if;
end if;
when s8 =>
if (taster = '1') then
next_state <= s11;
else
if (levo_ndesno = '1') then
next_state <= s10;
else
next_state <= s6;
end if;
end if;
when s9 =>
if (taster = '1') then
next_state <= s11;
else
if (levo_ndesno = '1') then
next_state <= s7;
else
next_state <= s10;
end if;
end if;
when s10 =>
if (taster = '1') then
next_state <= s11;
else
if (levo_ndesno = '1') then
next_state <= s9;
else
next_state <= s8;
end if;
end if;
when s11 =>
if (cnt_cif < 4) then
next_state <= s1;
else
next_state <= s12;
end if;
when s12 =>
if (counter = 0) then
next_state <= s0;
else
next_state <= s12;
end if;
end case;
end process;
output_logic: process(state_reg, cnt_cif, tabela_cifara)
variable xxcif : integer;
begin
case state_reg is
when s0 =>
cifra <= tabela_cifara(0);
cnt_cif <= 1;
otvori <= '0';
greska <= '0';
tr_cifra <= "0001";
tr_sif(0) <= 0;
tr_sif(1) <= 0;
tr_sif(2) <= 0;
tr_sif(3) <= 0;
when s1 =>
cifra <= tabela_cifara(0);
xxcif := 0;
case cnt_cif is
when 1 =>
tr_cifra <= "0001";
when 2 =>
tr_cifra <= "0011";
when 3 =>
tr_cifra <= "0111";
when 4 =>
tr_cifra <= "1111";
when others =>
tr_cifra <= "0000";
end case;
when s2 =>
cifra <= tabela_cifara(9);
xxcif := 9;
when s3 =>
cifra <= tabela_cifara(1);
xxcif := 1;
when s4 =>
cifra <= tabela_cifara(8);
xxcif := 8;
when s5 =>
cifra <= tabela_cifara(2);
xxcif := 2;
when s6 =>
cifra <= tabela_cifara(7);
xxcif := 7;
when s7 =>
cifra <= tabela_cifara(3);
xxcif := 3;
when s8 =>
cifra <= tabela_cifara(6);
xxcif := 6;
when s9 =>
cifra <= tabela_cifara(4);
xxcif := 4;
when s10 =>
cifra <= tabela_cifara(5);
xxcif := 5;
when s11 =>
tr_sif(cnt_cif-1) <= xxcif;
cnt_cif <= cnt_cif + 1;
when s12 =>
cifra <= tabela_cifara(0);
if ((tr_sif(0) = sifra(0)) and (tr_sif(1) = sifra(1)) and (tr_sif(2) = sifra(2)) and (tr_sif(3) = sifra(3))) then
otvori <= '1';
else
greska <= '1';
end if;
end case;
end process;
tabela_cifara(0) <= "1111110";
tabela_cifara(1) <= "0110000";
tabela_cifara(2) <= "1101101";
tabela_cifara(3) <= "1111001";
tabela_cifara(4) <= "0110011";
tabela_cifara(5) <= "1011011";
tabela_cifara(6) <= "1011111";
tabela_cifara(7) <= "1110000";
tabela_cifara(8) <= "1111111";
tabela_cifara(9) <= "1111011";
end Behavioral;
这是我的简单测试台程序：
stim_proc: process
begin
-- hold reset state for 100 ns.
reset <= '1';
wait for 10 ns;
reset <= '0';
wait for 10 ns;
-- insert stimulus here
dogadjaj <= '1';
wait for clk_period;
dogadjaj <= '0';
wait for 10 ns;
levo_ndesno <= '1';
wait for 100ns;
taster <= '1';
wait for 10ns;
--taster <= '0';
wait for 200ns;
end process;
请帮忙 ：）