首先抱歉我的英语不好，希望你能理解我的问题
我有一个项目“定时炸弹”。我使用键盘和Nexys 3 FPGA。 我必须单击两个数字，例如1和2，并通过键盘上的定义数字或字母进行确认。然后它必须显示在7段显示并开始倒计数到0. 12,11,10,9 ... 0.我没有问题点击一个数字（0-9）并显示它，但问题是我想显示两位数（10-99）。我按下1并确定它显示在两个7段显示器上。然后我按2并显示两段显示，但我只想显示在一块上。所以我有结果22，但我想看21或12这取决于我们假设的惯例。 两个评论过程是我们尝试这样做但没有奏效。
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use ieee.std_logic_unsigned.all;
-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
--use IEEE.NUMERIC_STD.ALL;
-- Uncomment the following library declaration if instantiating
-- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;
entity mojaklaw is
Port (SEG : out std_logic_vector(6 downto 0); -- segmenty wyświetlacza
DP : out std_logic; -- kropki na wyswietlaczu
ENABLE : out std_logic_vector(3 downto 0); -- anody wyswietlacza
CLK : in std_logic; -- zegar
ROW : in std_logic_vector(3 downto 0); -- rzad klawiatury
COL : buffer std_logic_vector(3 downto 0); -- kolumna klawiatury
LEDS : out std_logic_vector(3 downto 0) ); -- diody led
end mojaklaw;
architecture Behavioral of mojaklaw is
signal Q : std_logic_vector(22 downto 0); -- 4-bitowy licznik sterujacy
signal KeyCode : std_logic_vector(3 downto 0); -- kod przycisku klawiatury
signal KeyCode1 : std_logic_vector(3 downto 0); -- kod przycisku klawiatury 2
signal DIGIT : std_logic_vector(3 downto 0); -- konwersja kodu klawiatury
signal En : std_logic; -- '0' oznacza wcisniety przycisk klawiatury
begin
DP<='1'; -- wygaszenie kropek (dots turn off)
process(CLK) begin -- 4-bit COUNTER
if rising_edge(CLK) then
if En='1' then Q<=Q+1; end if;
end if;
end process;
with Q(20 downto 19) select -- MUX
En<= ROW(0) when "00", ROW(1) when "01", ROW(2) when "10", ROW(3) when "11", '1' when others;
with Q(22 downto 21) select -- DECODER
COL<= "1110" when "00", "1101" when "01", "1011" when "10", "0111" when "11", "1111" when others;
--process(CLK) begin -- REGISTER
--if rising_edge(CLK) then
--if En='0' then KeyCode<=Q(22 downto 19); Q2<='1'; end if;
--if Q2='1' then if En='0' then KeyCode1<=KeyCode; end if;
--else KeyCode1<="1111"; end if;
--end if;
----end process;
--process (CLK)
-- variable Q2 : integer;
--begin
--if rising_edge(CLK) then
--if Q2=1 then
--if En='0' then KeyCode1<=KeyCode; Q2:=0; end if;
--else
--if En='0' then KeyCode<=Q(22 downto 19); Q2:=1; end if;
--end if; -- if Q2
--end if; -- if edge
--end process;
process(CLK) begin -- REGISTER keycode
if rising_edge(CLK) then
if En='0' then KeyCode<=Q(22 downto 19);
end if; end if;
end process;
-- MUX 7SEGMENT LCD
with Q(17 downto 16) select
DIGIT <= KeyCode when "00", KeyCode1 when "01", "1111" when "10", "1111" when others;
-- CONVERTER 7SEGMENT LCD konwersja kodu klawiatury na wyswietlacz 7segmentowy
process(DIGIT) begin
case DIGIT is
when "0011" => SEG <= "0000001"; -- 0
when "0000" => SEG <= "1001111"; -- 1
when "0100" => SEG <= "0010010"; -- 2
when "1000" => SEG <= "0000110"; -- 3
when "0001" => SEG <= "1001100"; -- 4
when "0101" => SEG <= "0100100"; -- 5
when "1001" => SEG <= "0100000"; -- 6
when "0010" => SEG <= "0001111"; -- 7
when "0110" => SEG <= "0000000"; -- 8
when "1010" => SEG <= "0000100"; -- 9
when others => SEG <= "1111111"; -- -
end case;
end process;
-- DECODER 7SEGMENT LCD
with Q(17 downto 16) select
ENABLE <= "1110" when "00", "1101" when "01",
"1011" when "10", "0111" when others ;
end Behavioral;
此处是我们的密码分配：
NET "CLK" LOC="V10"; # CLK
NET "COL(3)" LOC="H3"; # JC1
NET "COL(2)" LOC="L7"; # JC2
NET "COL(1)" LOC="K6"; # JC3
NET "COL(0)" LOC="G3"; # JC4
NET "ROW(3)" LOC="G1"; # JC7
NET "ROW(2)" LOC="J7"; # JC8
NET "ROW(1)" LOC="J6"; # JC9
NET "ROW(0)" LOC="F2"; # JC10
NET "SEG(6)" LOC="T17"; # A
NET "SEG(5)" LOC="T18"; # B
NET "SEG(4)" LOC="U17"; # C
NET "SEG(3)" LOC="U18"; # D
NET "SEG(2)" LOC="M14"; # E
NET "SEG(1)" LOC="N14"; # F
NET "SEG(0)" LOC="L14"; # G
NET "DP" LOC="M13"; #DP
NET "ENABLE(3)" LOC="P17"; #AN3
NET "ENABLE(2)" LOC="P18"; #AN2
NET "ENABLE(1)" LOC="N15"; #AN1
NET "ENABLE(0)" LOC="N16"; #AN0
NET "LEDS(3)" LOC="V15"; # LD3
NET "LEDS(2)" LOC="U15"; # LD2
NET "LEDS(1)" LOC="V16"; # LD1
NET "LEDS(0)" LOC="U16"; # LD0