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Ahh, my fault - try:
rising_edge(clk)
instead of
rising_edge (clk)
Sorry about that. I was trying to preserve your code format and didn't notice.
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I appreciate your effort to help me, thank you very much, now, the problem is the same. I put here the code after your guide:
library IEEE;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity multi_display_system is port (
rst, clk : in std_logic;
d7s : out std_logic_vector (7 downto 0);
An : out std_logic_vector (3 downto 0)
);
end multi_display_system;
architecture mixed of multi_display_system is
signal addr_bin : std_logic_vector (3 downto 0);
signal count_2b : std_logic_vector (1 downto 0);
signal count : std_logic_vector (24 downto 0);
signal slow_clk : std_logic;
begin
process (count_2b)
begin
case count_2b is
when "00" => addr_bin <= "0000";
when "01" => addr_bin <= "1001";
when "10" => addr_bin <= "1010";
when "11" => addr_bin <= "1111";
when others => null;
end case;
end process;
d7s <= "11000000" when addr_bin = "0000" else
"11111001" when addr_bin = "0001" else
"10100100" when addr_bin = "0010" else
"10110000" when addr_bin = "0011" else
"10011001" when addr_bin = "0100" else
"10010010" when addr_bin = "0101" else
"10000010" when addr_bin = "0110" else
"11111000" when addr_bin = "0111" else
"10000000" when addr_bin = "1000" else
"10010000" when addr_bin = "1001" else
"10001000" when addr_bin = "1010" else
"10000011" when addr_bin = "1011" else
"11000110" when addr_bin = "1100" else
"10100001" when addr_bin = "1101" else
"10000110" when addr_bin = "1110" else
"10001110";
process (clk,count)
begin --rising_edge(clk)
if rising_edge(clk) then count <= count +1;
end if;
-- the frequency of slow_clk is 1.49 Hz for clk = 50 MHz (50 M / 2^16 Hz = 762.94)
-- slow_clk <= count(15) ; -- display without flicker
end process;
process (rst, slow_clk)
begin
if rst = '1' then count_2b <= "00";
else if rising_edge(slow_clk) then count_2b <= count_2b +1;
end if;
end process;
process (count_2b)
begin
case count_2b is
when "00" => AN <= "1110"; -- Lights only display 0
when "01" => AN <= "1101"; -- Lights only display 0
when "10" => AN <= "1011"; -- Lights only display 0
when "11" => AN <= "0111"; -- Lights only display 0
when others => null;
end case;
end process;
end mixed;
by the way: how do you put the code in this forum using a scrolling text box?
Honored Contributor
