10 second timer

[Altera_Forum]

-I'm trying to make a 10 seconde timer for parking lot "gate", and i need to use a variable (s_count) on a diferente fase of the work (i need to use a sensor that says's if there's a car entering in the parkig lot while the "gate" is still open, and if ther's a car then it stops countig and only start's again when the sensor = '0' (no car) ), and i don't know how, and i could use some help. 

Thank you in advance  This is my code so far :  cancela = gate  valida = validation of a card thet gives access to the park.  library IEEE; use IEEE.STD_LOGIC_1164.all; use IEEE.numeric_std.all; use ieee.std_logic_unsigned.all;  entity Fase1 is   Port (valida: in std_logic; Clk: in std_logic; start: in std_logic; cancela: out std_logic; timerOut: out std_logic); end Fase1;   architecture RTL of Fase1 is  signal s_cancela : std_logic;  signal s_count : integer := 0;  begin   process(Clk)   begin   if(valida = '1') then   s_cancela <= '1';   if(s_cancela = '1') then   if (start='0') then   s_count <= 0;   timerOut <= '1';   else   if (rising_edge(CLK)) then   if (s_count<=500000000) then   s_count <= s_count+1;   else   timerOut <= '0';   end if; end if; end if; end if;   elsif(valida = '0') then   s_cancela <= '0';   timerOut <= '0';   end if;   cancela <= s_cancela;   end process;  end RTL;

[Altera_Forum]

I recommend you reformat the code into the recommended process template. Currently your code is missing signals from the sensitivity list so that it's behaviour in simulation will not match that of the real hardware. The asynchronous reset template is: 

  process(clk, rst) --rst must be included in here for async reset begin if reset = '1' then --reset stuff elsif rising_edge(clk) then --do logic stuff here end if; --note NOTHING goes here end process; --output assignments go outside the process   Other than that - what problems are you having? have you created a testbench and tried to simulate the design to help you debug it?