clock delay

[Altera_Forum]

Hi everyone,  

I'm asking how can I produce a time delay for exemple, I want to put a pin to the ground, then 1s later, I wanna put the second pin to the ground I was exemple of program like after or wait. But it seems I used them badly, it doesn't really work with me  Could anyone help me please? thank you very much

[Altera_Forum]

wait statements are only for simulation. If you want to synthesize your design you will have to create counters, which you check and based on their value you either bring a signal high or low.

[Altera_Forum]

Here is the synthesizeable code would help : 

 library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_arith.all;  entity delay_gen is (  nreset : in std_logic;  clock : in std_logic;  pin1 : out std_logic;  pin2 : out std_logic ); end entity delay_gen;   architecture behav of delay_gen is   type simple_fsm is (st1, st2);  signal state_trans : simple_fsm;  signal sec_count : std_logic_vector(10 downto 0); begin  delay_proc: process(nreset,clock)   begin  if(nreset = '0') then  state_trans <= st1;  sec_count <= (others=>'0');    elsif(rising_edge(clock)) then  case state_trans is  when st1 =>  pin1 <= '0'; -- Set to ground  sec_count <= x""; --Put the counter value w.r.t to the clock you select  state_trans <= st2;  when st2 =>  if(sec_count > 0) then --1 second counter has not elapsed   sec_count <= sec_count - 1; --decrement counter  state_trans <= state_trans; --continue to be there in same state  else  pin2 <= '0'; -- Set second pin to ground  state_trans <= st1;  end if;  when others =>  sec_count <= x"" --Put the counter value w.r.t to the clock you select  pin1 <= '1'; --Keep pin1 at VCC  pin2 <= '1'; --Keep pin1 at VCC  end case;  end if;  end process delay_proc; end architecture behav;

[Altera_Forum]

Thank you for your replying, but it seems I met some problem with that code, what should I put instead of x""? I put 1000 instead and it doesn' work

[Altera_Forum]

--- Quote Start ---  Thank you for your replying, but it seems I met some problem with that code, what should I put instead of x""? I put 1000 instead and it doesn' work  --- Quote End ---    You need to put the value that will divide the clock to give you 1 second pulses. So if you have a 50mhz clock, you need to set the value to 50000000 (x"02FAF080") - you would also need a larger counter.