measure period of impulse!

First what range of periods would you need to measure and second what frequency clocks do you have available?

Thanks! and you can for me VHDL code in common! with clock period is 10MHz and range of range of period is from 50 us 5000 us.

Here's a basic code template. Signal and port definitions are left up to you.

process (clk)
begin
if rising_edge(clk) then
  pulse_inp_sync <= pulse_inp;
  pulse_inp_prev <= pulse_inp_sync;
  if (not pulse_inp_prev and pulse_inp_sync ) = '1' then
    counter <= (others => '0');
    period <=  counter;
  elsif counter < MAXCOUNT then
    counter <= counter + 1;
  end if;
end if;
end process;

Thanks! But you can draw for me timing schematic?

Thanks! FvM. I have completed measure period of pulse. And now I have a question: Everyone, Who used DDR2 SDRAM in DSP development Kit Cyclone II Ep2c35F672C6?