wait statement inside process

[Altera_Forum]

Hi all,  

 I faced some problem when I trying to compile my following code. The error replied was only one wait statement is allowed in the process. I have tried putting IF statement but it took 10,000 iterations. May I know how can i change my code?   Main : process  variable counter : counter_type := 0;  begin  -- HWY green, SRD red   wait on (CLOCK until CLOCK = '1' and SRDcar = '1');    if (HWYcar = '1') then   Counter := 0;  loop  wait until CLOCK = '1';  exit when (HWYcar = '0' or Counter = long_cycle);  Counter := Counter + 1;  end loop;  end if ;  Thank you so much

[Altera_Forum]

Main : process 

variable counter : counter_type := 0;  begin if rising_edge(CLOCK) then  if SRDcar = '1' then  if HWYcar = '1' then  counter := 0;  elsif counter = long_cycle then  null;  else  counter := counter + 1;  end if;  end if; end if; end process;  I think this should be something like what you want.   Ben

[Altera_Forum]

thank you ben. but the error return now is rising_edge is used but not declared. sorry for bothering. I'm very very new this software.

[Altera_Forum]

Have you included the std_logic_1164 library because that is where the rising_edge function is declared. 

 use ieee.std_logic_1164.all;

[Altera_Forum]

yup... i included that...  

 library ieee; use ieee.std_logic_1164.all;  was trying to figure this out for the past 2 days...

[Altera_Forum]

You can replace "if rising_edge(CLOCK) then" with "if CLOCK'event and CLOCK = '1' then" or you open the std_logic_1164 library and check that the rising_edge function is in there.

[Altera_Forum]

thank you so much for yr help mate. good luck :)

[Altera_Forum]

--- Quote Start ---  I'm very very new this software.  --- Quote End ---     You might benefit from references suggested at http://www.alteraforum.com/forum/showthread.php?t=1025. Start with the coding style guidelines in the Quartus handbook and the examples in the Quartus text editor templates.