multiple constant drivers error

Ok thanks, I agree with you; and I havn't the constant drivers error BUT,

in "tools/netlist viewer/state machine viewer"

I get somthing which is suspect. I try with only 3 states and I saw that the "when" in my case dont stop. That's make a big looping which never stop.

the code:

architecture Struct_LCD of LCD is 
type ETAT is (RESET,ECRITURE1,ECRITURE2);
Signal etat_pres, etat_suiv : ETAT := RESET;
begin
Process(clock)
begin
if(clock'event and clock = '1') then etat_pres <= etat_suiv;
end if;
end process;
Process(etat_pres,etat_suiv)
begin
case etat_pres is
				
	when RESET =>
	LCD_ON<='1';
	etat_suiv <=ECRITURE1;
		
	when ECRITURE1 =>	
	LCD_EN<= '1';
	LCD_ON<='1';
	LCD_Data <= x"01";
	etat_suiv <=ECRITURE2;
	
	when ECRITURE2 =>
	LCD_EN<= '0';
	LCD_ON<='1';
	LCD_Data <= x"01";
	
			
	end case;
end process;
	
end Struct_LCD ;

and the diagramm is:

http://img167.imageshack.us/img167/4314/lcd0rz0.th.jpg (http://img167.imageshack.us/my.php?image=lcd0rz0.jpg)

and I want:

http://img441.imageshack.us/img441/5025/lcd1jg6.th.jpg (http://img441.imageshack.us/my.php?image=lcd1jg6.jpg)

thanks for your help!