各位大神帮忙看看，我的代码哪里有问题
process(lcd_clk)
begin

lcd_on<='1';
lcd_blon<='0';
if(lcd_clk'event and lcd_clk='1') then
rw<='0';
en<=lcd_clk;
case next1 is
when state0=>rs<='0';date<="00000001";next1<=state1;
when state1=>rs<='0';date<="00111000";next1<=state2;
when state2=>rs<='0';date<="00001100";next1<=state3;
when state3=>rs<='0';date<="00000110";next1<=state4;
when state4=>rs<='0';date<="10000000";next1<=date0;
when date0=>rs<='1';date<="10100000";next1<=date1;
when date1=>rs<='1';date<="10100000";next1<=date2;
when date2=>rs<='1';date<="10100000";next1<=date3;
when date3=>rs<='1';date<="10100000";next1<=date4;
when date4=>rs<='1';date<="00101101";next1<=date5;
when date5=>rs<='1';date<="10100000";next1<=date6;
when date6=>rs<='1';date<="10100000";next1<=date7;
when date7=>rs<='1';date<="00101101";next1<=date8;
when date8=>rs<='1';date<="10100000";next1<=date9;
when date9=>rs<='1';date<="10100000";next1<=date10;
when date10=>rs<='1';date<="10100000";next1<=date11;
when date11=>rs<='1';date<="10100000";next1<=date12;
when date12=>rs<='1';date<="10100000";next1<=date13;
when date13=>rs<='1';date<="10100000";next1<=date14;
when date14=>rs<='1';date<="10100000";next1<=date15;
when date15=>rs<='1';date<="10100000";next1<=date16;
when date16=>rs<='1';date<="01000011";next1<=date17;
when date17=>rs<='1';date<="01001100";next1<=date18;
when date18=>rs<='1';date<="01001111";next1<=date19;
when date19=>rs<='1';date<="01000011";next1<=date20;
when date20=>rs<='1';date<="01001011";next1<=date21;
when date21=>rs<='1';date<="00111010";next1<=date22;
when date22=>rs<='1';date<="10100000";next1<=date23;
when date23=>rs<='1';date<="10100000";next1<=date24;
when date24=>rs<='1';date<="00111010";next1<=date25;
when date25=>rs<='1';date<="10100000";next1<=date26;
when date26=>rs<='1';date<="10100000";next1<=date27;
when date27=>rs<='1';date<="00111010";next1<=date28;
when date28=>rs<='1';date<="10100000";next1<=date29;
when date29=>rs<='1';date<="10100000";next1<=date30;
when date30=>rs<='1';date<="10100000";next1<=date31;
when date31=>rs<='1';date<="10100000";next1<=scan;
when scan=>next1<=state4;
when others=>date<="00000000";rs<='0';next1<=state0;
end case;
end if;

end process;