ram not working correctly

hi ..

the fpga and vhdl master ...

I want to ask about the ram ... I have a little problem in the call data that are saved on ram ... when I try to testbench or i simulate in single block outgoing data is correct, but when the block I combine and i synthesis in quartus then i run in modelsim Altera with data such as skipped out ..

==============================================================================

-- 2D ram

subtype p_simb is std_logic_vector(7 downto 0);

type t_simb is array(1 to 257) of p_simb;

-- deklarasi sinyal ram

signal ram_kor : t_simb;

BEGIN

process (rst,clk)

begin

if rst= '0' then << problem1

sig_pros <= '0';

Dec_codword_out <= "00000000";

cnt4wraddr <= 1;

cnt4rdaddr <= 1;

ram_kor <= (others=>"UUUUUUUU"); << problem2

elsif (rising_edge(clk)) then

last_state <= enb_dec;

last_state2 <= sig_pros;

if enb_dec = '1' then

cnt4wraddr <= cnt4wraddr + 1;

ram_kor(cnt4wraddr) <= Dec_Din;

else

cnt4wraddr <= 1;

end if;

if (str_koreksi = '1' or str_koreksi2 = '1') then

sig_pros <= '1';

elsif sig_pros = '1' then

cnt4rdaddr<=cnt4rdaddr+1;

if (cnt4rdaddr >= 255 ) then

Dec_codword_out <= "00000000";

if (cnt4rdaddr > 255 ) then

cnt4rdaddr <= 1;

sig_pros <= '0';

ram_kor <= (others=>"UUUUUUUU"); << problem2

end if;

end if;

if (cnt4rdaddr <= 255 ) then

if cnt4rdaddr = lokasi_err1 then

Dec_codword_out <= ram_kor(cnt4rdaddr) xor nilai_err1;

elsif cnt4rdaddr = lokasi_err2 then

Dec_codword_out <= ram_kor(cnt4rdaddr) xor nilai_err2;

elsif cnt4rdaddr = lokasi_err3 then

Dec_codword_out <= ram_kor(cnt4rdaddr) xor nilai_err3;

elsif cnt4rdaddr = lokasi_err4 then

Dec_codword_out <= ram_kor(cnt4rdaddr) xor nilai_err4;

elsif cnt4rdaddr = lokasi_err5 then

Dec_codword_out <= ram_kor(cnt4rdaddr) xor nilai_err5;

elsif cnt4rdaddr = lokasi_err6 then

Dec_codword_out <= ram_kor(cnt4rdaddr) xor nilai_err6;

else

Dec_codword_out <= ram_kor(cnt4rdaddr);

end if;

end if;

end if;

end if;

end process;

koreksi_done <= '1' when (last_state2 = '1' and sig_pros = '0') else '0';

data_valid_out <= "00000000" when (cnt4rdaddr > 244 ) else Dec_codword_out;

===============================================================================

the problem occurs when I add a reset, when reset I remove the program works well, but source which used to be much ....

I asked how to use the ram so that I could get the data properly .....

does anyone have a solution?

thanks 4 answer....