[ERROR]"Can't resolve multiple constant drivers for net ......."

[Altera_Forum]

Hello, 

 It's my first time wriring in VHDL language ,so do not be offended by the potential mistakes I could have made.  My problem is as following ,I created process describing one of the states.This process i responsible for initializng two blank tables.  The process is as following:   process(start_sygnal, clk) begin if clk'event and clk = '1' then if start_sygnal = '1' then gra_Tablica(0) <= ( x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000"); gra_Tablica(1) <= ( x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000", x"00000000000000000000000000000000"); wykonano_start_sygnal <= '1'; else wykonano_start_sygnal <= '0'; end if; end if; end process;  Unfortunatley i got constatnt error form compiler f.i :  "Error (10028): Can't resolve multiple constant drivers for net "gra_Tablica[1][63][125]" at a.vhd(541)"  How do solve this matter  Thansk in advance

[Altera_Forum]

I guess, the conflict is from concurrent assignment in another process, that isn't shown in the posting, also the array definition is unknown. If you have concurrent assignments to registers, they have to reside in one process to allow the compiler to resolve the access. 

 B.T.W., I wonder which Quartus version your are using, mine has no capital letter ERROR messages.  The initialisation could be achieved more comfortable (and better readable) by  gra_Tablica(0) <= (OTHERS =>(OTHERS => '0')); --or probably gra_Tablica <= (OTHERS =>(OTHERS =>(OTHERS => '0')));