GC Readcommands (Destop)

readcommands : process(DIHSTRB,DIDIR,DIRSTB,Cover_s,IO_READ,cmd)     --read the COMMANDS from GC
variable i : integer range 0 to 15:=0;
variable latch : std_logic:='0';
begin


    if(DIRSTB='0')then
        cmd(0)<=X"00";
        i:=0;
    elsif(DIHSTRB'Event and DIHSTRB='1')then
        if(DIDIR='0')then
            cmd(i)<=DID;
            if(i<12)then
                i:=i+1;
            end if;
        else
            i:=0;
        end if;
    end if;

    if(DIRSTB='0') then
        LBA_offset<=(others=>'0');
        latch:='0';
    elsif(cmd(0)&cmd(1)&cmd(2)&cmd(3)=X"AABBCCDD")then
        if(DIDIR='1' and latch='0') then
        LBA_offset<=cmd(8)&cmd(9)&cmd(10)&cmd(11);
        latch:='1';
        end if;
    end if;

    if(DIDIR='1') then
        if(Cover_s='0')then
        DIERRB<='1';
        else
            if(cmd(0)=X"E0")then
                DIERRB<='1';
            else
                DIERRB<='0';
            end if;
        end if;
    else
            DIERRB<='1';
    end if;


    if (DIDIR='0' and i<10) then
        DIDSTRB<='0';
    else
        DIDSTRB<=IO_READ;
    end if;


end process readcommands;