x  y
1  14
2  45
3  67
4  32
5  12
6  64
7  89
8  34
9  54
10 22

case address is
    when 1 =>      result <= 14;
    when 2 =>      result <= 45;
    when 3 =>      result <= 67;
    when 4 =>      result <= 32;
    when 5 =>      result <= 12;
    when 6 =>      result <= 64;
    ...
    when others => result <= 0;  -- Default
end case;

Memory_Initialization_Radix=16;
Memory_Initialization_Vector=
0E,2D,43,20,0C,40,59,22,36,16;

entity cgrom is
 port (clkin : in std_logic;
      adr : in std_logic_vector(13 downto 0);
     data:out std_logic_vector(3 downto 0));
     end cgrom;

 architecture a_cgrom of cgrom is

 attribute INIT_00 :string;attribute INIT_01 :string;attribute INIT_02 :string;attribute INIT_03 :string;
attribute INIT_04 :string;attribute INIT_05 :string;attribute INIT_06 :string;attribute INIT_07 :string;

attribute INIT_00 of chargen0: label is "0000000000000000000000000000000000000000000000000000000000000000";
attribute INIT_01 of chargen0: label is "00000000000000E000E00060000000200040006000E000E000E000E000E00000";
attribute INIT_02 of chargen0: label is "00000000000000000000000000000000000000000000011C011C011C011C0000";
attribute INIT_03 of chargen0: label is "0000000000000048007C005C00CC01D800B800B801B007FC0330017007700260";
attribute INIT_04 of chargen0: label is "00000020002000DC03FC01080120035000F0005C0028030C01FC035800200000";
attribute INIT_05 of chargen0: label is "00000000000001800600006002C0039C0384038C0398006A0076003600300000";
attribute INIT_06 of chargen0: label is "00000000002002F803BA059E03CC03E60654007800700030001C00F800F80020";
attribute INIT_07 of chargen0: label is "0000000000000000000000000000000000000000000000600060006000600000";

subtype nybble is std_logic_vector(3 downto 0);
subtype byte is std_logic_vector(7 downto 0);

signal romClock   : std_logic;
signal romAddress : nybble;
signal romResult  : byte;

myROM: process(romClock,romAddress) is
begin
    if (rising_edge(romClock)) then
        case romAddress is
            when x"1"   => romResult <= x"0E"; -- 14
            when x"2"   => romResult <= x"2D"; -- 45
            when x"3"   => romResult <= x"43"; -- 67
            when x"4"   => romResult <= x"20"; -- 32
            when x"5"   => romResult <= x"0C"; -- 12
            when x"6"   => romResult <= x"40"; -- 64
            when others => romResult <= x"00"; -- 0
        end case;
    end if;
end process myROM;