Dual port RAM with enable on each port( vhdl )

 1 -- Dual port RAM with enable on each port
 2 -- Xilinx rams_14
 3 
 4 library ieee;
 5 use ieee.std_logic_1164.all;
 6 use ieee.std_logic_unsigned.all;
 7 
 8 entity dp_ram is
 9   port(clk   : in  std_logic;
10     ena   : in  std_logic;
11     enb   : in  std_logic;
12     wea   : in  std_logic;
13     addra : in  std_logic_vector(10 downto 0);
14     addrb : in  std_logic_vector(10 downto 0);
15     dia   : in  std_logic_vector(7 downto 0);
16     doa   : out std_logic_vector(7 downto 0);
17     dob   : out std_logic_vector(7 downto 0)
18   );
19 end dp_ram;
20 
21 architecture rtl of dp_ram is
22   type   ram_type is array(2047 downto 0) of std_logic_vector(7 downto 0);
23   signal RAM        : ram_type;
24   signal read_addra : std_logic_vector(10 downto 0);
25   signal read_addrb : std_logic_vector(10 downto 0);
26 begin
27 
28   process(clk)
29   begin
30     if rising_edge(clk) then
31       if ena = '1' then
32         if wea = '1' then
33           RAM(conv_integer(addra)) <= dia;
34         end if;
35         read_addra <= addra;
36       end if;
37       if enb = '1' then
38         read_addrb <= addrb;
39       end if;
40     end if;
41   end process;
42 
43   doa <= RAM(conv_integer(read_addra));
44   dob <= RAM(conv_integer(read_addrb));
45 
46 end rtl;