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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity memory_block is
port ( a : in std_logic_vector(1 downto 0);
we : in std_logic;
rd : in std_logic;
d : in std_logic_vector(1 downto 0);
q : out std_logic_vector(1 downto 0));
end memory_block;
architecture beh of memory_block is
type mem_type is array (1 to 0) of std_logic_vector(1 downto 0);
signal mem : mem_type;
begin
process(a, we, rd)
begin
if rd = '1' then
q <= mem(to_integer(unsigned(a)));
end if;
if we = '1' then
mem(to_integer(unsigned(a))) <= d;
end if;
end process;
end beh;
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