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library ieee;
use ieee.std_logic_1164.all,
ieee.numeric_std.all;
entity ram4 is
generic (
ADDRWIDTH : positive := 12;
WIDTH : positive := 8
);
port (
clk_a : in std_logic;
read_a : in std_logic;
write_a : in std_logic;
addr_a : in std_logic_vector(ADDRWIDTH - 1 downto 0);
data_read_a : out std_logic_vector(WIDTH - 1 downto 0);
data_write_a : in std_logic_vector(WIDTH - 1 downto 0);
clk_b : in std_logic;
read_b : in std_logic;
write_b : in std_logic;
addr_b : in std_logic_vector(ADDRWIDTH - 1 downto 0);
data_read_b : out std_logic_vector(WIDTH - 1 downto 0);
data_write_b : in std_logic_vector(WIDTH - 1 downto 0)
);
end ram4;
architecture behavioral of ram4 is
begin
process(clk_a, clk_b)
type ram_t is array(0 to 2**ADDRWIDTH - 1) of std_logic_vector(WIDTH - 1 downto 0);
variable store : ram_t := (others => (others => '0'));
begin
if rising_edge(clk_a) then
if read_a = '1' then
data_read_a <= store(to_integer(unsigned(addr_a)));
end if;
if write_a = '1' then
store(to_integer(unsigned(addr_a))) := data_write_a;
end if;
end if;
if rising_edge(clk_b) then
if read_b = '1' then
data_read_b <= store(to_integer(unsigned(addr_b)));
end if;
if write_b = '1' then
store(to_integer(unsigned(addr_b))) := data_write_b;
end if;
end if;
end process;
end behavioral;
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