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LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.numeric_std.ALL;
ENTITY ram IS
PORT
(
clock : IN std_logic;
data : IN std_logic_vector(15 DOWNTO 0);
write_address : IN std_logic_vector(8 DOWNTO 0);
read_address : IN std_logic_vector(8 DOWNTO 0);
we : IN std_logic;
q : OUT std_logic_vector(15 DOWNTO 0)
);
END ram;
ARCHITECTURE rtl OF ram IS
TYPE RAM IS ARRAY(0 TO 511) OF std_logic_vector(15 DOWNTO 0);
SIGNAL ram_block : RAM;
BEGIN
PROCESS (clock)
BEGIN
IF (clock'event AND clock = '1') THEN
IF (we = '0') THEN
ram_block(to_integer(unsigned(write_address))) <= data;
END IF;
q <= ram_block(to_integer(unsigned(read_address)));
END IF;
END PROCESS;
END rtl;