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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity ram01 is
port (raddr : std_logic_vector (3 downto 0);
rdat : out std_logic_vector (7 downto 0);
waddr : std_logic_vector (3 downto 0);
wdat : std_logic_vector (7 downto 0);
wen : std_logic;
clk : std_logic);
end ram01;
architecture behav of ram01 is
type memdat is record
d1 : std_logic_vector(7 downto 0);
end record;
type memtype is array(0 to 15) of memdat;
begin
process (clk)
variable mem : memtype;
begin
if rising_edge (clk) then
if wen = '1' then
mem (to_integer(unsigned (waddr))).d1 := wdat;
end if;
-- The read port is synchronous
rdat <= mem (to_integer(unsigned (raddr))).d1;
end if;
end process;
end behav;
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