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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use ieee.math_real.all;
entity test is
generic(
ROW_BITS : integer := 8;
WIDTH : integer := 16
);
port(
clk : in std_logic;
rd_addr : in std_logic_vector(ROW_BITS - 1 downto 0);
rd_data : out std_logic_vector(WIDTH - 1 downto 0);
wr_en : in std_logic;
wr_sel : in std_logic_vector(WIDTH/8 - 1 downto 0);
wr_addr : in std_logic_vector(ROW_BITS - 1 downto 0);
wr_data : in std_logic_vector(WIDTH - 1 downto 0)
);
end test;
architecture rtl of test is
constant SIZE : integer := 2**ROW_BITS;
type ram_type is array (0 to SIZE - 1) of std_logic_vector(WIDTH - 1 downto 0);
signal ram : ram_type;
begin
process(clk)
variable lbit : integer range 0 to WIDTH - 1;
variable mbit : integer range 0 to WIDTH - 1;
variable widx : integer range 0 to SIZE - 1;
begin
if rising_edge(clk) then
if wr_en = '1' then
for i in 0 to WIDTH/8-1 loop
lbit := i * 8;
mbit := lbit + 7;
widx := to_integer(unsigned(wr_addr));
if wr_sel(i) = '1' then
ram(widx)(mbit downto lbit) <= wr_data(mbit downto lbit);
end if;
end loop;
end if;
rd_data <= ram(to_integer(unsigned(rd_addr)));
end if;
end process;
end;
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