8x8-bit multiply

Hello all

I want to multiply two signed 8-bit numbers and pick 8 bits from the result.

My code is like this:

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity test is

Port ( k : in std_logic_vector(7 downto 0);

x : in std_logic_vector(7 downto 0);

y : out std_logic_vector(7 downto 0));

end test;

architecture beh of test is

signal kx : std_logic_vector(15 downto 0);

constant Offset : integer := 4;

begin

kx