reg16b.vhd

实现了VHDL乘法器

library ieee;
use ieee.std_logic_1164.all;
entity reg16b is port(
    clk : in std_logic;
    clr : in std_logic;
      d : in std_logic_vector(8 downto 0);
      q : out std_logic_vector(15 downto 0));
end reg16b;
architecture behav of reg16b is
   signal r16s : std_logic_vector(15 downto 0);
begin
   process(clk,clr)
   begin
      if clr = '1' then
         r16s <= (others => '0');
      elsif rising_edge(clk) then
         r16s(6 downto 0) <= r16s(7 downto 1);
         r16s(15 downto 7) <= d;
      end if;
   end process;
   q <= r16s;
end behav;