sreg8b.vhd

来自「实现了VHDL乘法器」· VHDL 代码 · 共 24 行

library ieee;
use ieee.std_logic_1164.all;
entity sreg8b is port(
    clk : in std_logic;
   load : in std_logic;
    din : in std_logic_vector(7 downto 0);
     qb : out std_logic);
end sreg8b;
architecture behav of sreg8b is
   signal reg8 : std_logic_vector(7 downto 0);
begin
   process(clk)
   begin
      if rising_edge(clk) then
         if load = '1' then
            reg8 <= din;
         else
            reg8(6 downto 0) <= reg8(7 downto 1);
         end if;
      end if;
   end process;
   qb <= reg8(0);
end behav;