10110101序列信號發生器.vhd library IEEE; use IEEE.std_logic_1164.all; use ieee.std_logic_unsigned.all; entity count8 is port ( r: in std_logic; clk: in STD_LOGIC; cout: out std_logic ); end count8; architecture count8_arch of count8 is signal dd: std_logic_vector ( 2 downto 0 ); begin count: process ( r,clk ) begin if ( r='1' ) then dd<="000"; elsif( clk'event and clk = '1') then dd <= dd + '1'; end if ; end process count ; with dd select cout<='1'when"000", '0'when"001", '1'when"010", '1'when"011", '0'when"100", '1'when"101", '0'when"110", '1'when"111", '0'when others ;
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