信号发生器要求：

 

 信号发生器程序：

library ieee;
use ieee.std_logic_1164.all;
entity signal_gen1 is
port(
clk:in bit;
wave:out bit
);
end signal_gen1;
architecture bhv of signal_gen1 is
begin
process
variable count: integer range 0 to 7;
begin
wait until clk'event and clk='1';
case count is
when 0 => wave <='0';
when 1 => wave <='1';
when 2 => wave <='0';
when 3 => wave <='1';
when 4 => wave <='1';
when 5 => wave <='1';
when 6 => wave <='0';
when 7 => wave <='0';
end case;
count := count+1;
end process;
end bhv;

RTL原图：

 

 

仿真图：