quartusii怎么实现半波正弦信号?急急急急！

Question

用quartusii软件要实现半波正弦信号，bdf的图该怎么画？

Answer 1

可用megafunction中的nco模块实现完整的正弦波信号，在dsp->signal generation中。然后再用比较器滤除其中小于0 的部分，就得到了半波正弦信号。

Answer 2

LIBRARY IEEE;--jian xiang zheng xing
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;

ENTITY jian_xiang_zheng_xing is
port(zheng_xian:in std_logic_vector(9 downto 0);
zheng_xian_half:out std_logic_vector(9 downto 0));
end jian_xiang_zheng_xing;

architecture bhv of jian_xiang_zheng_xing is
signal sin:std_logic_vector(9 downto 0);
begin
process(zheng_xian)
begin
sin<=zheng_xian;
if sin>=512 then
zheng_xian_half<=sin;
else
zheng_xian_half<=1024-sin;
end if;
end process;
end bhv;