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1、-DDS波形发生器 (Synplify pro 编译通过-输出频率 Fout = Fclk*2M/2N-分辨率 Fclk/2N-最大输出频率 Fout = Fclk*50%(理论值,抽样定理-版本1.0 2004/9/29 by JJJ entity DDS is generic(ACCWidth : Integer := 16; -相位累加器的长度2N (2ACCWidth port ( CLK: in st
2、d_logic; -系统时钟 FClk STEP: in std_logic_vector(ACCWidth-1 downto 0; -步进,即相位累加器的累加增量,控制输出频率 2M 频率控制字 CHOICE: in std_logic_vector(1 downto 0; -波形选择信号 "00":正弦; "01":三角波;
3、 "10":方波; "11":不输出(恒为低电平- DAOUT : out std_logic_vector(7 downto 0; -8位DA输出模拟信号,直通方式,如需时钟控制则要修改 DAOUTX: out std_logic_vector(7 downto 0; DAOUTY: out std_logic_vector(7 downto 0 end;architecture DDS of DDS issignal ACC:std_logic_vector(ACC
4、Width-1 downto 0:=(others =>'0'signal DAOUT:std_logic_vector(7 downto 0;begin process(CLK,STEP begin if(CLK'event and CLK='1' then ACC<=ACC+STEP; end if; end process; process(CHOICE,ACC begin &
5、#160;case CHOICE is when "00"=> -正弦 case ACC(ACCWidth-1 downto ACCWidth-8 is when "00000000" => DAOUT <=
6、"10000000" when "00000001" => DAOUT <= "10000011"
7、; when "00000010" => DAOUT <= "10000110" when "00000011" => DAOUT <= "10001001" &
8、#160; when "00000100" => DAOUT <= "10001101" when "00000101" => DAOUT <= "
9、;10010000" when "00000110" => DAOUT <= "10010011"
10、0; when "00000111" => DAOUT <= "10010110" when "00001000" => DAOUT <= "10011001"
11、 when "00001001" => DAOUT <= "10011100" when "00001010" => DAOUT <= "1001
12、1111" when "00001011" => DAOUT <= "10100010"
13、60; when "00001100" => DAOUT <= "10100101" when "00001101" => DAOUT <= "10101000"
14、; when "00001110" => DAOUT <= "10101011" when "00001111" => DAOUT <= "10101110&
15、quot; when "00010000" => DAOUT <= "10110001" w
16、hen "00010001" => DAOUT <= "10110100" when "00010010" => DAOUT <= "10110111"
17、0; when "00010011" => DAOUT <= "10111010" when "00010100" => DAOUT <= "10111100"
18、 when "00010101" => DAOUT <= "10111111" when &
19、quot;00010110" => DAOUT <= "11000010" when "00010111" => DAOUT <= "11000100"
20、60; when "00011000" => DAOUT <= "11000111" when "00011001" => DAOUT <= "11001010"
21、; when "00011010" => DAOUT <= "11001100" when "
22、00011011" => DAOUT <= "11001111" when "00011100" => DAOUT <= "11010001" &#
23、160; when "00011101" => DAOUT <= "11010100" when "00011110" => DAOUT <= "11010110"
24、0; when "00011111" => DAOUT <= "11011000" when "00100
25、000" => DAOUT <= "11011011" when "00100001" => DAOUT <= "11011101" &
26、#160; when "00100010" => DAOUT <= "11011111" when "00100011" => DAOUT <= "11100001"
27、60; when "00100100" => DAOUT <= "11100011" when "00100101&q
28、uot; => DAOUT <= "11100101" when "00100110" => DAOUT <= "11100111"
29、 when "00100111" => DAOUT <= "11101001" when "00101000" => DAOUT <= "11101010" &#
30、160; when "00101001" => DAOUT <= "11101100" when "00101010"
31、=> DAOUT <= "11101110" when "00101011" => DAOUT <= "11101111"
32、; when "00101100" => DAOUT <= "11110001" when "00101101" => DAOUT <= "11110010" &
33、#160; when "00101110" => DAOUT <= "11110100" when "00101111" =>
34、 DAOUT <= "11110101" when "00110000" => DAOUT <= "11110110"
35、0; when "00110001" => DAOUT <= "11110111" when "00110010" => DAOUT <= "11111001"
36、 when "00110011" => DAOUT <= "11111010" when "00110100" => DAOU
37、T <= "11111010" when "00110101" => DAOUT <= "11111011"
38、60; when "00110110" => DAOUT <= "11111100" when "00110111" => DAOUT <= "11111101"
39、; when "00111000" => DAOUT <= "11111110" when "00111001" => DAOUT <
40、;= "11111110" when "00111010" => DAOUT <= "11111111" &#
41、160; when "00111011" => DAOUT <= "11111111" when "00111100" => DAOUT <= "11111111"
42、0; when "00111101" => DAOUT <= "11111111" when "00111110" => DAOUT <= &q
43、uot;11111111" when "00111111" => DAOUT <= "11111111" &
44、#160; when "01000000" => DAOUT <= "11111111" when "01000001" => DAOUT <= "11111111"
45、60; when "01000010" => DAOUT <= "11111111" when "01000011" => DAOUT <= "1
46、1111111" when "01000100" => DAOUT <= "11111111"
47、 when "01000101" => DAOUT <= "11111111" when "01000110" => DAOUT <= "11111111" &#
48、160; when "01000111" => DAOUT <= "11111110" when "01001000" => DAOUT <= "111111
49、10" when "01001001" => DAOUT <= "11111101"
50、; when "01001010" => DAOUT <= "11111100" when "01001011" => DAOUT <= "11111011" &
51、#160; when "01001100" => DAOUT <= "11111010" when "01001101" => DAOUT <= "11111010&qu
52、ot; when "01001110" => DAOUT <= "11111001" whe
53、n "01001111" => DAOUT <= "11110111" when "01010000" => DAOUT <= "11110110"
54、 when "01010001" => DAOUT <= "11110101" when "01010010" => DAOUT <= "11110100"&#
55、160; when "01010011" => DAOUT <= "11110010" when &qu
56、ot;01010100" => DAOUT <= "11110001" when "01010101" => DAOUT <= "11101111"
57、; when "01010110" => DAOUT <= "11101110" when "01010111" => DAOUT <= "11101100" &
58、#160; when "01011000" => DAOUT <= "11101010" when "01
59、011001" => DAOUT <= "11101001" when "01011010" => DAOUT <= "11100111"
60、0; when "01011011" => DAOUT <= "11100101" when "01011100" => DAOUT <= "11100011"
61、 when "01011101" => DAOUT <= "11100001" when "0101111
62、0" => DAOUT <= "11011111" when "01011111" => DAOUT <= "11011101"
63、60; when "01100000" => DAOUT <= "11011011" when "01100001" => DAOUT <= "11011000"
64、; when "01100010" => DAOUT <= "11010110" when "01100011&quo
65、t; => DAOUT <= "11010100" when "01100100" => DAOUT <= "11010001" &#
66、160; when "01100101" => DAOUT <= "11001111" when "01100110" => DAOUT <= "11001100"
67、0; when "01100111" => DAOUT <= "11001010" when "01101000" =&
68、gt; DAOUT <= "11000111" when "01101001" => DAOUT <= "11000100" &
69、#160; when "01101010" => DAOUT <= "11000010" when "01101011" => DAOUT <= "10111111"
70、60; when "01101100" => DAOUT <= "10111100" when "01101101" => D
71、AOUT <= "10111010" when "01101110" => DAOUT <= "10110111"
72、 when "01101111" => DAOUT <= "10110100" when "01110000" => DAOUT <= "10110001" &#
73、160; when "01110001" => DAOUT <= "10101110" when "01110010" => DAOUT
74、<= "10101011" when "01110011" => DAOUT <= "10101000"
75、; when "01110100" => DAOUT <= "10100101" when "01110101" => DAOUT <= "10100010" &
76、#160; when "01110110" => DAOUT <= "10011111" when "01110111" => DAOUT <=
77、 "10011100" when "01111000" => DAOUT <= "10011001"
78、0; when "01111001" => DAOUT <= "10010110" when "01111010" => DAOUT <= "10010011"
79、 when "01111011" => DAOUT <= "10010000" when "01111100" => DAOUT <= &quo
80、t;10001101" when "01111101" => DAOUT <= "10001001"
81、60; when "01111110" => DAOUT <= "10000110" when "01111111" => DAOUT <= "10000011"
82、; when "10000000" => DAOUT <= "10000000" when "10000001" => DAOUT <= "011
83、11101" when "10000010" => DAOUT <= "01111010" &#
84、160; when "10000011" => DAOUT <= "01110111" when "10000100" => DAOUT <= "01110011"
85、0; when "10000101" => DAOUT <= "01110000" when "10000110" => DAOUT <= "01101101
86、" when "10000111" => DAOUT <= "01101010"
87、when "10001000" => DAOUT <= "01100111" when "10001001" => DAOUT <= "01100100"
88、60; when "10001010" => DAOUT <= "01100001" when "10001011" => DAOUT <= "01011110"
89、; when "10001100" => DAOUT <= "01011011" when
90、"10001101" => DAOUT <= "01011000" when "10001110" => DAOUT <= "01010101" &#
91、160; when "10001111" => DAOUT <= "01010010" when "10010000" => DAOUT <= "01001111"
92、0; when "10010001" => DAOUT <= "01001100" when "
93、;10010010" => DAOUT <= "01001001" when "10010011" => DAOUT <= "01000110" &
94、#160; when "10010100" => DAOUT <= "01000100" when "10010101" => DAOUT <= "01000001"
95、60; when "10010110" => DAOUT <= "00111110" when "1001
96、0111" => DAOUT <= "00111100" when "10011000" => DAOUT <= "00111001"
97、 when "10011001" => DAOUT <= "00110110" when "10011010" => DAOUT <= "00110100" &#
98、160; when "10011011" => DAOUT <= "00110001" when "10011100&
99、quot; => DAOUT <= "00101111" when "10011101" => DAOUT <= "00101100"
100、; when "10011110" => DAOUT <= "00101010" when "10011111" => DAOUT <= "00101000" &
101、#160; when "10100000" => DAOUT <= "00100101" when "10100001"
102、 => DAOUT <= "00100011" when "10100010" => DAOUT <= "00100001"
103、0; when "10100011" => DAOUT <= "00011111" when "10100100" => DAOUT <= "00011101"
104、 when "10100101" => DAOUT <= "00011011" when "10100110" =>
105、; DAOUT <= "00011001" when "10100111" => DAOUT <= "00010111"
106、60; when "10101000" => DAOUT <= "00010110" when "10101001" => DAOUT <= "00010100"
107、; when "10101010" => DAOUT <= "00010010" when "10101011" => DAO
108、UT <= "00010001" when "10101100" => DAOUT <= "00001111" &#
109、160; when "10101101" => DAOUT <= "00001110" when "10101110" => DAOUT <= "00001100"
110、0; when "10101111" => DAOUT <= "00001011" when "10110000" => DAOUT &l
111、t;= "00001010" when "10110001" => DAOUT <= "00001001" &
112、#160; when "10110010" => DAOUT <= "00000111" when "10110011" => DAOUT <= "00000110"
113、60; when "10110100" => DAOUT <= "00000110" when "10110101" => DAOUT <= &
114、quot;00000101" when "10110110" => DAOUT <= "00000100"
115、 when "10110111" => DAOUT <= "00000011" when "10111000" => DAOUT <= "00000010" &#
116、160; when "10111001" => DAOUT <= "00000010" when "10111010" => DAOUT <= "
117、00000001" when "10111011" => DAOUT <= "00000001"
118、; when "10111100" => DAOUT <= "00000001" when "10111101" => DAOUT <= "00000000" &
119、#160; when "10111110" => DAOUT <= "00000000" when "10111111" => DAOUT <= "00000
120、000" when "11000000" => DAOUT <= "00000000"
121、0; when "11000001" => DAOUT <= "00000000" when "11000010" => DAOUT <= "00000000"
122、 when "11000011" => DAOUT <= "00000000" when "11000100" => DAOUT <= "00000001&q
123、uot; when "11000101" => DAOUT <= "00000001" wh
124、en "11000110" => DAOUT <= "00000001" when "11000111" => DAOUT <= "00000010"
125、; when "11001000" => DAOUT <= "00000010" when "11001001" => DAOUT <= "00000011"&
126、#160; when "11001010" => DAOUT <= "00000100" when &q
127、uot;11001011" => DAOUT <= "00000101" when "11001100" => DAOUT <= "00000110"
128、0; when "11001101" => DAOUT <= "00000110" when "11001110" => DAOUT <= "00000111"
129、 when "11001111" => DAOUT <= "00001001" when "1
130、1010000" => DAOUT <= "00001010" when "11010001" => DAOUT <= "00001011"
131、60; when "11010010" => DAOUT <= "00001100" when "11010011" => DAOUT <= "00001110"
132、; when "11010100" => DAOUT <= "00001111" when "110101
133、01" => DAOUT <= "00010001" when "11010110" => DAOUT <= "00010010" &#
134、160; when "11010111" => DAOUT <= "00010100" when "11011000" => DAOUT <= "00010110"
135、0; when "11011001" => DAOUT <= "00010111" when "11011010&qu
136、ot; => DAOUT <= "00011001" when "11011011" => DAOUT <= "00011011" &
137、#160; when "11011100" => DAOUT <= "00011101" when "11011101" => DAOUT <= "00011111"
138、60; when "11011110" => DAOUT <= "00100001" when "11011111" =
139、> DAOUT <= "00100011" when "11100000" => DAOUT <= "00100101"
140、 when "11100001" => DAOUT <= "00101000" when "11100010" => DAOUT <= "00101010" &#
141、160; when "11100011" => DAOUT <= "00101100" when "11100100" =>
142、DAOUT <= "00101111" when "11100101" => DAOUT <= "00110001"
143、; when "11100110" => DAOUT <= "00110100" when "11100111" => DAOUT <= "00110110" &
144、#160; when "11101000" => DAOUT <= "00111001" when "11101001" => DAOUT
145、 <= "00111100" when "11101010" => DAOUT <= "00111110" when "11101011" => DAOUT <= "0100
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