我问一个VHDL的问题大家过来看一下谢了

发表于 2007-8-24 17:46

我想实现这样一个逻辑功能  用4位2进制信号cin来控制一个输出信号  当0000时输出一个10进制数字并且这个数字是最小数字  当1111输出一个10进制数字  这个数字是最大数字  当cin在0000和1111之间时输出从最小数到最大中间的任意一个从小到大的数 具体的大家看我的程序  大家有没什么问题  谢谢了 library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; use ieee.std_logic_arith.all; entity yindiao is port (clk  : in  std_logic;  cin :  in std_logic_vector(3 downto 0);  q    : out integer range 0 to 10204 ); end yindiao; architecture behave of yindiao is begin   process(clk)   variable cnt1:integer range 0 to 150000;   begin      if clk'event and clk='1' then        if cnt1&lt150000 then         --此数值控制每一个音的长短           cnt1:=cnt1+1;        else           cnt1:=0;           case cin is             when "0000"   =&gtq&lt=638;                                when "0001"  =&gtq&lt=1275;                                    when "0010"   =&gtq&lt=1913;                                    when "0011"   =&gtq&lt=2550;                                    when "0100"   =&gtq&lt=3186;             when "0101"  =&gtq&lt=3823;                                    when "0110"   =&gtq&lt=4460;                                   when "0111"   =&gtq&lt=5098;                                    when "1000"   =&gtq&lt=5700;                                     when "1001"  =&gtq&lt=6300;                                     when "1010"  =&gtq&lt=6900;                                   when "1011"  =&gtq&lt=7600;                                   when "1100"  =&gtq&lt=8200;                                   when "1101"  =&gtq&lt=8890;                                when "1110"  =&gtq&lt=9500;                                    when "1111"  =&gtq&lt=10204;           end case;        end if;     end if;   end process; end behave;

发表于 2007-8-25 09:33

std_logic类型有九种值，你没有列出000z等类型，可以在case后面加上others或者用if语句来编程，我忘了case的语法，所以就改成if语句的了。 library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; use ieee.std_logic_arith.all; entity yindiao is port (clk  : in  std_logic; cin :  in std_logic_vector(3 downto 0); q    : out integer range 0 to 10204 ); end yindiao; architecture behave of yindiao is begin   process(clk)   variable cnt1:integer range 0 to 150000;   begin      if clk'event and clk='1' then        if cnt1&lt150000 then         --此数值控制每一个音的长短           cnt1:=cnt1+1;        else           cnt1:=0;         if              cin= "0000"   then q&lt=638;                            elsif cin= "0001" then q&lt=1275;                                 elsif   cin= "0010"  then  q&lt=1913;                                 elsif   cin= "0011"   then q&lt=2550;                                 elsif   cin= "0100"   then q&lt=3186;          elsif   cin= "0101"  then  q&lt=3823;                                  elsif  cin= "0110"  then q&lt=4460;                               elsif    cin= "0111"  then q&lt=5098;                                 elsif   cin= "1000"  then q&lt=5700;                                 elsif    cin= "1001" then q&lt=6300;                                 elsif    cin= "1010" then q&lt=6900;                                elsif   cin= "1011" then q&lt=7600;                               elsif    cin= "1100"  then q&lt=8200;                               elsif    cin= "1101" then  q&lt=8890;                            elsif    cin= "1110" then  q&lt=9500;                                elsif    cin= "1111" then  q&lt=10204;         end if;       end if;     end if;   end process; end behave;

发表于 2007-8-25 10:40

我试了一下结果还是不行  郁闷啊

发表于 2007-8-25 12:27

我刚才用maxplus编译了一下，没问题啦！？

发表于 2007-8-27 08:26

仿真输出不管输入的是多少都是0啊  这是怎么回事？

发表于 2007-8-27 14:22

library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; use ieee.std_logic_arith.all; entity yindiao is port (clk  : in  std_logic;  reset: in  std_logic; cin :  in std_logic_vector(3 downto 0); q    : out std_logic_vector(13 downto 0) ); end yindiao; architecture behave of yindiao is signal cnt1:integer range 0 to 150000; signal q_s : integer range 0 to 10204; begin   process(clk,reset)      begin        if reset='1' then           cnt1&lt=0;       elsif rising_edge(clk) then        if cnt1&lt150000 then         --此数值控制每一个音的长短           cnt1:=cnt1+1;        else              cnt1&lt=0;           case cin is             when "0000"   =&gtq_s&lt=638;                                when "0001"  =&gtq_s&lt=1275;                                    when "0010"   =&gtq_s&lt=1913;                                    when "0011"   =&gtq_s&lt=2550;                                    when "0100"   =&gtq_s&lt=3186;             when "0101"  =&gtq_s&lt=3823;                                    when "0110"   =&gtq_s&lt=4460;                                   when "0111"   =&gtq_s&lt=5098;                                    when "1000"   =&gtq_s&lt=5700;                                     when "1001"  =&gtq_s&lt=6300;                                     when "1010"  =&gtq_s&lt=6900;                                   when "1011"  =&gtq_s&lt=7600;                                   when "1100"  =&gtq_s&lt=8200;                                   when "1101"  =&gtq_s&lt=8890;                                when "1110"  =&gtq_s&lt=9500;                                    when "1111"  =&gtq_s&lt=10204;             when others  =&gtq_s&lt=0;           end case;        end if;     end if;   end process;   q&lt=conv_std_logic_vector(q_s,14); end behave;

发表于 2007-8-27 15:28

cnt1&lt=0; cnt1是个变量怎么能代入呢  肯定不行啦

发表于 2007-8-27 15:34

cnt1:=cnt1+1; cnt1是个信号  怎么能这样赋值  肯定不行啦

发表于 2007-8-27 22:20

library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; use ieee.std_logic_arith.all; entity yindiao is     port         (clk      :     in  std_logic;          cin     :      in std_logic_vector(3 downto 0);          q        :   out integer range 0 to 10204         ); end yindiao; architecture behave of yindiao is begin     process(clk)     variable cnt1:integer range 0 to 1500 :=4;       begin          if clk'event and clk='1' then            if cnt1&lt1500 then         --此数值控制每一个音的长短              cnt1:=cnt1+1;              else               cnt1:=0;             CASE cin IS                 WHEN "0000" =&gtq&lt=638;                 WHEN "0001" =&gtq&lt=1275;                 WHEN "0010" =&gtq&lt=1913;                 WHEN "0011" =&gtq&lt=2550;                 WHEN "0100" =&gtq&lt=3186;                 WHEN "0101" =&gtq&lt=3823;                 WHEN "0110" =&gtq&lt=4460;                 WHEN "0111" =&gtq&lt=5098;                 WHEN "1000" =&gtq&lt=5700;                 WHEN "1001" =&gtq&lt=6300;                 WHEN "1010" =&gtq&lt=6900;                 WHEN "1011" =&gtq&lt=7600;                 WHEN "1100" =&gtq&lt=8200;                 WHEN "1101" =&gtq&lt=8890;                 WHEN "1110" =&gtq&lt=9500;                 WHEN "1111" =&gtq&lt=10204;                 WHEN OTHERS =&gtq&lt=0;             END CASE;              end if;         end if;     end process; end behave; 这个我仿真出来了，下载应该可以的。 变量cnt1声明时，要赋值。 另外为了仿真方便，我把变量cnt1的范围改成了0到1500

发表于 2007-8-28 09:06

这是一个控制蜂鸣器发出友谊天长地久音乐的一个乐谱 用Q来表示的  另外再接一个控制部分就可以控制蜂鸣器演奏了 时钟频率4M 其中的CNT2变量是干什么用的呢？ library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; use ieee.std_logic_arith.all; entity yindiao is port (clk  : in  std_logic;  q    : out integer range 0 to 10204 ); end yindiao; architecture behave of yindiao is begin   process(clk)   variable cnt1:integer range 0 to 1500000;   variable cnt2:integer range 0 to 8;   variable n   :integer range 0 to 45;   begin      if clk'event and clk='1' then        if cnt1&lt1500000 then         --此数值控制每一个音的长短           cnt1:=cnt1+1;        else           cnt1:=0;           case n is             when 0   =&gtq&lt=10204;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=1;                        end if;             when 1   =&gtq&lt=7364;                        if cnt2&lt6 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=2;                        end if;             when 2   =&gtq&lt=6061;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=3;                        end if;             when 3   =&gtq&lt=6803;                        if cnt2&lt3 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=4;                        end if;             when 4   =&gtq&lt=7634;                        n:=5;             when 5   =&gtq&lt=6803;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=6;                        end if;             when 6   =&gtq&lt=6061;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=7;                        end if;             when 7   =&gtq&lt=7634;                        if cnt2&lt4 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=8;                        end if;             when 8   =&gtq&lt=6061;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=9;                        end if;             when 9   =&gtq&lt=5089;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=10;                        end if;             when 10  =&gtq&lt=4535;                        if cnt2&lt9 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=11;                        end if;             when 11  =&gtq&lt=5089;                        if cnt2&lt3 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=12;                        end if;             when 12  =&gtq&lt=6061;                        if cnt2&lt2 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=13;                        end if;             when 13  =&gtq&lt=7634;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=14;                        end if;             when 14  =&gtq&lt=6803;                        if cnt2&lt3 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=15;                        end if;             when 15  =&gtq&lt=7634;                        n:=16;             when 16  =&gtq&lt=6803;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=17;                        end if;             when 17  =&gtq&lt=6061;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=18;                        end if;             when 18  =&gtq&lt=7634;                        if cnt2&lt3 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=19;                        end if;             when 19  =&gtq&lt=9050;                        if cnt2&lt2 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=20;                        end if;             when 20  =&gtq&lt=10204;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=21;                        end if;             when 21  =&gtq&lt=7634;                        if cnt2&lt7 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=22;                        end if;             when 22  =&gtq&lt=4535;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=23;                        end if;             when 23  =&gtq&lt=5089;                        if cnt2&lt3 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=24;                        end if;             when 24  =&gtq&lt=6061;                        if cnt2&lt2 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=25;                        end if;             when 25  =&gtq&lt=7634;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=26;                        end if;             when 26  =&gtq&lt=6803;                        if cnt2&lt3 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=27;                        end if;             when 27  =&gtq&lt=7634;                        n:=28;             when 28  =&gtq&lt=6803;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=29;                        end if;             when 29  =&gtq&lt=4535;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=30;                        end if;             when 30  =&gtq&lt=5089;                        if cnt2&lt3 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=31;                        end if;             when 31  =&gtq&lt=6061;                        if cnt2&lt2 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=32;                        end if;             when 32  =&gtq&lt=5089;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=33;                        end if;             when 33  =&gtq&lt=4535;                        if cnt2&lt7 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=34;                        end if;             when 34  =&gtq&lt=3809;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=35;                        end if;             when 35  =&gtq&lt=5089;                        if cnt2&lt3 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=36;                        end if;             when 36  =&gtq&lt=6061;                        if cnt2&lt2 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=37;                        end if;             when 37  =&gtq&lt=7634;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=38;                        end if;             when 38  =&gtq&lt=6803;                        if cnt2&lt3 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=39;                        end if;             when 39  =&gtq&lt=7634;                        n:=40;             when 40  =&gtq&lt=6803;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=41;                        end if;             when 41  =&gtq&lt=6061;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=42;                        end if;             when 42  =&gtq&lt=7634;                        if cnt2&lt3 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=43;                        end if;             when 43  =&gtq&lt=9050;                        if cnt2&lt2 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=44;                        end if;             when 44  =&gtq&lt=10204;                        if cnt2&lt1 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=45;                        end if;             when 45  =&gtq&lt=7634;                        if cnt2&lt7 then                           cnt2:=cnt2+1;                        else                           cnt2:=0;                           n:=0;                        end if;           end case;        end if;     end if;   end process; end behave;

发表于 2007-8-28 13:36

看来就是因为没有赋初值  我把他的程序弄进去以后确实是跟我的设计结果比较符合了

发表于 2007-9-2 13:49

每个音符可能会是一拍或两拍等等，我觉得cnt2用于控制这个。 n代表的是已经播放到了第几个音符。

我问一个VHDL的问题大家过来看一下 谢了

相关帖子

case语句要求列出所以可能

谢谢这位兄弟了

不行？

程序编译通过 但是仿真的时候没结果啊

试试

cnt1<=0;

cnt1:=cnt1+1;

variable cnt1:integer range 0 to 1500 :=4;

大家帮忙看下这个程序里的CNT2变量是干什么用的

9楼的兄弟解决了问题

cnt2应该是控制每个音节的拍数

浏览过的版块

我问一个VHDL的问题大家过来看一下谢了

程序编译通过但是仿真的时候没结果啊