EDA中用VHDL語(yǔ)言編程的實(shí)驗(yàn)

1、EDA課程中VHDL的分頻程序(1)將 32KHz分成1KHz 占空比百分之五十LIBRARY IEEE;USE IEEE.STD_LOGIC_1164.ALL;ENTITY fenpin ISPORT (CLK: IN STD_LOGIC;q: OUT STD_LOGIC);END fenpin;ARCHITECTURE arc OF fenpin ISsignal wire:std_logic;BEGIN PROCESS (clk) VARIABLE cnt: INTEGER RANGE 0 TO 31;BEGIN IF clk'EVENT AND clk='1'

2、THENIF cnt<16 THENcnt:=cnt+1;-if cnt=7 then wire<='0'end if; 可以通過這綠色字體修改占空比。ELSE cnt:=0;-q<='1'wire<=not wire;END IF; END IF;END PROCESS;q<=wire;END arc;（2）9進(jìn)制計(jì)數(shù)器程序如下LIBRARY IEEE;USE IEEE.STD_LOGIC_1164.ALL;USE IEEE.STD_LOGIC_UNSIGNED.ALL;ENTITY CNT9 ISPORT (CLK1,RST,E

3、N : IN STD_LOGIC;CQ : OUT STD_LOGIC_VECTOR (3 DOWNTO 0);END CNT9;ARCHITECTURE behave OF CNT9 ISBEGIN PROCESS (CLK1,RST,EN) VARIABLE CQI : STD_LOGIC_VECTOR (3 DOWNTO 0); BEGIN IF RST = '1' THEN CQI := (OTHERS =>'0'); ELSIF CLK1'EVENT AND CLK1='1' THEN IF EN ='1'

4、 THEN IF CQI < 8 THEN CQI := CQI +1; ELSE CQI := (OTHERS =>'0'); END IF; END IF; END IF; CQ <= CQI; END PROCESS; END behave;（3）譯碼器的程序編寫。USE IEEE.STD_LOGIC_1164.ALL;ENTITY DECL7S IS PORT (D:IN STD_LOGIC_VECTOR(3 DOWNTO 0); A:IN STD_LOGIC_VECTOR(2 DOWNTO 0); B:OUT STD_LOGIC_VECTOR(2 D

5、OWNTO 0); LED7S :OUT STD_LOGIC_VECTOR(6 DOWNTO 0);END DECL7S;ARCHITECTURE one OF DECL7S ISBEGIN B <= A; PROCESS(D)BEGINCASE D ISWHEN "0000" => LED7S <= "0111111"WHEN "0001" => LED7S <= "0000110"WHEN "0010" => LED7S <= "10110

6、11"WHEN "0011" => LED7S <= "1001111"WHEN "0100" => LED7S <= "1100110"WHEN "0101" => LED7S <= "1101101"WHEN "0110" => LED7S <= "1111101"WHEN "0111" => LED7S <= "0000111&qu

7、ot;WHEN "1000" => LED7S <= "1111111"WHEN "1001" => LED7S <= "1101111"WHEN OTHERS => NULL;END CASE;END PROCESS;END;將上述三個(gè)程序主合成一個(gè)通過將32KHz分成1KHz,在譯碼器上顯示數(shù)字0到9.的主合程序，需進(jìn)行元件例化。例化程序如下：LIBRARY IEEE;USE IEEE.STD_LOGIC_1164.ALL;ENTITY KON IS PORT(ain,bin,ci

8、n:IN STD_LOGIC; AN:IN STD_LOGIC_VECTOR(2 DOWNTO 0); BN:OUT STD_LOGIC_VECTOR(2 DOWNTO 0); YOUT:OUT STD_LOGIC_VECTOR(6 DOWNTO 0);END KON;ARCHITECTURE one OF KON IS COMPONENT fenpin PORT(CLK:IN STD_LOGIC; Q:OUT STD_LOGIC); END COMPONENT; COMPONENT CNT9 PORT(CLK1,RST,EN:IN STD_LOGIC; CQ:OUT STD_LOGIC_VE

9、CTOR(3 DOWNTO 0); END COMPONENT; COMPONENT DECL7S PORT(D:IN STD_LOGIC_VECTOR(3 DOWNTO 0); A:IN STD_LOGIC_VECTOR(2 DOWNTO 0); B:OUT STD_LOGIC_VECTOR(2 DOWNTO 0); LED7S:OUT STD_LOGIC_VECTOR(6 DOWNTO 0); END COMPONENT;SIGNAL e:STD_LOGIC;SIGNAL F:STD_LOGIC_VECTOR(3 DOWNTO 0); BEGIN u1:fenpin PORT MAP(CL

10、K=>ain,Q=>e); u2:CNT9 PORT MAP(CLK1=>e,RST=>bin, EN=>cin,CQ=>F); u3:DECL7S PORT MAP(D=>F,A=>AN,LED7S=>YOUT);END ARCHITECTURE one;具體操作過程如下： File>new>VHDL點(diǎn)擊OK即可，再將分頻程序粘貼即可，再運(yùn)行 在新建工程選中New Project wizard.如下圖所示開始新建工程如下圖所示注意工程名一定要與實(shí)體名一致，如fenpin就與實(shí)體名一致。單擊Next即可彈出如下圖再單擊Next即可。按下圖選好相應(yīng)的芯片 再單擊Next再單擊下圖Next再單擊Next第二個(gè)程序以及第三個(gè)程序都只需保存編譯即可，不許再將工