硬件描述语言实验附录姓名：xxx学号：xxx指导教师：xxx目录硬件描述语言实验附录 (1)实验1.三输入与门电路实验 (2)实验2. 三—八译码器实验 (3)实验3. D触发器实验 (4)实验4. 分频器实验 (5)实验5. 状态机实验 (8)实验1.三输入与门电路实验--三输入与门电路threeinput--姓名：王定--学号：1306034248--中北大学LIBRARY IEEE; --调用库USE IEEE.STD_LOGIC_1164.ALL;--库文件--------------------------------------------------------------ENTITY threeinput IS --定义实体名，其名称必须与VHDL文本文件名称相同PORT( A: IN STD_LOGIC; --输入端口，时钟输入B: IN STD_LOGIC; --输入端口，个位写入使能C: IN STD_LOGIC; --输入端口，十位写入使能CO: OUT STD_LOGIC); --输出端口，溢出标志END ENTITY threeinput; --结束端口定义--------------------------------------------------------------ARCHITECTURE RTL OF threeinput IS--定义结构体BEGINPROCESS(A,B,C) IS --开始，必须带上BEGINCO<=A AND B AND C ;END PROCESS;END ARCHITECTURE RTL; --结束结构体表1. 三输入与门电路VHDL实验代码图1. 三输入与门电路仿真波形图，A,B,C输入，CO输出实验2. 三—八译码器实验--王定--2015年11月25日--3线-8线译码器LIBRARYIEEE; --调用库USEIEEE.STD_LOGIC_1164.ALL; --库文件-------------------------------------------------------------ENTITYthreetoeightISPORT(DA TAIN:INSTD_LOGIC_VECTOR(2DOWNTO0);--数据输入DA TAOUT:OUTSTD_LOGIC_VECTOR(7DOWNTO0));--数据输出ENDENTITYthreetoeight; --结束实体-------------------------------------------------------------ARCHITECTUREBEHA VEOFthreetoeightIS--结构体BEGIN --不能漏掉PROCESS(DATAIN) --数据输入BEGIN --开始，不能漏掉CASEDATAINIS --情况判定WHEN"000"=>DA TAOUT<="00000001";WHEN"001"=>DA TAOUT<="00000010";WHEN"010"=>DA TAOUT<="00000100";WHEN"011"=>DATAOUT<="00001000";WHEN"100"=>DA TAOUT<="00010000";WHEN"101"=>DA TAOUT<="00100000";WHEN"110"=>DATAOUT<="01000000";WHEN"111"=>DA TAOUT<="10000000";WHENOTHERS=>null;ENDCASE;ENDPROCESS;ENDBEHA VE;LIBRARY IEEE;USE IEEE.STD_LOGIC_1164.ALL;ENTITY decoder_3_to_8 ISPORT (a,b,c,g1,g2a,g2b:IN STD_LOGIC;y:OUT STD_LOGIC_VECTOR(7 DOWNTO 0));END decoder_3_to_8;ARCHITECTURE rtl OF decoder_3_to_8 ISSIGNAL indata:STD_LOGIC_VECTOR (2 DOWNTO 0);BEGINindata <= c & b & a;PROCESS (indata,g1,g2a,g2b)BEGINIF (g1 = '1' AND g2a = '0' AND g2b = '0' ) THENCASE indata ISWHEN "000" => y <= "11111110";WHEN "001" => y <= "11111101";WHEN "010" => y <= "11111011";WHEN "011" => y <= "11110111";WHEN "100" => y <= "11101111";WHEN "101" => y <= "11011111";WHEN "110" => y <= "10111111";WHEN "111" => y <= "01111111";WHEN OTHERS=>y<= "XXXXXXXX";END CASE;ELSEY <= "11111111";END IF;END PROCESS;END rtl;表2. 三—八译码器VHDL实验代码图2. 三—八译码器仿真波形图--异步复位/置位的D触发器LIBRARY IEEE;USE IEEE.STD_LOGIC_1164.ALL;ENTITY dff3 ISPORT(clk,d,clr,pset:IN STD_LOGIC;q : OUT STD_LOGIC);END dff3;ARCHITECTURE rtl OF dff3 ISBEGINPROCESS (clk,pset,clr)BEGINIF (pset='0') THENq<='1';ELSIF (clr='0') THENq<='0';ELSIF (clk'EVENT AND clk='1') THENq<=d;END IF;END PROCESS ;END rtl; --同步复位的D触发器LIBRARY IEEE;USE IEEE.STD_LOGIC_1164.ALL; ENTITY dff4 ISPORT(clk,d,clr:IN STD_LOGIC;q : OUT STD_LOGIC );END dff4;ARCHITECTURE rtl OF dff4 ISBEGINPROCESS (clk)BEGINIF (clk'EVENT AND clk='1') THENIF (clr='0') THENq<='0';ELSEq<=d;END IF;END IF;END PROCESS ;END rtl;表3. 异步和同步D触发器VHDL实验代码图3. 异步触发器仿真波形图图4. 同步触发器仿真波形图--四分频器LIBRARY IEEE;USE IEEE.STD_LOGIC_1164.ALL;USE IEEE.STD_LOGIC_ARITH.ALL;USE IEEE.STD_LOGIC_UNSIGNED.ALL;----------------------------------------------ENTITY clk_div ISPORT(clk: IN STD_LOGIC;--时钟输入clk_div2: OUT STD_LOGIC;clk_div4: OUT STD_LOGIC;clk_div8: OUT STD_LOGIC;clk_div16: OUT STD_LOGIC);END ENTITY clk_div;---------------------------------------------------ARCHITECTURE rtl OF clk_div ISSIGNAL count:STD_LOGIC_VECTOR(3 DOWNTO 0);--定义一个四位的信号BEGINPROCESS(clk)BEGINIF(clk' event AND clk ='1') THEN--上升沿到来IF (count="1111") THEN--达到最大计数值count<="0000"; --置零ELSEcount<=count+1; --计数END IF;END IF;END PROCESS;clk_div2<=count(0); --2分频clk_div4<=count(1); --4分频clk_div8<=count(2); --8分频clk_div16<=count(3); --16分频END rtl;表4. 四分频器VHDL实验代码图5. 四分频器仿真波形图TMP1<= '0'; --置0,带入语句滞后ELSETMP1<= '1'; --置1END IF;END IF;END IF;END PROCESS;---------------------------------------------PROCESS(CLKIN,RST)BEGINIF RST ='1'THEN --复位有效COUNT2 <= "00000000"; --立即清零TMP2<= '1';ELSIF CLKIN'EVENT AND CLKIN='0' THEN --下降沿到来IF COUNT2 = "00000100" THEN --100==4（5个数据）COUNT2 <= "00000000";ELSECOUNT2 <= COUNT2 + 1;IF COUNT2 < "00000010" THEN --10==2（三个下降沿），小于三个上升沿时，始终置0，三个下降沿对应6分频TMP2<= '1';ELSETMP2<= '0';END IF;END IF;END IF;END PROCESS;END RTL;--信号是等待整个进程结束完后，再赋值图6. 五分频器仿真波形图实验5. 状态机实验ST <= S3; END IF; OP <= '1'; WHEN S3=> IF X = '0' THEN ST <= S3; ELSE ST <= S0; END IF; OP <= '0'; END CASE; END IF; END PROCESS STATE_COMP;END ARCHITECTURE A;END IF; END CASE; END IF;END PROCESS state_comp; END a;表6. moore 与mealy 状态机VHDL 实验代码图7. moore 型状态机VHDL 实验代码图8. mealy 型状态机仿真波形图。