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1、EDA实验（五）一、1、例8・11的VHDL语言：LIBRARYIEEE;USE1EEE.STD_LOGIC_1164.ALL;ENTITYSCHKISPORT(DIN,CLK,CLR:INSTD.LOGIC;AB:OUTSTD_LOGIC_VECTOR(3DOWNTO0));ENDSCHK;ARCHITECTUREBEHAVOFSCHKISSIGNALQ:INTEGERRANGE0TO8;SIGNALD:STD_LOGIC_VECTOR(7DOWNTO0);BEGIND<=,,inooior,；PROCES
2、S(CLK,CLR)BEGINIFCLR二TTHENQ<=0;ELSIFCLK'EVENTANDCLK='1*THENCASEQISWHEN0=>IFDIN=D(7)THENQ<=1;ELSEQ<=0;ENDIF;WHEN1=>IFDIN二D(6)THENQ<=2;ELSEQ<=0;ENDIF;WHEN2=>IFDIN=D(5)THENQ<=3;ELSEQ<=0;ENDIF;WHEN3=>IFDIN=D(4)THENQ<=4;ELSEQ<=0;ENDIF;WHEN4=>IFDIN=D(3)THENQ<=5;E
3、LSEQ<=0;ENDIF;WHEN5=>IFDIN=D(2)THENQ<=6;ELSEQ<=0;ENDIF;WHEN6=>IFDIN=D(1)THENQ<=7;ELSEQ<=0;ENDIF;WHEN7=>IFDIN=D(0)THENQ<=8;ELSEQ<=0;ENDIF;WHENOTHERS=>Q<=0;ENDCASE;ENDIF;ENDPROCESS;PROCESS(Q)BEGINIFQ二8THENABv二T010”；ELSEABv二T011”；ENDIF;ENDPROCESS;ENDBEHAV;2、例8
4、・11的功能仿真波形：CLKCLRDINABnnnnnnnnnnnn:-1011XioioX1011由功能仿真波形可以看出：随着时钟信号elk连续8个上升沿的到來如果输入信号满足11100101,则输出1010,其他情况则全部输出1011,起到密码锁的作用。3、例8・11的时序仿真波形:1、moore型状态机的VHDL语言：libraryieee;useieee.std_logic_l164.all;useieee.std_logic_unsigned.all;useieee.std_logic_arith.
5、all;entitymachineisport(din,clk,clr:instdjogic;ab:outstcl」ogic_vector(3downto0));endmachine;architectureoneofmachineistypefsinis(s0,sl,s2,s3,s4,s5,s6,s7,s8);signalcurrent_state,next_state:fsin;beginreg:process(clk^clr)beginifclr=Tthencurrent_state<=sO;elsif
6、clk'eventandelk-Tthencurrentstate<=nextstate;endif;endprocessreg;com:process(current_state)begincasecurrent_stateiswhens0=>ifdin-I1thennext_state<=s1;elsenext_state<=sO;endif;abv二T011”；whensl=>ifdin-Tthennext_state<=s2;elsenext_state<=sO;ab<=H1011H;endif;wh
7、ens2=>ifdin=trthennext_state<=s3;elsenext_state<=sO;endif;ab<=H10HH;whens3=>ifdin=tO,thennext_state<=s4;elsenext_state<=sO;endif;abv二T011”；whens4=>ifdin=,O,thennext_state<=s5;elsenext_state<=sO;endif;abv二TO11”;whens5=>ifdin=rrthennext_state<=s6;elsenext_sta
8、te<=sO;endif;ab<=H10HH;whens6=>ifdin=,O,thennext_state<=s7;elsenext_state<=sO;endif;abv二TO11”；whens7=>ifdin-Tthennext_state<=s8;elsenext_state<=sO;endif;ab<=H10HH;whens8=>ab<=H101OH;next_state<=sO;when
