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1、用VHDL语言设计交通灯控制器:要求:1.东西方向为主干道,南北方向为副干道.2.主干道通行40秒后，若副干道无车，仍主干道通行，否则转换。3.换向要有4秒黄灯期。4.南北通行时间为20秒，到时间转换，若未到时，仍南北方向。--JTDKZ.VHDLIBRARYIEEE;USEIEEE.STD_LOGIC_1164.ALL;ENTITYJTDKZISPORT(CLK,SM,SB:INSTD_LOGIC;MR,MY0,MG0,BR,BY0,BG0:OUTSTD_LOGIC);ENDENTITYJTDKZ;ARCHITECTUREARTOFJTDK
2、ZISTYPESTATE_TYPEIS(A,B,C,D);SIGNALSTATE:STATE_TYPE;BEGINCNT:PROCESS(CLK)ISVARIABLES:INTEGERRANGE0TO45;VARIABLECLR,EN:BIT;BEGINIF(CLK'EVENTANDCLK='1')THENIFCLR='0'THENS:=0;ELSEIFEN='0'THENS:=S;ELSES:=S+1;ENDIF;CASESTATEISWHENA=>MR<='0';MY0<='0';MG0<='1';BR<='1';BY0<='0';BG0
3、<='0';IF(SBANDSM)='1'THENIFS=45THENSTATE<=B;CLR:='0';EN:='0';ELSESTATE<=A;CLR:='1';EN:='1';ENDIF;ELSEIF(SBAND(NOTSM))='1'THENSTATE<=B;CLR:='0';EN:='0';ELSESTATE<=A;CLR:='1';EN:='1';ENDIF;ENDIF;WHENB=>MR<='0';MY0<='1';MG0<='0';BR<='1';BY0<='0';BG0<='0';IFS=5THENSTATE<=C;CLR:
4、='0';EN:=39'0';ELSESTATE<=B;CLR:='1';EN:='1';ENDIF;WHENC=>MR<='1';MY0<='0';MG0<='0';BR<='0';BY0<='0';BG0<='1';IF(SMANDSB)='1'THENIFS=25THENSTATE<=D;CLR:='0';EN:='0';ELSESTATE<=C;CLR:='1';EN:='1';ENDIF;ELSEIFSB='0'THENSTATE<=D;CLR:='0';EN:='0';ELSESTATE<=C;CLR:='1';EN:='1';E
5、NDIF;ENDIF;WHEND=>MR<='1';MY0<='0';MG0<='0';BR<='0';BY0<='1';BG0<='0';IFS=5THENSTATE<=A;CLR:='0';EN:='0';ELSESTATE<=D;CLR:='1';EN:='1';ENDIF;ENDCASE;ENDIF;ENDIF;ENDPROCESSCNT;ENDARCHITECTUREART;--CNT05S.VHDLIBRARYIEEE;USEIEEE.STD_LOGIC_1164.ALL;USEIEEE.STD_LOGIC_UNSIGNED.AL
6、L;ENTITYCNT05SISPORT(CLK,EN05M,EN05B:INSTD_LOGIC;DOUT5:OUTSTD_LOGIC_VECTOR(7DOWNTO0));ENDENTITYCNT05S;ARCHITECTUREARTOFCNT05SISSIGNALCNT3B:STD_LOGIC_VECTOR(2DOWNTO0);BEGINPROCESS(CLK,EN05M,EN05B)ISBEGINIF(CLK'EVENTANDCLK='1')THENIFEN05M='1'THEN39CNT3B<=CNT3B+1;ELSIFEN05B='1
7、'THENCNT3B<=CNT3B+1;ELSIFEN05B='0'THENCNT3B<=CNT3B-CNT3B-1;ENDIF;ENDIF;ENDPROCESS;PROCESS(CNT3B)ISBEGINCASECNT3BISWHEN"000"=>DOUT5<="00000101";WHEN"001"=>DOUT5<="00000100";WHEN"010"=>DOUT5<="00000011";WHEN"011"=>DOUT5<="00000010";WHEN"100"=>DOUT5<="00000001";WHENOTHERS=>DOU
8、T5<="00000000";ENDCASE;ENDPROCESS;ENDARCHITECTUREART;--CNT25S.VHDLIBRARYIEEE;USEIE
