四选一多路选择器.docx

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四选一多路选择器.docx

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四选一多路选择器.docx

四选一多路选择器

（1）CASE语句

LIBRARYIEEE;

USEIEEE.STD_LOGIC_1164.ALL;ENTITYmux41aIS

PORT（a,b,c,d:

INSTD_LOGIC;

S0,S1:

INSTD_LOGIC;

OUTSTD_LOGIC）;ENDENTITYmux41a;

ARCHITECTUREcase_mux41aOFmux41aISSIGNALs0s1:

STD_LOGIC_VECTOR（1DOWNTO0）;

BEGIN

s0s1<=s1&s0;

process（s0s1,a,b,c,d）

begin

cases0s1is

when"00"=>y<=a;

when"01"=>y<=b;

when"10"=>y<=c;

when"11"=>y<=d;

whenothers=>null;

endcase;

endprocess;

endarchitecturecase_mux41a;

仿真波形

（2）drawapurgesystem,confirmedbythesupervisingprincipal;（3）thepurgingoftemporarypipeinstallation,requiredsupportandreinforcement,purgeoutletsettingafixedbracket,easytocheck;（4）atthepurgingoutletcordon,bythepersonresponsibleforsupervision;（5）setupaspecialpanelofsteampipeblowingwillbeattendedbyaunifiedcommand,assigningtheirtasks;（6）steamblowingthestepsareasfollows:

a.openthetrap,ventanddrainvalve;B.shouldwarm-upbeforepurging;C.checktheexpansionjoints,thermaldisplacementofthespringhangerandpipe;D.usedtopurgethevaportemperatureshouldnotexceedthetubingoperatingtemperature;E.purgesteamshouldbeheated?

cool?

reheatingintheorder;F.purgelinesshouldbeablowoutafterblowingthenext;G.purgepurgingofthetargetofexportplacepolishingthequalityofchecks,norust,debrisonthetargetsforqualifying.（7）thewashing,sweeping,thequalified（confirmedbytheCommissionerandowners）afterthepipeline,shouldrecover,recoveryprocedureswiththedismantlingstepsinstead,andblanksareremoved,shouldbeputontheofficialgasket,oncetherecoveryiscomplete,confirmedbythesupervisionofsite,filloutthepurge,rinserecords.2.staticequipmentinstallationprogramme2.1installationprogramsetupforstaticequipmentforstaticequipment,seebelow.2.2theconstructionpreparation2.2.1allpersonnelshouldbefamiliarwithequipmentinstallationandtechnicalinformation,includingequipmentmanufactureandAssemblydiagramsandcomponentdiagrams,equipmentinstallationdocumentation,specialtools,manuals,packinglistandprocessinstallations,equipmentcertification,theconstructionaaBy-pass,washdownstreampartsofthepipeline.（5）takeexitoftheflushinglinewithglassesofwater,checkwhetherthewatercolorand

（2）IF_THEN语句

LIBRARYIEEE;

USEIEEE.STD_LOGIC_1164.ALL;

ENTITYif_mux41aIS

PORT（a,b,c,d,s0,s1:

INSTD_LOGIC;

OUTSTD_LOGIC）;ENDENTITYif_mux41a;

ARCHITECTUREoneOFif_mux41aISSIGNALs0s1:

STD_LOGIC_VECTOR（1DOWNTO0）;BEGIN

s0s1<=S1&S0;

PROCESS（S0S1,a,b,c,d）

BEGIN

IFS0S1="00"THENy<=a;

ELSIFS0S1="01"THENy<=b;

ELSIFS0S1="10"THENy<=c;

ELSEy<=d;

ENDIF;

ENDPROCESS;

ENDARCHITECTUREone;

仿真波形

cool?

（3）WHEN_ELSE语句

LIBRARYIEEE;

USEIEEE.STD_LOGIC_1164.ALL;ENTITYmux41aIS

PORT（

a,b,c,d:

INSTD_LOGIC;

S0,S1:

INSTD_LOGIC;

OUTSTD_LOGIC

）;

ENDENTITYmux41a;

ARCHITECTUREoneOFmux41aISBEGIN

y<=awhen（s0='0'）and（s1='0'）else

bwhen（s0='1'）and（s1='0'）else

cwhen（s0='0'）and（s1='1'）else

endarchitectureone;

仿真波形

randwashdownstreampartsofthepipeline.（5）takeexitoftheflushinglinewithglassesofwater,checkwhetherthewatercolopass,-ocumentation,specialtools,manuals,packinglistandprocessinstallations,equipmentcertification,theconstructionaaBytechnicalinformation,includingequipmentmanufactureandAssemblydiagramsandcomponentdiagrams,equipmentinstallationdonandtaticequipment,seebelow.2.2theconstructionpreparation2.2.1allpersonnelshouldbefamiliarwithequipmentinstallatids.2.staticequipmentinstallationprogramme2.1installationprogramsetupforstaticequipmentforsrecorbeputontheofficialgasket,oncetherecoveryiscomplete,confirmedbythesupervisionofsite,filloutthepurge,rinse）afterthepipeline,shouldrecover,recoveryprocedureswiththedismantlingstepsinstead,andblanksareremoved,shouldwnersnorust,debrisonthetargetsforqualifying.（7）thewashing,sweeping,thequalified（confirmedbytheCommissionerandoshouldbeablowoutafterblowingthenext;G.purgepurgingofthetargetofexportplacepolishingthequalityofchecks,linesshouldnotexceedthetubingoperatingtemperature;E.purgesteamshouldbeheated?

cool?

reheatingintheorder;F.purgeg;C.checktheexpansionjoints,thermaldisplacementofthespringhangerandpipe;D.usedtopurgethevaportemperatureupbeforepurgin-gtheirtasks;（6）steamblowingthestepsareasfollows:

a.openthetrap,ventanddrainvalve;B.shouldwarmresponsibleforsupervision;（5）setupaspecialpanelofsteampipeblowingwillbeattendedbyaunifiedcommand,assigninportandreinforcement,purgeoutletsettingafixedbracket,easytocheck;（4）atthepurgingoutletcordon,bytheperson

（2）drawapurgesystem,confirmedbythesupervisingprincipal;（3）thepurgingoftemporarypipeinstallation,requiredsup3

（1）半减器

LIBRARYIEEE;

USEIEEE.STD_LOGIC_1164.ALL;

ENTITYh_suberIS

PORT（X,Y:

INSTD_LOGIC;

diff,s_out:

OUTSTD_LOGIC）;ENDENTITYh_suber;

ARCHITECTUREfh1OFh_suberisBEGIN

diff<=xXORy;s_out<=（NOTx）ANDy;ENDARCHITECTUREfh1;

仿真波形

（2）一位全减器

LIBRARYIEEE;

USEIEEE.STD_LOGIC_1164.ALL;

ENTITYf_suberIS

port（

xin,yin,sub_in:

instd_logic;

diff_out,sub_out:

outstd_logic

）;

endentityf_suber;

cool?

architecturefs1off_suberiscomponenth_suber

port（

x,y:

instd_logic;

diff,s_out:

outstd_logic

）;

endcomponent;

signala,b,c:

std_logic;

begin

u1:

h_suberportmap（x=>xin,y=>yin,diff=>a,s_out=>b）;

u2:

h_suberportmap（x=>a,y=>sub_in,diff=>diff_out,s_out=>c）;

sub_out<=corb;

endarchitecturefs1;

仿真波形

randwashdownstreampartsofthepipeline.（5）takeexitoftheflushinglinewithglassesofwater,checkwhetherthewatercolopass,-beputontheofficialgasket,oncetherecoveryiscomplete,confirmedbythesupervisionofsite,filloutth

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