system verilog 面试.docx

system verilog 面试.docx

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systemverilog面试

Qi1）Whatiscallback?

（Qi2）Whatisfactorypattern?

（Qi3）Explainthedifferencebetweendatatypeslogicandregandwire.

（Qi4）Whatistheneedofclockingblocks?

（Qi5）WhatarethewaystoavoidraceconditionbetweentestbenchandRTLusingSystemVerilog?

（Qi6）ExplainEventregionsinSV.

（Qi7）WhatarethetypesofcoveragesavailableinSV?

（Qi8）WhatisOOPS?

（Qi9）Whatisinheritanceandpolymorphism?

（Qi10）Whatistheneedofvirtualinterfaces?

（Qi11）Explainaboutthevirtualtaskandmethods.

（Qi12）Whatistheuseoftheabstractclass?

（Qi13）Whatisthedifferencebetweenmailboxandqueue?

（Qi14）Whatdatastructureyouusedtobuildscoreboard?

（Qi15）Whataretheadvantagesoflinkedlistoverthequeue?

（Qi16）HowparallelcaseandfullcasesproblemsareavoidedinSV?

（Qi17）Whatisthedifferencebetweenpurefunctionandcordinaryfunction?

（Qi18）Whatisthedifferencebetween$randomand$urandom?

（Qi19）Whatisscoperandomization?

（Qi20）Listthepredefinedrandomizationmethods.

（Qi21）Whatisthedfferencebetweenalways_comboandalways@（*）c?

（Qi22）Whatistheuseofpackagess?

（Qi23）Whatistheuseof$cast?

（Qi24）Howtocallthetaskwhichisdefinedinparentobjectintoderivedclass?

（Qi25）Whatisthedifferencebetweenrandandrandc?

（Qi26）Whatis$root?

（Qi27）Whatis$unit?

（Qi28）Whatarebi-directionalconstraints?

（Qi29）Whatissolve...beforeconstraint?

（Qi30）Withoutusingrandomizemethodorrand,generateanarrayofuniquevalues?

（Qi31）Explainaboutpassbyrefandpassbyvalue?

（Qi32）Whatisthedifferencebetween

bit[7:

0]sig_1;

bytesig_2;

（Qi33）Whatisthedifferencebetweenprogramblockandmodule?

（Qi34）Whatisfinalblock?

（Qi35）Howtoimplementalwaysblocklogicinprogramblock?

（Qi36）Whatisthedifferencebetweenfork/joins,fork/join_nonefork/join_any?

（Qi37）Whatistheuseofmodports?

（Qi38）Writeaclockgeneratorwithoutusingalwaysblock.

（Qi39）Whatisforwardreferencingandhowtoavoidthisproblem?

（Qi40）Whatiscirculardependencyandhowtoavoidthisproblem?

（Qi41）Whatiscrosscoverage?

（Qi42）DescribethedifferencebetweenCodeCoverageandFunctionalCoverageWhichismoreimportantandWhyweneedthem

（Qi43）Howtokillaprocessinfork/join?

（Qi44）DifferencebetweenAssociativearrayandDynamicarray?

（Qi45）Differenceb/wProceduralandConcarentAssertions?

（Qi46）WhataretheadvantagesofSystemVerilogDPI?

（Qi47）howtorandomizedynamicarraysofobjects?

（Qi48）Whatisrandsequenceandwhatisitsuse?

（Qi49）Whatisbin?

（Qi50）

Initial

wait_order（a,b,c）;

Whichfrombelowinitialprocesswillcausethatabovewaitorderwillpass.

a）

iginitialbegin

#1;

->a;

->b;

->c;

end

b）

initialbegin

#1;

->a;

end

always@a->b;

always@b->c;

c）

initialbegin

#1;

->a;

#0->b;

->>c;

end

d）

initialbegin

#1->a;

#1->b;

#1->c;

end

（Qi51）Whyalwaysblockisnotallowedinprogramblock?

（Qi52）Whichisbesttousetomodeltransaction?

Structorclass?

（Qi53）HowSVismorerandomstablethenVerilog?

（Qi54）Differencebetweenassertandexpectstatements?

（Qi55）Howtoaddanewprocessswithoutdisturbingtherandomnumbergeneratorstate?

（Qi56）WhatistheneedofaliasinSV?

（Qi57）Whatwouldbetheoutputofthefollowingcodeandhowtoavoidit?

for（inti=0;i

fork

intj=i;

begin

#10$display（"valueis0",j）;

end

join_none

end

alwaysN,ByusingautomaticKeyword,Thisproblemcanbeavoided.

fori（inti=0;i

fork

automaticintj=i;

begin

#10$display（"valueis0",j）;

end

join_none

end

（Qi58）Isitpossibleforfunctionstoreturnaarray（memory）?

（Qi59）Howtocheckweatherrandomizationisssuccessfulornot?

（Qi60）Doweneedtocallsuper.new（）whenextendingaclass?

Whathappensifwedon'tcall?

（Qi61）Equivalentconstructto|->1?

Ans:

=>

（Qi62）Whatistheneedtoimplementexplicitlyacopy（）methodinsideatransaction,whenwecansimpleassignoneobjecttoother?

（Qi63）HowdifferentistheimplementationofastructcanunioninSV.

（Qi64）Whatis"this"?

（Qi65）Whatistaggedunion?

（Qi66）Whatis"scoperesolutionoperator"?

（Qi67）WhatisthedifferencebetweenVerilogParameterizedMacrosandSystemVerilogParameterizedMacros?

（Qi68）Whatisthedifferencebetween

logicdata_1;

varlogicdata_2;

wirelogicdata_3j;

bitdata_4;

varbitdata_5;

（Qi69）Whatisthedifferencebetweenbitsandlogic?

（Qi70）WriteaStatemechineinSVstyles.

（Qi71）Whatisthedifferencebetween$roseandposedgec?

（Qi72）Whatisadvantageofprogramblockoverclockcblockw.r.tracecondition?

（Qi73）Howtoavoidtheraceconditionbetweenprogramblock?

（Qi74）Whatisthedifferencebetweenassumesandassert?

（Qi75）Whatiscoveragedrivenverification?

（Qi76）Whatislayeredarchitecture?

（Qi77）Whatarethesimulationphasesinyourverificationenvironment?

（Qi78）Howtopickaelementwhichisinqueuefromrandomindex?

（Qi79）Whatdatastructureisusedtostoredatainyourenvironmentandwhy?

（Qi80）Whatiscasting?

ExplainaboutthevarioustypesofcastingavailableinSV.

（Qi81）Howtoimportualltheitemsdeclaredinsideapackage?

（Qi82）ExplainhowthetimescaleunitandprecisionaretakenwhenamoduledoesnothaveanytimescalerdeclarationinRTL?

（Qi83）Whatisstreamingoperatorandwhatisitsuse?

（Qi84）Whatarevoidfunctions?

（Qi85）Howtomakesurethatafunctionargumentpassedhasrefisnotchangedbythefunction?

（Qi86）Whatistheuseof"extern"?

（Qi87）Whatisthedifferencebetweeninitialblockandfinalblock?

Ans:

Youcan'tscheduleaneventorhavedelaysinfinalblock.

（Qi88）Howtocheckweatherahandlesisholdingobjectornot?

（Qi89）Howtodisablemultiplethreadswhicharespawnedbyfork...join