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CSM51Ach7 - Chap ter Spec icat iono fsequen t ia l sy stem...

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Unformatted text preview: Chap ter Spec icat iono fsequen t ia l sy stem s Them a intop icso fth ischap terare Theden it iono fsynch ronou ssequen t ia lsy stem s . Thestatedescr ip t ionandt im ebehav ioro fsequen t ia lsy stem s . M ea lyandM oorem ach ines . F in ite-m em orysy stem s . Thedescr ip t iono fcon tro llersassequen t ia lsy stem s . Equ iva len tsy stem sandm in im izat iono fthenum bero fstates . Exam p leso fspec icat iono fsequent ia lsy stem s . Spec icat iono fsequent ia lsy stem sin vhdl . W eadd ressnow thespec icat iono fsequent ia lsy stem s .A sw ea lreadyknow , aspec icat iondescr ibesthefunct iono fasy stem inawaythatisadequatefor u s ingthesy stem asacom ponen tina largersy stem ,and forim p lem en t ingthe sy stem asanetw orko fs im p lerm odu les . A sdescr ibed inChap ter,thespec icat iono facom b inat iona lsy stem con- s istso ftheinpu tandou tpu tsets(bothn ite) ,andtheinpu t-ou tpu tfunct ion ; thefunct ioncanbedenedind ierentw ay s ,suchasatab le ,anexp ress ion (ar ithm et ic ,cond it iona lorlog ica l) ,oracom pos it iono fs im p lerfunct ion s .Se- quen t ia lsy stem s ,ontheotherhand ,u setw od ierenttypeso fdescr ip t ion s :the statedescr ip t ion , wh ichcon s istso ftw o funct ion sonn itesets ,andthe t im e behav ior , wh ichcorrespond stoafunct ionont im esequences .Inth ischap ter w ed iscu ssandre latethesetw otypeso fdescr ip t ion s . C hap ter.Spec ica tiono fsequen tia lsystem s x(t) z(t) t x z time F igu re.: Inpu tandou tpu tt im efunct ions . Thesequen t ia lsy stem sspec iedinth ischap terhaveas ign icant lym ore com p lexbehav iorthanthecom b inat iona lsy stem sspec ied inChap ter.H ow- ever ,theyst illarere lat ive lys im p lecom paredtothecom p lex ityo f,forexam p le , ad ig ita lp rocessor .Thespec icat iontechn iquesp resen tedherearesu itab leto descr iberathers im p lesy stem s ,wh ichareu sedascom ponen tsinm orecom p lex ones .Thosecom p lexsy stem srequ irethereg ister-tran sferleve lspec icat ion app roachp resen ted in laterchap terso fth isbook . . Synch ronou ssequen t ia lsy stem s A sequen t ia lsy stem isad ig ita lsy stem inwh ichtheou tpu tatanyg ivent im e depend snoton lyontheinpu tatthatt im ebu ta lsoonp rev iou sinpu ts .That is ,theou tpu tatt im e t ,denotedby z ( t ) ,depend sontheinpu tt im e-funct ion inthein terva l( ;t )(seeF igu re.) .Th iscanbeexp ressedas z ( t )= F ( x ( ;t )) where in x ( t )be longstotheinpu tset I and z ( t )totheou tpu tset O ,w ithboth setsn ite .Thespec icat iono fthesy stem bythefunct ion F isca lled its t im e behav ior . .. Synch ronou sandasynch ronou ssy stem s A ccord ingtothet im ein stan tsatwh ichtheinpu tsandou tpu tsarecon s id- ered ,sequen t ia lsy stem sarec lass iedin to synch ronou s and asynch ronou s sy stem s ,asfo llow s : .. Synchronoussequen tia lsystem s time Clock CLK x(t) z(t) 1 2 3 4 5 6 (a) x(t) z(t) time (b) F igu re.: a)Synch ronousbehav io r.b)A synch ronousbehav io r. Synch ronou ssy stem . Inpu tsandou tpu tsarecon s ideredatd...
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