CSM51Ach11

CSM51Ach11 - Chap ter S tandardsequen t ia l m odu les Inth...

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Unformatted text preview: Chap ter S tandardsequen t ia l m odu les Inth ischap ter ,w ep resen t A seto fw ide lyu sedstandardsequen t ia lm odu les . Thespec icat iono fthesestandardm odu les . A n im p lem en tat ionw ith ip- op sandgatesforeacho fthesestandard m odu les . Them a inu seso fthesestandardm odu les . Theim p lem en tat iono flargem odu lesasnetw ork so fsm a llerones . M u lt im odu lesequen t ia lsy stem s . W enow studyaseto fstandardsequen t ia lm odu les ,nam e lyreg isters ,sh ift- reg isters ,andcoun ters ;w ed iscu ssthe irspec icat ionandcharacter ist ics ,and showhow thesem odu lesarein terconnectedtoformm odu larnetw ork s .Inth is chap ter ,thesy stem sim p lem en tedasm odu larsequen t ia lnetw ork scorrespondto rathers im p leones .M orecom p lexsequen t ia lsy stem srequ ireareg ister-tran sfer leve lapp roach forthe irspec icat ion ,ana ly s is ,anddes ign ;suchanapp roach is d iscu ssed inChap ters th rough. . R eg isters A n n-b it reg ister isaco llect iono fb inaryce llsu sedtostoreab it-vector .Th is standardm odu leisanex ten s iono fthestatereg isteru sed inthecanon ica l im p lem en tat iono fsequen t ia lnetw ork s ,ob ta inedbyadd ing con tro linpu ts LD ( load )and CLR ( clear ) ,asdep icted inF igu re..Thedata inpu tanddata C hap ter.S tandardsequen tia lm odu les CLK CLR (Clear) LD (Load) n n Data input x Data output z REGISTER Control inputs F igu re.: n-b itreg isterm odu le . ou tpu tarethe n-b itvectors x and z ,respect ive ly .Theou tpu to fthereg ister correspond sto itsstate ,and CLK isthesynch ron iz ingc lock . Adescr ip t iono fan n-b itreg isterm odu leis Inpu ts : x = ( x n ;:::;x ) ;x i f ; g LD ; CLR f ; g O u tpu ts : z = ( z n ;:::;z ) ;z i f ; g S tate : s = ( s n ;:::;s ) ;s i f ; g Funct ion : Thestatetran s it ionandou tpu tfunct ion sare s ( t +)= < : x ( t ) if LD ( t )= and CLR ( t )= s ( t ) if LD ( t )= and CLR ( t )= ( ::: ) if CLR ( t )= z ( t )= s ( t ) Thecon tro linpu t CLR isasynch ronou s ;thatis ,itseectontheou tpu t takesp laceimm ed iate lyratherthanwhenthec locks igna lisrece ived .Th is con tro linpu tforcestheva lue( ::: )in tothereg ister ;itiscomm on lyu sed forin it ia lizat ionpu rposesatthebeg inn ingo ftheoperat iono fthesy stem ,to guaran teethatthereg istercon ta in sap redenedva lue .The CLR inpu tshou ld notbeu seddu r ingthesynch ronou soperat ion . A n im p lem en tat iono fareg isteru s ing D ip- op sandm u lt ip lexersisg iven inF igu re..N otethat ,whenthereisnochangeinstate ,thecu rren tstate (ou tpu t)o fthereg isterisu sedasinpu t .Ad iagram descr ib ingthet im e-behav ior o fareg isterisshown inF igu re.. .. R eg isters z 3 x 3 z 2 x 2 z 1 x 1 z x CLR CLK LD D Q Q’ D Q Q’ D Q Q’ D Q Q’ 1 MUX 1 MUX 1 MUX 1 MUX F igu re.: Im p lem en ta t iono fa-b itreg ister....
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This note was uploaded on 03/26/2010 for the course CS 187154200 taught by Professor Ercegovac,m.d. during the Winter '09 term at UCLA.

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CSM51Ach11 - Chap ter S tandardsequen t ia l m odu les Inth...

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