CSM51Ach4

CSM51Ach4 - Chap ter D escr ip t ionandana ly s iso f...

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Unformatted text preview: Chap ter D escr ip t ionandana ly s iso f gatenetw ork s Inth ischap ter ,w ed iscu ss Theden it ion ,descr ip t ion ,andcharacter ist icso fgatenetw ork s . A lternat ivesetso fgatesthatcom posenetw ork s . Theana ly s iso fgatenetw ork s :determ inat iono fthefunct ionando fother character ist ics . Thedescr ip t iono fgatenetw ork su s ing vhdl . A sind icated inChap ter,therea lizat iono facom b inat iona lsy stem invo lves thec ircu itleve landthelog icleve l.Thec ircu itleve l,wh ichw asthesub jecto f thep rev iou schap ter ,dea lsw iththephy s ica lrea lizat iono fgates .Incon trast , thelog icleve lcon s istso ftherea lizat iono facom b inat iona lsy stem byaco llec- t iono fs im p lersy stem s(ca lled com b inat iona lm odu les )inastructu reknown asa com b inat iona lnetw ork .Th isnetw orkconcep tcanbeu sedatsevera l leve lsinah ierarch ica lm anner(seeF igu re.)becau seam odu leinanetw ork can itse lfberea lizedasanetw orko fs im p lerm odu les .Sucharea lizat ion is re ferredtoasa h ierarch ica lim p lem en tat ion o facom b inat iona lsy stem . Inth ischap terw estudythelow estleve lo ftheh ierarch ica lim p lem en tat ion , nam e ly gatenetw ork s ,thatis ,com b inat iona lnetw ork sinwh ichthem odu les arethegatesdescr ibed inChap ters and.Thesenetw ork sareim portan t becau setheyp rov idethein terfacebetw eenthec ircu itleve landthelog icleve l, andtheyrep resen tthefoundat iononwh ichm orecom p lexsy stem saredeve l- oped .M oreover ,th isstudya llow su sto in troduceconcep tsandp rocedu resthat areu se fu lata llleve lso ftheh ierarchy .Th ischap teradd ressesthedescr ip t ion C hap ter.D escr ip tionandana lysiso fga tene tw orks Combinational module Combinational module Combinational system F igu re.: H iera rch ica lim p lem en ta t iono facom b ina t iona lsystem . z 1 z x 3 x 2 x 1 x F igu re.: Aga tenetw o rk . andana ly s iso fgatenetw ork s ,whereasdes ignm ethod sarep resen ted inthe nex tchap ter . . D en it iono fgatenetw ork s A gatenetw ork isan in terconnect iono fgatesthatim p lem en tsa(b inary ) com b inat iona lsy stem .A sshown inF igu re.,itcon s istso f gates ; ex terna linpu tsandou tpu ts ;and connect ion s( from ex terna linpu tsandgateou tpu ts to gateinpu tsand ex terna lou tpu ts) . The connect ion s inanetw orkcarry s igna ls (va lues) ,andhavethefo llow- ingrestr ict ion s : .. D en itiono fga tene tw orks G 1 G 3 G 2 illegal G 1 F =10 L =1 G G 2 G 8 (a) (b) L =1 L =1 G 1 G 3 G 2 (c) G 1 G 3 G 2 (d) F igu re.: a)Inva lidnetw o rkconnect ion .b)A ccep tab leou tpu tload .c)Loop-free netw o rk .d)Loopnetw o rk . .E achgateinpu tisconnectede ithertoacon stan tva lue(or) ,toa netw ork(ex terna l)inpu t ,ortoagateou tpu t .O n lyoneconnect iontoa gateinpu tisa llow ed ;anundenedva luem igh tresu ltiftw oorm ores ig- na ls(w ithd ierentva lues)areconnecteds im u ltaneou s lytoas ing legate inpu t .Excep t ion stoth isru learetheth ree-stateconnect ion sd iscu ssed inChap ter. F igu re.ashow san inva lidconnect...
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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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CSM51Ach4 - Chap ter D escr ip t ionandana ly s iso f...

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