CSM51Ach3 - Chap ter C om b inat iona lin tegrated c ircu...

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Unformatted text preview: Chap ter C om b inat iona lin tegrated c ircu its :character ist ics andcapab ilit ies Inth ischap ter ,w ed iscu ss Therep resen tat iono fb inaryvar iab lesatthephy s ica lleve l. Thebas icsw itchstructu reo fgatesandthe iroperat ion . Therea lizat iono fgatesu s ing cmo s c ircu its . Thecharacter ist icso fc ircu its :load factorsand fanou tfactors ,p ropaga- t ionde lay s ,tran s it iont im es ,andeecto fload . Th ree-stategates(d r ivers)andbu ses . Theeecto fno iseandno isem arg in s . Theevo lu t iono fIC s . VLS Ic ircu it-leve ldes ignsty les . P ackag ing leve ls :ch ip s ,board sandcab inets . The vhdl descr ip t iono fgates . Therea lizat iono fcom b inat iona ld ig ita lsy stem sinvo lvestw o leve ls : a)The log icleve l, atwh ichthep r im it ivecom ponen tsareca lled gates . Thesegatesim p lem en tbas icsw itch ingfunct ion s ,suchas and , or , not , xor , nand ,and nor . cmo s {C om p lem en taryM eta lO x ideSem iconductorc ircu ittechno logy . C hap ter.C om b ina tiona lIC s:charac ter isticsandcapab ilities b )The c ircu itleve l, wh ichcorrespond stothephy s ica lrea lizat iono fthe gates . C om b inat iona lsy stem sspec iedbysetso fsw itch ing funct ion s(asd iscu ssed inChap ter)areim p lem en tedas netw ork s o fgates .Th is/ funct iona l" im- p lem en tat ion isindependen to fthec ircu itleve l.H ow ever ,therearesom echar- acter ist icso ftherea lizat iono fthegatesthatdeterm inewhetherag ivengate netw ork{wh ich isfunct iona llycorrect{canbephy s ica llyrea lizedornot .M ore- over ,these lect iono fthem ostsu itab legatenetw ork interm so fm easu ressuchas speed ,costandpackag ings izedepend sonc ircu itcharacter ist ics .C on sequen t ly , theim portan tissuesatthephy s ica lrea lizat ion leve lcannotbeignored . D ig ita lsy stem scou ldberea lizedbydes ign ingd irect lyatthec ircu itleve l. H ow ever ,thatop t ion istoocom p lexandt im e-con sum ing forlargesy stem sbe- cau setherearetoom any in teract ing factors .Ah ierarch ica lapp roach isam ore adequatestrategy ,inwh ichthec ircu itcharacter ist icso fs im p lem odu lesare ab stractedandthenu sed inthedes ignatthelog icleve l.Theapp roachu sed in th isbook fo llow stheh ierarch ica lstrategy ju stm en t ioned .F orthosepu rposes , inth ischap terw ep rov ideane lem en taryd iscu ss iono fthec ircu itsu sedtorea lize com b inat iona lgatesas in tegra tedc ircu its (IC s) .Laterchap tersu sethesegates tocon structd ig ita lnetw ork s .W econ s idergatesatthee lectr ica l-c ircu itleve l, w ithou tgo ing in todeta ilso ftheassoc iatede lectron icsandso lid-statephy s ics . Theob ject iveo fth ischap teristhedescr ip t iono fthebas iccharacter ist icsand param etersatthec ircu itleve l,wh ichareneededtodeterm inethefeas ib ilityo f ag ivensy stem asw e llastose lectasu itab ledes ignatthelog icleve l. Thec ircu itsp resen tedherearein tendedto illu stratetheconcep ts ,structu re andbehav iorthataretyp ica l;theydonotnecessar ilycorrespond ina lldeta ilsto actua lc ircu...
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