LPM(参数化)库介绍

LPMQuickReferenceGuideDecember1996®AlteraCorporationiiiAboutthisQuickReferenceGuideDecember1996TheLPMQuickReferenceGuideprovidesinformationonfunctionsinthelibraryofparameterizedmodules(LPM)andoncustomparameterizedfunctionscreatedbyAltera®.HowtoContactAlteraForadditionalinformationaboutAlteraproducts,consultthesourcesshowninTable1.Note:(1)YoucanalsocontactyourlocalAlterasalesofficeorsalesrepresentative.See“AlteraSalesOffices”inthisquickreferenceguide.Table1.HowtoContactAlteraInformationTypeAccessUSA&CanadaAllOtherLocationsLiteratureAlteraExpress(800)5-ALTERA(408)894-7850AlteraLiteratureServices(888)3-ALTERA,Note(1)(888)3-ALTERA;[e-mail],Note(1)Non-technicalcustomerserviceTelephonehotline(800)SOS-EPLD(408)894-7000Fax[phone](408)954-8186TechnicalsupportTelephonehotline(8:00a.m.to5p.m.PacificTime)(800)800-EPLD(408)894-7000,Note(1)Fax[phone](408)954-0348,Note(1)Bulletinboardservice(408)954-0104(408)[e-mail]@altera.comFTPsiteftp.altera.comftp.altera.comCompuServegoalteragoalteraGeneralproductinformationTelephone(408)894-7104(408)894-7104,Note(1)World-wideweb:LPMQuickReferenceGuide“SubheadingTitle”SubheadingswithinaquickreferenceguidesectionandtitlesofMAX+PLUSIIHelptopicsareshowninquotationmarks.Example:“AlteraSalesOffices”CourierfontFunctionnamesandportnamesareshowninlowercaseCourier.Forexample:lpm_and,data[]ParameternamesareshowninuppercaseCourier.Forexample:LPM_WIDTH,LPM_DIRECTION®AlteraCorporationvContentsDecember1996AboutthisQuickReferenceGuide...............................................................................................................iiiHowtoContactAltera..........................................................................................................................iiiTypographicConventions....................................................................................................................ivSection1:Introduction...............................................................................................................................1Overview..................................................................................................................................................1HistoryofLPM........................................................................................................................................1LPMFeatures...........................................................................................................................................2LPMFunctions........................................................................................................................................2Section2:GateFunctions..........................................................................................................................3lpm_and...................................................................................................................................................4lpm_bustri............................................................................................................................................5lpm_clshift.........................................................................................................................................6lpm_constant.......................................................................................................................................7lpm_decode............................................................................................................................................8lpm_inv...................................................................................................................................................9lpm_mux.................................................................................................................................................10busmux...................................................................................................................................................11mux..........................................................................................................................................................12lpm_or...................................................................................................................................................13lpm_xor.................................................................................................................................................14Section3:ArithmeticFunctions............................................................................................................15lpm_abs...........................................