标签: apextm

   InAPEXTMIIdevices,enhancedembeddedsystemblocks(ESBs)supportmemorystructures,suchassingle-portanddual-portRAM.Additionally,inAPEXIIdevices,ESBssupportbidirectionaldual-portRAM.Inthismode,eachESBhastwoportsthatallowtwodifferentreadorwriteoperationssimultaneously.InAPEXII、devices,theESBcanbesplitintotwoseparatesingle-port2KRAMblocks.……

   APEXTMIIdeviceshaveClockLockTM,ClockBoostTM,andClockShiftTMfeaturesthatusegeneral-purposephase-lockedloops(PLLs)toincreaseperformanceandprovideclock-frequencysynthesis.TheClockLockfeatureminimizesclockdelayandclockskewwithinthedevice,reducingclock-to-outputandsetuptimeswhilemaintainingzeroholdtimes.APEXIIdevicesalsoincludeadvancedClockBoostcircuitryforfractionalorintegermultiplication.DesignerscanuseClockBoostcircuitrytoruntheinternallogicofthedeviceatafasterorslowerratethantheinputclockfrequency.TheClockShiftcircuitryallowscomplexclockphase-anddelay-shiftingapplications.APEXIIgeneral-purposePLLsalsogenerateexternalclockoutputswithfeedbackability.Theseenhancedfeaturespermitsystem-levelclockmanagementandskewcontrolinAPEXIIdevices.……