講義說明案例ftcle

Toggle/LoadableFlip-FlopwithToggleandClockEnableandAsynchronousClearSpartan-II,Spartan-CoolRunner DT

Q

FTCLEisatoggle/loadableflip-flopwithtoggleandclockenableandasynchronousclear.Whentheasynchronousclearinput(CLR)isHigh,allotherinputsareignoredandoutputQisresetLow.Whenloadenableinput(L)isHighandCLRisLow,clockenable(CE)isoverriddenandthedataondatainput(D)isloadedintotheflip-flopduringtheLow-to-Highclock(C)transition.Whentoggleenable(T)andCEareHighandLandCLRareLow,outputQtoggles,orchangesstate,duringtheLow-to-Highclocktransition.WhenCEisLow,clocktransitionsareignored.Theflip-flopisasynchronouslycleared,outputLow,whenpowerisForXC9500/XV/XL,CoolRunnerX 3,andCoolRunner-II,thepower-onconditioncanbesimulatedbyapplyingaHigh-levelpulseonthePRLDglobalnet.Spartan-II,Spartan-IIE,Spartan-3,Virtex,Virtex-E,Virtex-II,Virtex-IIPro,andVirtex-IIProXsimulatepower-onwhenglobalset/reset(GSR)isactive.GSRdefaultstoactive-HighbutcanbeinvertedbyaddinganinverterinfrontoftheLTDCQ1XXXXX001XX1101XX00000XXXNo0010XXNo0011XLibraries ISET

OMD

C

FTCLEImplementationSpartan-II,Spartan-IIE,Virtex,Virtex-TC

FTCLEImplementationSpartan-3,Virtex-II,Virtex-IIPro,Virtex-IIPro LTDQQDCCQ ForHDL,thisdesignelementisinferredratherthan LibrariesISEFTCLEFTCLE具有切換和時(shí)鐘使能功能的切換/可加載觸發(fā)器以及支持的異步架構(gòu)FTCLESpartan-II、Spartan-IIESpartan-3Virtex、Virtex-EVirtex-II、Virtex-IIPro、Virtex-IIProXMacroXC9500、XC9500XV、XC9500XLPrimitiveCoolRunnerX3PrimitiveCoolRunner-IIPrimitiveFTCLE是一款切換/可加載觸發(fā)器，具有切換和時(shí)鐘使能以及異步FTCLED功能。當(dāng)異步輸入(CLR)為時(shí)，所有其他輸入均被忽略為低電平，輸出Q復(fù)位為低電平。當(dāng)加載使能輸入(L)為高且CLR為低時(shí)，時(shí)鐘TQ使能(CE)被覆蓋，數(shù)據(jù)輸入(D)上的數(shù)據(jù)在低到高時(shí)鐘(C)期間加載到觸發(fā)器CE中過渡。當(dāng)切換使能(T)和CE為且L和CLR為低電平時(shí)，輸出Q在低到高時(shí)鐘轉(zhuǎn)換期間切換或更改狀態(tài)。當(dāng)CE為低電CLR當(dāng)通電時(shí)，觸發(fā)器被異步，輸出低電平對(duì)于XC9500/XV/XL、CoolRunnerX3和CoolRunner-II，可以通過在PRLD全局網(wǎng)絡(luò)上應(yīng)用高Spartan-II、Spartan-IIE、Spartan-3、Virtex、Virtex-E、Virtex-II、Virtex-IIProVirtex-IIProX在全局設(shè)置/復(fù)位(GSR)GSR默認(rèn)為有效，但可以通過在STARTUP_SPARTAN2、STARTUP_SPARTAN3、STARTUP_VIRTEX2GSR輸入輸出CLRLCETDCQ1.XXXXX01XX1↑01XX0↑000XXX0010XX0011X↑切換庫(kù)指南 ISE8.1iFTCLEFTCLE實(shí)現(xiàn)Spartan-II、Spartan-IIE、Virtex、Virtex-EQX9323FTCLE實(shí)施Sp