Ingqiqo kunye neFlip Flops-SN74LVC74APWR

IiflopsikwayeLatchzizixhobo zombane eziqhelekileyo zedijithali ezinamaphondo amabini azinzileyo anokuthi b asetyenziswe ukugcina ulwazi, kunye ne-flip-flop okanye i-latch enye inokugcina i-1 bit yolwazi.

I-Flip-Flop (efinyeziweyo njenge-FF), eyaziwa ngokuba yi-bistable gate, eyaziwa ngokuba yi-bistable flip-flop, yisekethe ye-digital logic enokuthi isebenze kumazwe amabini.Ii-Flip-flops zihlala kwimeko yazo de zifumane i-pulse yegalelo, eyaziwa ngokuba yi-trigger.Xa i-pulse i-input ifunyenwe, i-flip-flop output itshintsha isimo ngokwemigaqo kwaye ihlale kweso simo de kufumaneke esinye i-trigger.

I-Latch, enovakalelo kwinqanaba le-pulse, itshintsha imeko phantsi kwenqanaba le-clock pulse, i-latch yiyunithi yokugcina eqhutywe kwinqanaba, kwaye isenzo sokugcinwa kwedatha sixhomekeke kwixabiso lezinga lomqondiso wegalelo, kuphela xa i-latch ikwi-latch. yenza imeko, imveliso iyakutshintsha ngongeniso lwedatha.I-Latch yahlukile kwi-flip-flop, ayiyiyo i-latching data, i-signal kwi-output itshintsha ngesignali yegalelo, njengomqondiso odlula kwi-buffer;emva kokuba isignali ye-latch isebenza njenge-latch, idatha ivaliwe kwaye isignali yokufaka ayisebenzi.I-latch ikwabizwa ngokuba yi-latch ecacileyo, oku kuthetha ukuba imveliso ibonakala ngokucacileyo kwigalelo xa ingabanjwanga.

Umahluko phakathi kwelatshi kunye ne-flip-flop
I-Latch kunye ne-flip-flop zizixhobo zokugcina ezibini ezinomsebenzi wememori, ezizezinye zezixhobo ezisisiseko zokuqulunqa iisekethe zengqiqo zexesha.Umahluko ngulo: i-latch inxulumene nazo zonke izibonakaliso zegalelo layo, xa isignali yegalelo itshintsha utshintsho lwe-latch, akukho terminal yewotshi;I-flip-flop ilawulwa yiwotshi, kuphela xa iwotshi iqaliswa ukuba isampula igalelo langoku, ivelise imveliso.Ewe kunjalo, ngenxa yokuba zombini i-latch kunye ne-flip-flop ziyingqiqo yexesha, imveliso ayihambelani kuphela negalelo langoku, kodwa inxulumene nemveliso yangaphambili.

1. i-latch ibangelwa kwinqanaba, kungekhona ulawulo oluhambelanayo.I-DFF iqalwa ngongqameko lwewotshi kunye nolawulo oluhambelanayo.

I-2, i-latch inovakalelo kwinqanaba lokufaka kwaye ichatshazelwa kukulibaziseka kocingo, ngoko ke kunzima ukuqinisekisa ukuba imveliso ayivelisi i-burrs;I-DFF inqabile ukuba ivelise iibhula.

I-3, Ukuba usebenzisa iisekethe zesango ukwakha i-latch kunye ne-DFF, i-latch isebenzisa izixhobo zesango ezincinci kune-DFF, eyona ndawo iphezulu ye-latch kune-DFF.Ngoko ke, ukuhlanganiswa kokusebenzisa i-latch kwi-ASIC iphezulu kune-DFF, kodwa okuchaseneyo kuyinyani kwi-FPGA, kuba akukho yunithi ye-latch eqhelekileyo kwi-FPGA, kodwa kukho iyunithi ye-DFF, kwaye i-LATCH idinga ngaphezu kwe-LE enye ukuba iqondwe.i-latch yinqanaba elibangelwe, elilingana nokuba nesiphelo sokuvumela, kwaye emva kokusebenza (ngexesha lokunika amandla inqanaba) lilingana nocingo, olutshintshayo Imveliso iyahluka kunye nemveliso.Kwimeko engenziwanga kukugcina umqondiso wokuqala, onokubonwa kunye nokwahlukana kwe-flip-flop, ngokwenene, amaxesha amaninzi i-latch ayithathi indawo ye-ff.

4, i-latch iya kuba nzima kakhulu uhlalutyo lwexesha olungatshintshiyo.

5, okwangoku, i-latch isetyenziswa kuphela kwisekethe ephezulu kakhulu, njenge-Intel's P4 CPU.I-FPGA ineyunithi ye-latch, iyunithi yokubhalisa ingaqwalaselwa njengeyunithi ye-latch, kwi-xilinx v2p manual iya kuqwalaselwa njengerejista / iyunithi ye-latch, i-attachment yi-xilinx isiqingatha sesakhiwo sedayagram.Ezinye iimodeli kunye nabavelisi be-FPGAs khange baye kukhangela.--Ngokwam, ndicinga ukuba i-xilinx iyakwazi ukungqamanisa ngokuthe ngqo i-altera inokuba yingxaki ngakumbi, kwi-LE embalwa ukuyenza, nangona kunjalo, hayi isixhobo se-xilinx isilayi ngasinye sinokuqwalaselwe, ujongano lwe-altera kuphela lweDDR luneyunithi ekhethekileyo yelatch, ngokubanzi kuphela. Isiphaluka esinesantya esiphezulu siya kusetyenziswa kuyilo lwelatshi.I-altera ye-LE ayilolwakhiwo lwe-latch, kwaye khangela i-sp3 kunye ne-sp2e, kunye nokunye ukungajongi, incwadana ithi olu qwalaselo luyaxhaswa.Ibinzana elithi wangdian malunga nealtera lilungile, ialtera's ff ayinakucwangciswa ukuba ibe nelatshi, isebenzisa itafile yokujonga ukuphumeza ilatshi.

Umgaqo woyilo jikelele ngulo: thintela i-latch kuyilo oluninzi.iya kukuvumela ukuba uyile ixesha ligqityiwe, kwaye lifihlwe kakhulu, ongelogqala alinakuyifumana.latch eyona ngozi inkulu kukungahluzi i-burrs.Oku kuyingozi kakhulu kwinqanaba elilandelayo lesekethe.Ngoko ke, ukuba ungasebenzisa indawo ye-D flip-flop, musa ukusebenzisa i-latch.