I-Logic & Flip Flops-SN74LVC74APWR

Flip-FlopfuthiLatchziyizisetshenziswa zikagesi zedijithali ezivamile ezinezimo ezimbili ezizinzile ezingasetshenziswa ukugcina ulwazi, futhi i-flip-flop eyodwa noma i-latch ingagcina ibhithi elilodwa lolwazi.

I-Flip-Flop (Efushanisiwe ngokuthi FF), eyaziwa nangokuthi isango elibhistable, elaziwa nangokuthi i-bistable flip-flop, iyisekethe ye-digital logic engasebenza ezifundeni ezimbili.Ama-Flip-flop ahlala esesimweni sawo kuze kube yilapho ethola i-pulse, eyaziwa nangokuthi i-trigger.Uma i-pulse yokufaka yamukelwe, okukhiphayo kwe-flip-flop kushintsha isimo ngokwemithetho bese kuhlala kuleso simo kuze kutholwe esinye i-trigger.

I-Latch, ezwela izinga lokushaya kwenhliziyo, ishintsha isimo ngaphansi kwezinga lokushaya kwewashi, i-latch iyiyunithi yokugcina eqaliswe ileveli, futhi isenzo sokugcinwa kwedatha sincike enanini leleveli yesiginali yokufaka, kuphela lapho i-latch ingaphakathi vumela isimo, okukhiphayo kuzoshintsha ngokokufaka kwedatha.I-latch ihlukile kune-flip-flop, ayixhumi idatha, isignali ekuphumeni iyashintsha ngesignali yokufaka, njengesignali edlula ku-buffer;uma isignali ye-latch isebenza njenge-latch, idatha ikhiyiwe futhi isignali yokufaka ayisebenzi.I-latch ibizwa nangokuthi i-latch esobala, okusho ukuthi okukhiphayo kuphumela obala kokokufakayo uma kungaxhunywanga.

Umehluko phakathi kwe-latch ne-flip-flop
I-Latch kanye ne-flip-flop amadivayisi okugcina kanambambili anomsebenzi wenkumbulo, okungenye yemishini eyisisekelo yokuqamba amasekhethi anengqondo esikhathi.Umehluko uwukuthi: i-latch ihlobene nazo zonke izimpawu zayo zokufaka, lapho isignali yokufaka ishintsha izinguquko ze-latch, asikho ukuphela kwewashi;i-flip-flop ilawulwa iwashi, kuphela uma iwashi licushwa ukuze lisampula okokufaka kwamanje, likhiqize okukhiphayo.Yebo, ngenxa yokuthi kokubili i-latch ne-flip-flop kuwumqondo wesikhathi, okukhiphayo akuhlobene kuphela nokokufaka kwamanje, kodwa futhi kuhlobene nokukhiphayo kwangaphambilini.

1. I-latch iqalwa ileveli, hhayi ukulawula okuhambisanayo.I-DFF iqalwa unqenqema lwewashi nokulawula okuvumelanayo.

2, i-latch izwela ezingeni lokokufaka futhi ithintwa ukubambezeleka kwezintambo, ngakho-ke kunzima ukuqinisekisa ukuthi okukhiphayo akukhiqizi ama-burrs;I-DFF mancane amathuba okuthi ikhiqize ama-burrs.

3, Uma usebenzisa amasekhethi esango ukwakha i-latch kanye ne-DFF, i-latch idla izinsiza zesango elincane kune-DFF, okuyindawo ephakeme yokubeka i-latch kune-DFF.Ngakho-ke, ukuhlanganiswa kokusebenzisa i-latch ku-ASIC kuphakeme kune-DFF, kodwa okuphambene kuyiqiniso ku-FPGA, ngoba ayikho iyunithi ye-latch evamile ku-FPGA, kodwa kuneyunithi ye-DFF, futhi i-LATCH idinga ngaphezu kwe-LE eyodwa ukuze ibonakale.i-latch iyileveli ecushiwe, okulingana nokuba nesiphetho esivumelayo, futhi ngemva kokwenza kusebenze (ngesikhathi sokunika amandla ileveli) ilingana nocingo, olushintsha ngokuthi Okukhiphayo kuyahlukahluka ngokukhiphayo.Esimeni esingavunyelwe ukugcina isignali yasekuqaleni, engabonwa kanye nomehluko we-flip-flop, empeleni, izikhathi eziningi i-latch ayithathi indawo ye-ff.

4, i-latch izoba yinkimbinkimbi kakhulu yokuhlaziya isikhathi esimile.

5, okwamanje, i-latch isetshenziswa kuphela kumjikelezo osezingeni eliphezulu kakhulu, njenge-intel's P4 CPU.I-FPGA ineyunithi ye-latch, iyunithi yerejista ingamiswa njengeyunithi ye-latch, kumanuwali we-xilinx v2p izolungiswa njengeyunithi yerejista/letch, okunamathiselwe kungumdwebo wesakhiwo se-xilinx uhhafu wesakhiwo.Amanye amamodeli nabakhiqizi bama-FPGA abayanga ukuyobheka.--Ngokwami, ngicabanga ukuthi i-xilinx iyakwazi ukufanisa ngokuqondile i-altera ingase ibe yinkinga enkulu, ku-LE embalwa ukuyenza, noma kunjalo, hhayi idivayisi ye-xilinx ucezu ngalunye lungacushwa, isikhombimsebenzisi se-altera kuphela se-DDR sineyunithi ekhethekile ye-latch, ngokuvamile kuphela. Isifunda esinesivinini esikhulu sizosetshenziswa ekwakhiweni kwe-latch.I-altera's LE ayisona isakhiwo se-latch, futhi uhlole i-sp3 ne-sp2e, nokunye ukungahloli, imanuwali ithi lokhu kulungiselelwa kuyasekelwa.Inkulumo ethi wangdian mayelana ne-altera ilungile, i-altera's ff ayikwazi ukulungiselelwa ukuthi ixhumeke, isebenzisa ithebula lokubheka ukuze isebenzise i-latch.

Umthetho wokuklama ojwayelekile uthi: gwema i-latch emiklamo eminingi.izokuvumela ukuthi uklame isikhathi sesiphelile, futhi sifihlwe kakhulu, ongeyena umakadebona akakwazi ukukuthola.i-latch ingozi enkulu kakhulu ukuthi ungahlungi ama-burrs.Lokhu kuyingozi kakhulu ezingeni elilandelayo lesekhethi.Ngakho-ke, inqobo nje uma ungasebenzisa indawo ye-D flip-flop, ungasebenzisi i-latch.