Logic & Flip Flops-SN74LVC74APWR

Flip-FlopthiabLatchyog cov khoom siv hluav taws xob digital uas muaj ob lub xeev ruaj khov uas tuaj yeem siv los khaws cov ntaub ntawv, thiab ib qho flip-flop lossis latch tuaj yeem khaws 1 me ntsis cov ntaub ntawv.

Flip-Flop (Abbreviated li FF), tseem hu ua lub rooj vag bistable, tseem hu ua bistable flip-flop, yog lub logic digital uas tuaj yeem ua haujlwm hauv ob lub xeev.Flip-flops nyob twj ywm hauv lawv lub xeev kom txog thaum lawv tau txais cov khoom siv mem tes, tseem hu ua qhov ua rau.Thaum tau txais ib qho input mem tes, lub flip-flop tso zis hloov lub xeev raws li txoj cai thiab ces tseem nyob rau hauv lub xeev mus txog rau thaum lwm yam trigger tau txais.

Latch, rhiab rau qib mem tes, hloov lub xeev raws li qib ntawm lub moos pulse, latch yog qib-tsim cia chav tsev, thiab qhov kev txiav txim ntawm cov ntaub ntawv khaws cia nyob ntawm qib tus nqi ntawm lub teeb liab tawm, tsuas yog thaum lub latch nyob hauv enable state, cov zis yuav hloov nrog cov ntaub ntawv input.Latch yog txawv ntawm flip-flop, nws tsis yog latching cov ntaub ntawv, lub teeb liab ntawm qhov tso zis hloov nrog lub input teeb liab, ib yam li lub teeb liab dhau los ntawm ib tug tsis;ib zaug lub teeb liab latch ua raws li lub latch, cov ntaub ntawv raug kaw thiab lub teeb liab input tsis ua haujlwm.Lub latch tseem hu ua pob tshab latch, uas txhais tau hais tias cov zis yog pob tshab rau cov tswv yim thaum nws tsis latched.

Qhov sib txawv ntawm latch thiab flip-flop
Latch thiab flip-flop yog binary cia li nrog lub cim xeeb muaj nuj nqi, uas yog ib qho ntawm cov khoom siv yooj yim los tsim ntau lub sijhawm logic circuits.Qhov txawv yog: latch muaj feem xyuam rau tag nrho nws cov input signals, thaum lub input teeb liab hloov latch hloov, tsis muaj moos davhlau ya nyob twg;flip-flop yog tswj los ntawm lub moos, tsuas yog thaum lub moos ua rau ua piv txwv cov tswv yim tam sim no, tsim cov zis.Tau kawg, vim tias ob qho tib si latch thiab flip-flop yog lub sij hawm logic, cov zis tsis yog tsuas yog cuam tshuam nrog cov tswv yim tam sim no, tab sis kuj muaj feem cuam tshuam nrog cov zis dhau los.

1. latch yog triggered los ntawm theem, tsis synchronous tswj.DFF yog tshwm sim los ntawm moos ntug thiab synchronous tswj.

2, latch yog rhiab heev rau qib nkag thiab cuam tshuam los ntawm kev xaim qeeb, yog li nws yog qhov nyuaj los xyuas kom meej tias cov zis tsis tsim burrs;DFF tsis tshua muaj peev xwm tsim cov burrs.

3, Yog hais tias koj siv lub rooj vag circuits los tsim latch thiab DFF, latch siv lub rooj vag tsawg dua li DFF, uas yog qhov chaw zoo tshaj rau latch dua DFF.Yog li, kev sib koom ua ke ntawm kev siv latch hauv ASIC yog siab dua DFF, tab sis qhov sib txawv yog qhov tseeb hauv FPGA, vim tias tsis muaj cov qauv latch hauv FPGA, tab sis muaj DFF chav tsev, thiab LATCH xav tau ntau dua ib qho LE kom paub.latch yog theem triggered, uas yog sib npaug rau muaj qhov kawg enabled, thiab tom qab ua kom tiav (thaum lub sij hawm ntawm enables theem) yog sib npaug rau ib tug hlau, uas hloov nrog cov zis sib txawv nrog cov zis.Nyob rau hauv lub xeev uas tsis yog-enabled yog tswj cov thawj teeb liab, uas yuav pom tau thiab flip-flop sib txawv, qhov tseeb, ntau zaus latch tsis yog ib tug hloov rau ff.

4, latch yuav dhau los ua kev tshawb xyuas lub sijhawm zoo li qub.

5, tam sim no, latch tsuas yog siv nyob rau hauv high-end Circuit Court, xws li Intel's P4 CPU.FPGA muaj latch unit, lub register unit yuav configured raws li ib tug latch unit, nyob rau hauv xilinx v2p phau ntawv yuav tsum configured li register/latch unit, qhov txuas yog xilinx ib nrab daim duab daim duab.Lwm cov qauv thiab cov chaw tsim khoom ntawm FPGAs tsis tau mus kuaj.--Tus kheej, kuv xav tias xilinx muaj peev xwm ua tau ncaj qha rau cov altera tej zaum yuav muaj teeb meem ntau dua, rau ob peb LE ua, txawm li cas los xij, tsis yog xilinx ntaus ntawv txhua daim tuaj yeem teeb tsa, altera tsuas yog DDR interface muaj qhov tshwj xeeb latch unit, feem ntau tsuas yog high-speed Circuit Court yuav siv rau hauv lub latch tsim.altera's LE yog tsis muaj latch qauv, thiab xyuas cov sp3 thiab sp2e, thiab lwm yam tsis mus xyuas, phau ntawv qhia hais tias qhov kev teeb tsa no tau txais kev txhawb nqa.Qhov kev qhia wangdian txog altera yog txoj cai, altera's ff tsis tuaj yeem teeb tsa rau latch, nws siv lub rooj nrhiav los siv latch.

Txoj cai tsim qauv dav dav yog: zam latch nyob rau hauv feem ntau tsim.nws yuav cia koj tsim lub sij hawm tiav, thiab nws yog heev zais, tsis-veteran nrhiav tsis tau.latch qhov txaus ntshai tshaj plaws yog tsis lim burrs.Qhov no yog qhov txaus ntshai heev rau qib tom ntej ntawm Circuit Court.Yog li ntawd, tsuav koj siv tau D flip-flop qhov chaw, tsis txhob siv latch.