Trigger yog cov cuab yeej yooj yim tshaj plaws, uas yog lub tshuab digital. Nws muaj ob lub xeev stability. Ib tug ntawm lawv yog muab tus nqi "1", thiab lwm yam - "0". Lub xeev ntawm qhov tshwm sim, nrog rau tus nqi ntawm cov ntaub ntawv binary uas khaws cia hauv nws, yog txiav txim siab los ntawm cov khoom tso tawm: ncaj qha thiab thim rov qab. Yog hais tias qhov tso zis ncaj qha muaj peev xwm ua tau raws li lub hauv paus ntsiab lus, ces lub xeev no yog hu ua ib lub xeev (qhov no, lub teeb liab theem ntawm inverted tso zis sib haum mus rau ib tug logical zero). Yog tias tsis muaj peev xwm, ces cov xwm txheej zoo li no hu ua xoom.
Trigger hom. Classification
- Asynchronous thiab synchronous triggers yog qhov txawv ntawm txoj kev sau cov ntaub ntawv. Hauv cov khoom siv asynchronous, kev hloov pauv tshwm sim thaum cov ntaub ntawv teeb liab tuaj txog ntawm cov khoom siv. Hauv synchronous, ntxiv rau cov ntaub ntawv tseem ceeb, kuj tseem muaj kev tswj hwm cov khoom siv (ib lossis ntau dua). Xws li kev hloov pauv thaum lawv tau txais cov cim tswj.
- Raws li txoj kev tswj hwm cov ntaub ntawv, cov khoom siv tau muab faib ua cov lej, dynamic, ib theem thiab ntau theem. Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm qhov ua rau hauv kev tswj xyuas kev txheeb xyuas yog hloovpab kiag li lawm vim lub theem ntawm lub teeb liab los ntawm cov ntaub ntawv inputs, nrog dynamic tswj - nyob rau hauv kev hloov lub peev xwm los mus rau lub inputs ntawm lub semiconductor ntaus ntawv. Cov cuab yeej ib-theem muaj ib theem tswj, ob-theem cov cuab yeej muaj ob. Synchronous type triggers nrog ib-theem cia ntawm cov ntaub ntawv hu ua ib lub voj voog, feem, nrog ob-theem kaw - ob-lub voj voog.
- JK-flip-flop, RS-flip-flops, T-flip-flop, D-flip-flop thiab cov khoom siv ntawm lwm hom yog txawv los ntawm hom kev siv ntawm kev sib txuas lus.
Qhov tseem ceeb ntawm txhua hom kev cuam tshuam yog lub sijhawm ntev tshaj plaws ntawm cov teeb liab tawm tswv yim, lub sijhawm ncua sij hawm yuav tsum tau hloov lub cuab yeej, nrog rau lub sijhawm ua kom muaj zog.
Tim kev nkag siab hom npe
- R - txhais tau hais tias cais tawm tswv yim rau kev teeb tsa lub cuab yeej rau xoom xeev.
- S - hloov lub cuab yeej mus rau ib hom.
- K - cov tswv yim ntawm kev sib cais teeb universal ua rau xoom txoj hauj lwm.
- J - txhais tau tias cais hloov ntawm cov khoom siv hluav taws xob mus rau ib lub xeev.
- T - suav cov tswv yim ntawm lub cuab yeej.
- D - cov tswv yim rau kev hloov qhov txhais mus rau hom uas rov qab qib ntawm cov tswv yim.
- C - ntaus ntawv moos input.
- V - tus thawj coj, tso cai nkag.
hom kev cuam tshuam
- Asynchronous RS flip-flop. Cov cuab yeej no muaj ob lub xeev khov kho thiab ob lub tswv yim - R thiab S.
- T-tawg yog qhov feem ntauIb hom khoom siv nrov semiconductor, nws tsuas muaj ib qho ntaub ntawv (T) cov tswv yim, nws tseem hu ua suav ib qho. Lub synchronous RS flip-flop muaj kev tswj ntxiv (C) input.
- D-ua rau. Cov khoom siv ntawm hom no kuj muaj ib cov ntaub ntawv (D) cov tswv yim thiab sawv cev rau lub sijhawm ncua.
- DV-flip-flop yog, qhov tseeb, tib yam D-flip-flop, tab sis nrog ib qho ntxiv (V) tswj cov tswv yim.
- JK txhais. Cov khoom siv no txawv ntawm cov asynchronous nyob rau hauv uas thaum sib xyaw ua ke raug txwv tsis pub siv RS hom, lawv hloov cov ntaub ntawv khaws cia.
