Lub txhais - yog ib lub tsev cov tshuab

Txhais - yog ib tug yooj yim ntaus ntawv yog ib cov tshuab. Nws muaj ob lub xeev stability. Ib tug ntawm lawv yog teem rau "1", thiab lwm - "0". Txhais mob, thiab tus nqi ntawm cov binary ntaub ntawv uas yog cia nyob rau ntawd, tso zis rau Pib ntsais koj teeb yog txiav txim: Direct thiab inverted. Yog hais tias qhov ncaj tso zis muaj ib tug tej zaum coj mus rau ib tug logic ib tug, ces xws li ib tug lub xeev yog hu ua tus txhais unit (lub inverted lub teeb liab theem ntawm cov qhov tso zis raws li ib tug muaj kuab pes tsawg). Yog hais tias lub tsev yog tsis, xws li ib tug raws li txoj cai ntawm tus dais no yog hu ua ib tug pes tsawg.

Txhais Hom. kev faib

1. Raws li cov ntaub ntawv cov ntaubntawv povthawj siv txoj kev emit asynchronous thiab synchronous chiv keeb tuaj. Nyob rau hauv asynchronous switching pab kiag li lawm no tshwm sim thaum uas nkag mus rau cov ntaub ntawv tseg rau lub inputs. Nyob rau hauv lub synchronous tas li ntawd mus rau lub cov ntaub ntawv, muaj kev tswj inputs (ib tug los yog ob peb). Cov yam chiv keeb tuaj yog hloov thaum ua ntawv thov rau cov kev tswj Pib ntsais koj teeb.
2. Nyob rau hauv analogy rau qhov uas tswj ntaus ntawv nyob rau hauv statistical cov ntaub ntawv muab qhia, dynamic hluas thiab multistage. Lub hauv paus ntsiab lus ntawm cov lag luam thaum tus txhais no nyob rau hauv statistical tswj switching ntaus ntawv los ntawm lub teeb liab theem tawm tswv yim rau cov ntaub ntawv inputs, nrog dynamic tswj - kev hloov nyob rau hauv potentials thov mus rau inputs ntawm ib tug semiconductor ntaus ntawv. Ib leeg-theem li muaj ib tug tswj theem, ob-theem - ob. synchronous yam uas ib yam cim ntawm cov ntaub ntawv no yog hu ua ib tug tib-cycle, ntsig txog, nrog ib tug ob-theem nkag - ob-mob stroke.
3. Raws li lub hom realization ntawm cov zajlus kom sib txuas cais JK-flip-ntog, RS-chiv, T-flip-ntog, D-flip-flop thiab pab kiag li lawm ntawm lwm hom.

Lub ntsiab tsis ntawm tag nrho cov hom ntawm yam chiv keeb yog nyiaj pab ntau tshaj cov tswv yim teeb liab ntev, qhov kev ncua sij hawm yuav tsum tau rau lub switching ntaus ntawv thiab tas lub lag luam lub sij hawm.

Designating hom txhais inputs

• R - txhais tau tias nyias muaj nyias kev tswv yim ntaus ntawv ntsia tau rau hauv lub voj hauv lub xeev.
• S - lub switching ntaus ntawv nyob rau hauv ib hom.
• K - nkag qhia universal txhais chaw rau zero.
• J - txhais tau tias nyias muaj nyias ib switching semiconductor ntaus ntawv nyob rau hauv ib lub xeev.
• T - suav cov tswv yim ntaus ntawv.
• D - switching txhais tswv yim hom, rov qab ua dua lub tswv yim theem.
• C - synchronizing tswv yim ntaus ntawv.
• V - tswj, muag txog cai rau cov tswv yim.

Lub ntsiab yam ntawm chiv

1. Asynchronous RS-flip-ntog. Qhov no ntaus ntawv muaj ob tug ruaj khov lub xeev thiab cov ob inputs - R thiab S.
2. T-txhais - lub feem ntau nrov hom semiconductor pab kiag li lawm, nws tsuas muaj tib ntaub ntawv (T) input, tsis tau nws yog hu ua schetnym.Sinhronny RS-flip-ntog muaj ib tug ntxiv tswj (C) cov tswv yim.
3. D-flip-ntog. Devices ntawm no hom kuj muaj ib tug cov ntaub ntawv (D) input thiab sawv cev rau lub sij hawm ncua.
4. DV-txhais - yog, nyob rau hauv essence, tib D-flip-ntog, tab sis muaj ib tug ntxiv (V) tswj cov tswv yim.
5. JK-flip-ntog. Qhov no hom ntawm ntaus ntawv txawv los ntawm asynchronous nyob rau hauv uas ib tug nqi ntawm cov tsis muaj-RS-hom ntaus ob peb ua ke yog inverted muab cov ntaub ntawv.