RS-jefa-Flop. Ka'idar aiki, aikin zane-zane, sauyin tebur

Fararwa - mai sauki na'urar ne wani digital na'ura. Yana yana da biyu jihar zaman lafiya. Daya daga cikin wadannan yanayi da aka sanya wani darajar "1", da kuma sauran - "0". Trigger yanayin, da darajar da binary bayanai da aka adana a cikinsu, da fitarwa sakonni aka ƙaddara: Direct da inverted. A cikin akwati inda kai tsaye fitarwa m da aka kafa, wanda yayi dace da wani dabaru daya, Jihar jefa-Flop kira naúrar (da yuwuwar a inverted fitarwa ne sifili). Idan kai tsaye fitarwa ne ba m, sa'an nan jawo yanayin da aka kira sifili.

Triggers suna classified ta da wadannan siffofin:

1. By Hanyar rikodin bayanai (synchronous da asynchronous).

2. Ta hanyar lura da bayanai (statistics, tsauri, guda-mataki, multistage).

3. By hanya na ganin na ma'ana sadarwa (JK-jefa-Flop, RS-triggers, T-Triger, D-jefa-Flop da sauran iri).

Babban sigogi na iri daban-daban triggers su ne mafi girma darajar da shigar da alama duration, da bata lokaci lokaci da ake bukata domin sauya sheka da jefa-Flop, da kuma barin aiki lokaci.

A cikin wannan labarin, bari mu magana game da irin wannan na'urar, kamar yadda RS-jefa-Flop. Su na iri biyu: synchronous da asynchronous.

Asynchronous RS-jefa-Flop yana da biyu Lines na gaskiya (R kuma S) shigar. Wannan na'urar aiki bisa ga mika mulki tebur.

An haramta irin jefa-Flop ne mai hade da sakonni a bayanai na na'ura, haddasa wata jiha na rashin tabbas. Wannan hade za a iya bayyana a matsayin wata bukata RtSt = 0. A minimizing da Karnaugh map nuna dokar jawo aiki, da ake kira da halayyar lissafi: Q (t + 1) = St V R'tQt. Kamar wancan RtSt ne sifili.

A cikin aikin zane yana nuna RS-jefa-Flop asynchronous irin Nand da kuma na biyu cika a kan kuma abubuwa.

Nau'i na biyu - synchronous RS-JJu. Irin wannan na'urar ne da fasali na uku kai tsaye bayanai S, R, kuma C. The bambanci tsakanin synchronous da asynchronous irin jefa-Flop ne kasancewar wani aiki tare da shigar da (C). Wajibi ne ga wadannan dalilai: saboda a cikin na'urar bayanai (dabaru kashi) sakonni ana aika ba ko da yaushe a lokaci guda. Wannan shi ne saboda cewa su wuce, ta hanyar daban-daban da kuma yawan nodes cewa suna da daban-daban jinkiri. Wannan sabon abu ne da ake kira "wasan." A sakamakon wannan "events" siginar dabi'u samu za a superimposed a baya dabi'u na sauran sakonni. Duk wannan take kaiwa zuwa da ƙarya ƙararrawa na'urorin.

Wannan sabon abu za a iya shafe ta da da ake ji da shigar da sakonni lokaci gating na'urar. Wato, a shigar da Nand ƙofar fãce kai tsaye bayanai sakonni kawota key aiki tare hatsaisai, wannan lokaci bayanai zuwa shigar da sakonni da lokacin da za a kulle uwa da labari.

Babban sharadin daidai aiki na sauya sheka dabaru, saukarwa a cikin RS-jefa-Flop da dabaru sarrafawa da su - RT unacceptability lokaci daya mataki ko sigina St, wani sharuddan sauyawa na'ura, da kuma bayanai gyara daga fitarwa Q (t + 1) jefa-Flop. A wannan batun, da m jerin ƙunshi kawai synchronous abubuwa.

RS-type jefa-Flop synchronous halayyar wakilta lissafi: Q (t + 1) = StCt V R'tQt V QtC't.

A hoto na nuna RS-jawo synchronous irin Nand. Input AND ƙofofi, BA ma'ana naúra tana daukar kwayar cutar zuwa sharuddan sauyawa data shigar S ko R ga zama dole bayanai asynchronous RS rubuta sakata da inverted shigar kawai a lokacin da labari ya synchronous (C) siginar a dabaru daya.