RS-mungaimitse-phidigu. Mfundo ntchito zinchito zithunzi, kusintha tebulo

Hule - chipangizo chophweka ndi makina yadigito. Iwo ali awiri bata boma. Chimodzi mwa zinthu izi akapatsidwa mtengo "1", ndi zina - "0". Choyambitsa chikhalidwe, ndi mtengo mfundo bayinare amene kusungidwa mmenemo, ndi chizindikiro linanena bungwe anatsimikiza: Direct ndi kukalowa. Ngati kumene mwachindunji angathe linanena bungwe udzakhazikitsidwe womwe ndi mfundo imodzi, boma la pepala-kulephera otchedwa unit (kuthekera pa linanena bungwe kukalowa ndi ziro). Ngati linanena bungwe mwachindunji si kuthekera, ndiye chikhalidwe choyambitsa amatchedwa ziro.

Akapsa anawagawira ndi mbali zotsatirazi:

1. Ndi njira kungosunga zomwe tamva (synchronous ndi asynchronous).

2. Mogwiritsa ntchito mfundo ulamuliro (ziwerengero zazikulu, osakwatira gawo, multistage).

3. Ndi njira ya kukwaniritsidwa kwa kugwirizana zomveka (JK-pepala-kulephera, RS-akapsa, T-Triger, D-pepala-kulephera ndi zina).

Magawo waukulu mitundu yonse ya akapsa ndi mtengo waukulu wa athandizira nthawi chizindikiro akuchedwa nthawi wofunikila kusintha pa pepala-kulephera, ndi kulola ntchito nthawi.

M'nkhani ino, tiyeni tikambirane za mtundu wa chipangizo, monga RS-pepala-kulephera. Iwo ali a mitundu iwiri: synchronous ndi asynchronous.

Asynchronous RS-pepala-kulephera ali mizere iwiri constructively (R ndi S) athandizira. chipangizo ichi ukugwira ntchito monga tebulo kusintha.

Analetsa kuti ngati pepala-kulephera ndi osakaniza chizindikiro pa zolowetsa chipangizo, ndi kuchititsa kuti boma njakata. kuphatikiza tingasonyezere monga chofunika RtSt = 0. Mu kuchepetsa mapu Karnaugh anasonyeza malamulo choyambitsa opareshoni, ndilo lotchedwa aone kuti pali khalidwe: Q (T + 1) = St V R'tQt. Choncho RtSt ndi ziro.

Pa chithunzi zinchito zikusonyeza RS-pepala-kulephera asynchronous mtundu NAND ndi ntchito chachiwiri pa zinthu kapena.

Mtundu chachiwiri - synchronous RS-FF. Chotero chipangizo ndi amapanga zinthu zitatu zolowetsa mwachindunji S, R, ndi C. Kusiyana pakati pa synchronous ndi asynchronous mtundu pepala-kulephera ndi kukhalapo kwa athandizira ndi kalunzanitsidwe (C). M'pofunika pa zifukwa zotsatirazi: chifukwa zolowetsa chipangizo (mfundo mchitidwe) chizindikiro amatumizidwa si nthawi imodzi. Ichi ndi chifukwa chakuti iwo kudutsa mitundu yosiyanasiyana ndipo chiwerengero cha mfundo kuti ndi kuchedwa osiyana. zodabwitsazi amatchedwa "machesi." Chifukwa za "zinthu" mbendera mfundo analandira adzakhala superimposed pa mfundo m'mbuyomu za zizindikiro zina. Zonsezi zimathandiza munthu zipangizo onyenga Alamu.

zodabwitsazi angathe kuthetsedwa mwa kutsatila athandizira chizindikiro nthawi gating chipangizo. Ndiko kuti, Muzifunsa NAND chipata kupatula mwachindunji mauthenga chizindikiro aziwapatsa nyemba kiyi synchronizing, izi mudziwe nthawi chizindikiro athandizira nthawi logwirana kumtunda athandizira lapansi.

The chikhalidwe chachikulu chifukwa ntchito olondola a kusintha magawo mfundo mu RS-pepala-kulephera ndi mfundo olamulidwa ndi iwo - RT unacceptability munthawi yomweyo kanthu kapena chizindikiro St, chipangizo kusinthitsa, ndi zambiri katengedwe ku linanena bungwe Q (T + 1) mungaimitse-phidigu. Pankhaniyi, zakuti angathe lili zinthu kokha synchronous.

RS-mtundu pepala-kulephera synchronous khalidwe ukufanizidwa ndi aone kuti pali: Q (T + 1) = StCt V R'tQt V QtC't.

chithunzi limasonyeza RS-choyambitsa synchronous mtundu NAND. Lowetsani zipata, si zoona wagawo imafalikira kuti deta kusinthitsa athandizira S kapena R kwa zolowetsa zofunika RS asynchronous lembani latch ndi athandizira Imatithandiza kokha pamene athandizira kwa synchronous (C) mbendera pa mfundo imodzi.