Yakajairika USB yekubatanidza application system ine USB host, USB mudziyo uye USB tambo.Mu USB bhazi system, zvishandiso zvekunze zvinowanzobatanidzwa se USB midziyo, iyo inonyanya kupedzisa mabasa chaiwo, seanowanzo shandiswa U disk, mobile hard disk, mouse, keyboard, game controller, etc. Iyo USB host ndiye tenzi wehurongwa. uye ine basa rekutonga nekugadzirisa data mukuita kwekutaurirana kwe USB.Panguva yekufambisa kwe USB connector, data transmission kubva ku USB host kusvika kune USB device inonzi Down Stream communication, uye data data kubva ku USB device kusvika kune USB host inonzi Up Stream communication.
Zvakafanana neyakaiswa dhizaini dhizaini yeEthernet, iyo bhazi system ye USB yekubatanidza zvakare ine yakajeka akaturikidzana chimiro.Ndokunge, yakazara USB application system inogona kukamurwa kuita basa layer, mudziyo layer uye bhazi interface layer.
1. Basa rekushanda.Iyo basa layer inonyanya kuita basa rekufambisa data pakati peiyo USB host uye mudziyo mu USB yekubatanidza application system, iyo inoumbwa neiyo inoshanda unit ye USB mudziyo uye inoenderana USB host chirongwa.Iyo inoshanda dhizaini inopa mana marudzi ekufambisa data, anosanganisira Kudzora Transfer, Bulk Transfer, Interrupt Transfer uye Isochronous Transfer.
2. Equipment layer.Mu USB yekubatanidza sisitimu, iyo mudziyo layer ine basa rekutonga midziyo yeUSB, kugovera kero dzemidziyo yeUSB, uye kuwana zvinotsanangura mudziyo.Basa redhivha yedhivha rinoda rutsigiro rwevatyairi, USB zvishandiso, uye USB mauto.Muchikamu chemudziyo, mutyairi we USB anogona kuwana hunyanzvi hweiyo USB mudziyo.
3. Bus interface layer.Iyo bhazi interface layer inoziva iyo nguva yekutapurirana kwe USB data mu USB yekubatanidza system.Kufambiswa kwedhata rebhazi re USB kunoshandisa NRZI coding, iri reverse isingadzoke kune zero coding.Mu USB yekubatanidza bhazi interface layer, iyo USB controller inotakura otomatiki NRZI encoding kana decoding kuti ipedze iyo data data process.Iyo bhazi interface layer inowanzopedzwa otomatiki ne USB interface hardware.
Nguva yekutumira: May-31-2021