USB (Universal Serial bus) tom qab caum lub xyoo ntawm txoj kev loj hlob, tau dhau los ua siv dav hauv cov qauv ntawm tus kheej lub computer. Nco sticks, mobile hard drives, nas thiab webcam yog tag nrho cov kev cob cog rua ntawm USB. Cov tshooj no delves rau hauv USB lub suab: tus txheej txheem siv lub tshuab hluav taws xob los siv hauv cov PCs, smartphones, thiab cov ntsiav tshuaj rau cov suab paj nruag xws li cov neeg tham, microphones, lossis consoles. Tsab ntawv xov xwm no piav qhia txog tias USB suab ua haujlwm zoo li cas, dab tsi yuav xyuam xim, thiab yuav siv USB suab li cas rau cov yas qiv ntau hauv cov khoom tawm thiab tso zis.
Hloov tsheb thauj mus los siv rau kev hloov ntaub ntawv ntawm cov khoom siv thiab cov khoom siv. Tag nrho USB transmissions muaj CRC (checksum) uas qhia tau hais tias seb ib qho yuam kev tshwm sim. Hauv kev sib kis ua ke, CRC yuav tsum raug tso cai ntawm qhov kawg ntawm cov ntaub ntawv. Yog tias CRC yeej muaj tseeb, txoj kev sib kis tau teb, thiab cov ntaub ntawv yog xav tias tau raug xa tawm. Yog tias CRC tsis muaj tseeb, qhov kev tshais chaw yuav tsis teb thiab yuav rov qab tau dua.Thaum Sketchpad
Yog hais tias tus ntaus ntawv tsis npaj kom tau txais cov ntaub ntawv, nws yuav xa ib qho lus teb tsis zoo (NAK) qhov teeb meem uas yuav ua rau tus tswv tsev kom rov qab sib kis dua. Hloov tsheb thauj mus los tsis suav hais tias yuav tsum muaj lub sij hawm-tsim nyog, yog li ntawd lawv yuav tsum teem sijhawm kom muaj kev sib tham hauv cov chaw nram qab no, nrog rau lub sij hawm tsim nyog rau ntau yam kev sib kis. Synchronous transmissions yog siv los kis cov ntaub ntawv nyob rau ntawm lub sij hawm ntawm hom thiab cov cuab yeej siv.Thaum Sketchpad
Txoj kev sib kis raug siv los ntawm tus tswv tsev rau periodically nug rau hauv lub cuab yeej kom paub tias yog ib yam dab tsi tsim nyog tau tshwm sim. Piv txwv, tus tswv tsev thiaj li nug txog lub cuab lub suab thiab xyuas seb lub pob ntseg (lub muting) khawm tau nias. Hloov Txais Cov npe no kuj nce mentsis vim nws tsis cuam tshuam dab tsi. Txawm li cas los, lub periodic nug ntawm cov ntaub ntawv muab tib hom kev functionality uas lub koom txoos cuam tshuam yuav muab.Audio Sketchpad
Lwm yam xov xwm
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