USB 3.2 Nrov Science (Part 2)

USB 3.2 Nrov Science (Part 2)

Nyob rau hauv USB 3.2 specification, lub high-ceev feature ntawm USB hom-C yog tag nrho siv. USB Hom-C muaj ob qhov kev sib kis cov ntaub ntawv ceev ceev, muaj npe (TX1+/TX1-, RX1+/RX1-) thiab (TX2+/TX2-, RX2+/RX2-). Yav dhau los, USB 3.1 tsuas yog siv ib qho ntawm cov channel xa cov ntaub ntawv, nrog rau lwm cov channel uas twb muaj lawm ua thaub qab. Hauv USB 3.2, ob txoj kev tuaj yeem qhib tau raws li qhov tsim nyog thiab ua tiav qhov siab tshaj plaws kis tau tus mob ntawm 10 Gbps rau txhua qhov channel, ua rau tag nrho 20 Gbps. Nrog 128b / 132b encoding, qhov tseeb cov ntaub ntawv ceev tuaj yeem ncav cuag kwv yees li 2500 MB / s, uas yog ob npaug ncaj qha piv rau USB 3.1 tam sim no. Nws yog ib nqi sau cia hais tias lub channel hloov nyob rau hauv USB 3.2 yog kiag li seamless thiab tsis yuav tsum tau tshwj xeeb kev khiav hauj lwm los ntawm tus neeg siv.

Lub teeb liab thiab thaiv kev ua cov txheej txheem ntawm USB3.1 cable zoo ib yam li ntawm USB3.0. Lub impedance tswj ntawm SDP shielded sib txawv kab yog tswj ntawm 90Ω ± 5Ω, thiab ib leeg-kawg coaxial kab yog tswj ntawm 45Ω ± 3Ω. Qhov ncua sij hawm sab hauv ntawm tus khub sib txawv yog tsawg dua 15ps / m, thiab lwm qhov kev poob qis thiab lwm yam ntsuas tau ua raws li USB3.0. Cov qauv cable raug xaiv raws li daim ntawv thov scenario thiab kev ua haujlwm thiab qeb yuav tsum: VBUS: 4 xov hlau los xyuas kom meej qhov ntws ntawm qhov hluav taws xob thiab tam sim no; Vconn: txawv ntawm VBUS, nws tsuas yog muab qhov voltage ntawm 3.0 ~ 5.5V; tsuas yog muab lub zog rau lub nti ntawm lub cable; D + / D-: USB 2.0 teeb liab; los txhawb rau pem hauv ntej thiab thim rov qab ntxig, muaj ob khub ntawm cov cim ntawm lub qhov (socket) sab; TX+/- thiab RX+/-: 2 pawg ntawm cov teeb liab, 4 khub ntawm cov teeb liab, txhawb nqa pem hauv ntej thiab thim rov qab; CC: teeb liab teeb tsa, lees paub thiab tswj kev sib txuas ntawm qhov chaw thiab lub davhlau ya nyob twg; SUB: nthuav dav muaj nuj nqi teeb liab, tuaj yeem siv rau lub suab.

Yog hais tias lub impedance ntawm shielded sib txawv kab yog tswj ntawm 90Ω ± 5Ω, thiab ib coaxial kab yog siv, lub teeb liab av rov qab los ntawm lub shielded GND. Rau ib qho kawg coaxial kab, lub impedance yog tswj ntawm 45Ω ± 3Ω. Txawm li cas los xij, kev xaiv ntawm cov ntsiab lus txuas thiab cov qauv cable nyob ntawm qhov kev thov scenarios thiab qhov ntev ntawm cov cables sib txawv.

USB 3.2 Gen 1 × 1 - SuperSpeed, 5 Gbit / s (0.625 GB / s) cov ntaub ntawv qhia tus nqi tshaj 1 txoj kab siv 8b / 10b encoding, tib yam li USB 3.1 Gen 1 thiab USB 3.0.
USB 3.2 Gen 1 × 2 - SuperSpeed ​​+, tshiab 10 Gbit / s (1.25 GB / s) cov ntaub ntawv tus nqi tshaj 2 txoj kab siv 8b / 10b encoding.
USB 3.2 Gen 2 × 1 - SuperSpeed ​​+, 10 Gbit / s (1.25 GB / s) cov ntaub ntawv tus nqi tshaj 1 txoj kab siv 128b / 132b encoding, tib yam li USB 3.1 Gen 2.
USB 3.2 Gen 2 × 2 - SuperSpeed ​​+, tshiab 20 Gbit / s (2.5 GB / s) cov ntaub ntawv tus nqi tshaj 2 txoj kab siv 128b / 132b encoding.