USB4 LRD Active Cable Test Thiab Certification

Lub USB4 nquag cable specification ua raws li USB hom-C connector thiab cable spec. tam sim no, qhov tseeb version yog Rev. 2.1. Lub ntsiab lus ntawm EPR (txuas ntxiv fais fab ntau yam) cable yog ntxiv, thiab ECN (engineer hloov daim ntawv ceeb toom) ntawm yav dhau los active cable yog kev koom ua ke rau hauv no version. Cia's saib ntawm USB hom-C active cable.

USB 3.2 Short Active Cable

USB4 Short Active Cable

USB 3.2 Optically Isolated Active Cable (OIAC)

Ntawm lawv, OIAC yog ib qho fiber ntau optical cable nrog qhov ntev ntawm 50 meters. Tam sim no, nws tau txhais tias nws tuaj yeem txhawb USB 3.2 Gen2 ceev ntawm feem ntau (tab sis tsis txhawb USB2.0 thiab VBUS fais fab mov), uas yog siv rau kev lag luam kawg, tshuab tsis pom kev, chaw taws teeb sensors, kev yees duab thiab kev siv kho mob. Txawm li cas los xij, cov lus qhia hluav taws xob ntawm USB4 linear optical active cable tsis tau txhais; Tom ntej no, peb yuav qhia txog ib feem ntawm luv luv active cable.

luv active cable active cable

Hauv qhov ntev ntawm 5 meters

Tag nrho cov yam ntxwv hom-C thiab USB PD 3.0 eMarker yuav tsum tau ua

Nws yuav tsum tau txhawb nqa ob txoj hauv kev thiab qhov zoo thiab qhov tsis zoo

Raws li kev txhawb nqa muaj peev xwm, nws tuaj yeem muab faib ua USB 3.2 thiab USB4 active cables

USB 3.2 active cable:

-USB 3.2 Gen 2x2 (10GHz dual channel) yuav tsum tau txais kev txhawb nqa

* Cov kab hluav taws xob nquag txhawb nqa tsuas yog ib qho channel (x1) tsis raug tso cai

-Alt hom xaiv yeem txhawb nqa

USB4 active cable:

-Txhua USB 3.2 thiab USB4 ceev (dual channel) yuav tsum tau txais kev txhawb nqa

-Tbt3 alt hom yuav tsum tau txais kev txhawb nqa

Cov xaim xaim ntawm VBUS, vconn, CC thiab USB 2.0 yog raws li qhov yuav tsum tau ua ntawm passive cables

Lub active cable yuav tsum tau powered los ntawm vconn

Cov kab hluav taws xob nquag muaj cov khoom siv rov ua dua tshiab, xws li re timer lossis rov tsav tsheb, feem ntau yog rau cov teeb liab ceev TX1, TX2, rx1 thiab rx2. Re timer kev loj hlob yog complex thiab kim. Lub linear re driver cable (LRD) dominated los ntawm re tsav tsheb muaj cov yam ntxwv ntawm tsis tshua muaj complexity, tsawg zog noj thiab tsawg nqi. Txawm hais tias nws tsuas yog tom qab ntxiv rau USB ecosystem thiab suav nrog USB hom-C specification, LRD cable yog thawj zaug nkag rau hauv kev ua lag luam. Piv txwv li, 40Gbps ob meter thunderbolt 4 cable yog LRD cable txhawb USB4.

Cov khoom tseem ceeb ntawm LRD cable suav nrog RX vaj huam sib luag thiab tso zis tsav tsheb, uas yog lub luag haujlwm rau kev them nyiaj cable poob, kho DC nce, thiab kho qhov loj ntawm cov zis ua ntej tseem ceeb thiab teeb liab, raws li qhia hauv daim duab hauv qab no.

Txij li thaum LRD cable tsis muaj CDR ( moos cov ntaub ntawv rov qab), jitter thiab suab nrov tau txais ntawm lub cable input yuav raug xa mus rau cable tso zis; Tib lub sijhawm, RX EQ kuj tseem tuaj yeem ua kom nrov nrov nrov; Vim yog qhov sib ntxiv ntawm cov khoom nquag, lub impedance ntawm daim npav ncoo yuav tsis txuas ntxiv; Raws li cov cables ntev, nws yog ib qho yooj yim uas yuav ua rau ntev mismatch thiab loj pn skew nyob rau hauv cov txheej txheem ntau lawm, ua rau AC hom hom tshaj qhov specification. Raws li cov ntsiab lus saum toj no, cov hauv qab no yuav tsum tau txiav txim siab hauv kev tsim:

High zaus suab nrov tshwm sim los ntawm cables

Seb EQ nyob rau hauv lub cable puas yog sib npaug, thiab seb lub teeb liab tsis txaus los yog sib npaug?

Impedance txuam ntawm cov khoom siv ntxiv hauv cov kab hluav taws xob nquag

Pn skew ntawm cable kev kub ceev khub

LRD cable muaj nuj nqi txhawb thiab eMarker tshaj tawm

Nws tau teev nyob rau hauv rooj 6-3 ntawm USB hom-C connector& cable Rev 2.1 specification (raws li qhia hauv Table 2), USB4 passive cable thiab USB4 active cable (tshwj tsis yog OIAC) yuav tsum txhawb USB4, usb3, USB2 thiab tbt3.

Tshwj xeeb, USB4 LRD cable yog active cable, tab sis nyob rau hauv tus ID header VDO teeb tsa ntawm eMarker, B29... B27 yuav tsum tau tshaj tawm tias passive cable (011b) thiab tshaj tawm siv passive cable VDO. Vim tias LRD cable tau muab tso rau hauv USB cov lus qhia tom qab, nws yog qhov tseem ceeb tshaj plaws rau tbt3 cov khoom lag luam hauv khw. Nws yuav tsum tau tshaj tawm tias passive. Txawm hais tias cov khoom lag luam tau tshaj tawm tias yog passive, tbt3 discovery yuav txuas ntxiv hauv cov txheej txheem kev sib txuas lus ntawm USB4 discover_ SVID (0x8087), thiab txiav txim seb nws puas yog" USB4 nrog tbt3 gen3 active cable".

Usb-yog tso tawm tshiab USB4 logo thiab Icon

Usb-yog tuav lub rooj sib tham USB devdays 2021 hauv Seattle (Lub Cuaj Hli 30 txog Lub Kaum Hli 1), thiab tso tawm lub logo tshiab thiab lub cim ntawm lub zog ntsuas ntawm USB hom-C cable ua ke nrog EPR (ntxiv lub zog ntau yam) specification, raws li qhia hauv cov lus hauv qab no, kom cov neeg siv tuaj yeem txheeb xyuas qhov ceev thiab lub zog txhawb nqa los ntawm cov khoom siv USB. Lub cable Ameslikas txhawb 100W (20V / 5A) tsis siv lawm; Cable txhawb 5A yuav tsum txhawb EPR 240W (48V / 5A).

Table 3: Cov ntawv pov thawj tshiab USB hom-C cable logo thiab icon (qhov chaw: usbdevdays 2021)

Lub LRD cable active cable ntxiv ib qho active tivthaiv re tsav tsheb kom lub cable txhawb ntev ntev. Hauv kev siv tswv yim thiab kev xeem ntawv pov thawj, lub tswv yim yog tias qhov kev ua tau zoo ntawm LRD cable yuav tsum zoo ib yam nrog lossis txawm zoo dua li ntawm passive cable. Ntawd yog, nyob rau hauv tib qhov kev sim qhov chaw teeb tsa, lrdcable yuav tsum sib npaug los yog zoo dua li passive cable thaum piv nrog passive cable.

LRD daim ntawv pov thawj cov khoom muaj xws li:

Usb-c functional test

USB PD e-marker xeem

Lub zog siv hluav taws xob: IR poob thiab kev siv hluav taws xob

Kev tiv thaiv thermal overheat

LRD cov yam ntxwv hluav taws xob kuaj

LRD cable compatibility test (tseem tab tom sib tham)

Cov ncauj lus kom ntxaws LRD cable hluav taws xob kuaj yog raws li hauv qab no:

1. Usb-c functional test

Raws li usb-c function test specification, lub cable xeem yog raws li nram no:

TD 4.1.3 Unpowered Cable Test

TD 4.13.5 Cable EnterUSB thiab Data Reset Test

TD 4.14.x

TD 4.14.1 Cable Vconn Swap Test

TD 4.14.2 Cable Reset Test

TD 4.14.3 Cable Alternate Mode Test

TD 4.14.4 Cable USB 3.2 Test

TD 4.14.5 Cable USB4 Test

2. USB PD: e-marker xeem

Raws li USB PD CTS, sim peb yam nram qab no ntsig txog cable:

Cov txheej txheem thiab kev kuaj xyuas

Cov Txheej Txheem Lub Cev Tshwj Xeeb

Cov kev xeem tshwj xeeb raws tu qauv

LRD cable xav tau kev txhawb nqa tbt3 thiab paub meej tias qhov kev tshaj tawm tbt3 thiab SOP cov lus teb puas yog

Cable SOP'Discover Identity teb

[ID Header VDO] B26 (tus qauv ua haujlwm) teem rau 1b (alt mode)

[ID Header VDO] B29..27 ( yam khoom) teem rau 11b (passive cable)

[Cable VDO] B2..0 (USB siab tshaj plaws ceev) teem rau 010b (USB3.2/USB4 Gen2)

Cable SOP' TBT Discover Mode VDO teb

B20..19 (puag / rounded& tsis muaj) teem rau 01b (ob leeg)

B21 (Optical / tsis muaj) teeb rau 0 (tsis muaj)

B22 (Re-timer / Re-driver) teem rau 0b (Re-tsav tsheb)

B23 (Uni/Bi-directional) teem rau 1b (Uni)

B25 (Active/Passive) rau 1b (Active)

3. Cov kev xav tau ntawm lub zog hluav taws xob

3.1. IR poob specifications ntawm VBUS thiab av cables yog tib yam li cov passive cables

VBUS IR poob: ≤500mV

Hauv av IR poob: ≤250mV

3.2. Lub hwj chim mov ntawm lub active cable yog tsuas yog los ntawm vconn, thiab lub siab tshaj plaws zog noj yog txwv

Lub zog siv los ntawm vconn ≤ 1.5W

4. Kev ntsuas kub

Rau kev nyab xeeb vim li cas, qhov ntsuas kub yuav tsum tau teeb tsa hauv lub tshuab hluav taws xob. Thaum qhov kub ntawm lub plhaub yas ntawm lub active cable nce mus txog 80 ℃ ˚ C los yog hlau nto kub txog 55 ˚ C. USB 3.2 / usb4 cov ntaub ntawv hloov tsheb yuav tsum tau nres.

Tsis tas li ntawd, qhov kub thiab txias ntawm lub active cable plug thiab lub siab tshaj plaws ua hauj lwm kub ntawm lub plhaub nto yuav tsum tsis txhob tshaj qhov kub ntawm ambient los ntawm 30 ℃ ˚ C. Los yog hlau plhaub nto kub 15 ˚ C.

Qhov kub thiab txias (TS) ntawm lub plhaub yas ntawm lub tshuab hluav taws xob feem ntau suav nrog qhov kub thiab txias ua haujlwm (TMB) ntawm tus tswv tsev txuas nrog thiab cov khoom siv motherboard, cov khoom siv hauv cov cable, thiab qhov ntsuas kub tam sim no (TA). Qhov kev xeem ntawv pov thawj tiag tiag yog muab faib ua ob ntu: qhov kub thiab txias (TS) thiab thermal kaw. Qhov chaw xeem tau pom nyob rau hauv daim duab hauv qab no:

4.1 Qhov kub thiab txias (Ts)

qhov kub thiab txias

Raws li pom hauv daim duab 3, sim qhov kev sib txuas, simulate tus tswv tsev / ntaus ntawv motherboard los ntawm lub thermal test fixture heater board nyob rau hauv chav tsev kub, thiab cia lub TMB kub nce mus rau (TA + 25) ˚ C) Ces txuas lub active cable thiab teem lub tag nrho cov khoom thauj los ntawm tus tswv tsev mus rau lub cuab yeej (nrog rau cov ntaub ntawv sib kis ceev ceev thiab PD 100W load). Lub sijhawm no, siv lub koob yees duab infrared txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau nws, koj yuav tsum siv lub koob yees duab infrared kom paub qhov kub siab tshaj plaws ntawm qhov ntsaws cable (Fig. 4), thiab lo rau" thermal ob peb" thaj tsam ntawm qhov kub siab no rau kev ntsuas kub (Fig. 5). Tshawb xyuas qhov kub thiab txias ntawm lub plhaub yas ntawm lub cable ntsaws, thiab txiav txim seb qhov kev xeem dhau los: TS< ta="" +="" 30="" ˚="">

Daim duab 4: lub koob yees duab infrared kom pom qhov chaw kub siab tshaj plaws

Daim duab 5:" ThermalCouple" thaj ua rau thaj chaw kub tshaj plaws.

4.2 thermal shutdown overheating tiv thaiv

Qhov chaw sim rau kev tiv thaiv overheating yog tib yam li saum toj no. Tsis tas li ntawd, cov cua sov thaj yog coated rau ntawm lub plhaub yas ntawm cable plug (Fig. 6). Pib cua sov lub tshav kub ntawm chav tsev kub. Thaum qhov kub thiab txias nce mus txog 85 ℃ ˚ C, cov txiaj ntsig tau txiav txim siab: active cable yuav tsum nres USB 3.2 / usb4 cov ntaub ntawv xa mus.

Daim duab 6: hloov tau lub tshuab cua sov cua sov thaj

Nco tseg: rau cov khoom siv hluav taws xob ntsuas hluav taws xob thiab cov khoom siv cuam tshuam, thov hu rau OD Liao@luxshare -ict.com

Hluav taws xob kuaj

Rau LRD cable, passive cable tseem siv nyob rau hauv USB 2.0, SBU thiab CC cable configuration. Txoj kev xeem thiab cov lus qhia tshwj xeeb yog tib yam li cov kab mob passive. Lub high-ceev teeb liab khub TX1 / rx1 / TX2 / rx2 yog txawm peem rau nrog re driver active Cheebtsam. Cov kev ntsuas tshwj xeeb yog raws li LRD nquag cable CTS version 0.8. Cov khoom xeem tau muab faib ua peb yam hauv qab no:

Frequency domain test

Lub sij hawm sau - cable stand alone cable test

Lub sij hawm sau - cable tso zis qhov muag kuaj

5.1 zaus domain test

Integrated Rov Losss (IRL)

Integrated Multi-Reflection (IMR)

Channel Operation Margin (COM)

Daim duab 7: daim duab kev sib txuas ntawm S tsis tau ntes los ntawm VNA ntawm vector network analyzer

Rau cov khoom siv ntsuas zaus, cov qauv ntsuas yog tib yam li cov kab hluav taws xob passive. S tsis yog muab los ntawm vector network analyzer VNA. Muaj 8 s4p cov ntaub ntawv (TX1 / rx1 / TX2 / rx2, bidirectional) rau kev sib txawv ntawm qhov sib txawv, thiab los ntawm get_ iPar_ V0p91a software rau kev tsom xam.

5.2 lub sijhawm sau - cable sawv ib leeg kuaj

Cable ilfit mask (DC / F1 / NQ / F2 / F3 / WB): insertion poob

OUTPUT_ Suab nrov (): tus qauv sib txawv ntawm cov suab nrov (tsis suav nrog cov suab nrov nrov)

SIGMA_E (𝝈): tus qauv sib txawv ntawm cov zis tsis tawm suab nrov

Cable CM_ Suab nrov: AC hom hom

Kev ntsuas lub cev ntawm lub cev (tsis suav nrog ISI thiab jitter) feem ntau kuaj qhov kev poob qis, tawm suab nrov, tsis muaj suab nrov thiab AC hom ntawm lub cable nws tus kheej. Qhov kev sib txuas ntawm kev xeem yog qhia hauv daim duab hauv qab no. Raws li TP2 tso zis (raws li qhia hauv Table 4) qauv, viav vias, tsis muaj jitter, tsis muaj SSC, tsis muaj TX EQ nqis, xws li" qauv: prbs15, viav vias 800mv, SSC tawm, jitter tawm, preset 0 [GG ] quot;, lub teeb liab lub tshuab hluav taws xob ua ntej txuas qhov phem tshaj plaws passive cable rau kev sim, oscilloscope captures lub waveform *. Bin, tom qab ntawd hloov mus rau LRD cable rau kev sim, thiab ua raws li kev ntsuas ntsuas hauv qab no los ntawm software, Tom qab ntawd sib piv LRD cable. Cov txiaj ntsig kev xeem yuav tsum sib npaug los yog zoo dua li qhov passive cable. Qhov kev sim yuav tsum npog peb qhov ceev: USB4 Gen2 / gen3 thiab USB 3.2 Gen2.

Lus Cim:" phem tshaj cov ntaub ntawv passive cable" hais txog lub passive cable nrog qhov siab tshaj qhov nkag tsis tau nyob rau hauv cov lus qhia cable, xws li 1m USB 3.2 Gen2 passive cable, 2m USB4 Gen2 passive cable thiab 0.8m USB4 gen3 passive cable.

Daim duab 8: daim duab txuas rau kev kuaj lub cev cable

5.3 lub sij hawm sau - cable tso zis qhov muag daim duab kuaj

(Cable output Qhov muag Test)

5.3.1. USB4 Gen2 / gen3 xeem:

Kev sib txuas ntawm cable tso zis qhov muag daim duab kuaj (nrog rau qhov system ISI thiab jitter) yog qhia hauv daim duab hauv qab no. Qhov chaw xeem yog tib yam li USB4 party / ntaus ntawv RX receiver authentication test ib puag ncig. Qhov chaw kuaj USB4 RX yuav tsum tau kho ua ntej. Koj tuaj yeem ncaj qha tswj lub Anritsu mp1900 qauv generator los ntawm grl-usb4-rx test app, raws li qhia hauv daim duab 9, Calibrate USB4 RX xeem ib puag ncig nrog keysight lossis Tektronix oscilloscope.

Tom qab calibration, txuas lub" cov ntaub ntawv phem passive cable" thawj zaug thaum kuaj. Qhov kev sim teeb tsa suav nrog kev tso tawm prbs31 hauv qauv Gen thiab teeb tsa USB4 preset (16 pawg hauv tag nrho). Tom qab lub teeb liab hla lub cable, ntes tsib waveforms nyob rau hauv oscilloscope, thiab 80 waveforms yuav tsum tau ntes nyob rau hauv txhua pab pawg neeg ntawm kev kub ceev; Tom qab ntawd, nyob rau hauv tib txoj kev sim, tshem tawm cov kab mob passive, hloov LRD cable, thiab ntes cov waveform ntawm oscilloscope; Tom qab ntawd lub qhov muag daim duab, qhov muag dav thiab qhov muag cheeb tsam tau sim thiab tshuaj xyuas nrog USB4 sigtest software.

Daim duab 10: USB4 gen3 / Gen2 cable tso zis qhov muag daim duab kuaj kev sib txuas

USB4 kev txiav txim siab ntawm Gen2 / gen3 xeem tau (nruab nrab ntawm 5 captures):

LRD cable zoo tshaj qhov muag cheeb tsam ≥ passive cable zoo tshaj plaws qhov muag

Thiab qhov muag dav ntawm LRD cable ≥ 0.9 * passive cable

1.3.2. USB Gen2 Test:

Qhov chaw sim yog tib yam li usb3.2 RX receiver authentication test ib puag ncig. USB 3.2 RX xeem ib puag ncig yuav tsum tau kho ua ntej (raws li qhia hauv daim duab 11). Lub tshuab hluav taws xob Anritsu mp1900 tuaj yeem tswj tau ncaj qha los ntawm grl-usb3-rxtest app thiab calibrated nrog keysight lossis Tektronix oscilloscope

Tom qab calibration, nyob rau hauv lub USB 3.2 Gen2 RX xeem tej yam kev mob, xaiv Rx rau calibrate PJ @ 100MHz ib puag ncig. Tom qab dhau los ntawm kev sib tw thiab LRD cable, oscilloscope ntes cov waveform tsib zaug, thiab tom qab ntawd txheeb xyuas nws nrog usb3sigtest software thiab 7 CTLE templates. (usb3 sigtest tsuas muaj ib qho qauv ctle_5db thawj zaug, thiab nws yog qhov tsim nyog los teeb tsa manually thiab ntxiv ctle_0db ~ ctle_6 DB template)

Kev txiav txim ntawm USB 3.2 Gen2 xeem tau, (nruab nrab tus nqi ntawm 5 captures):

LRD cable zoo tshaj qhov muag cheeb tsam ≥ passive cable zoo tshaj plaws qhov muag

Thiab qhov muag dav ntawm LRD cable ≥ 0.9 * passive cable

Cov ntsiab lus

USB hom-C yog dav siv nyob rau hauv cov computers thiab lwm yam peripheral li, nrog rau passive cables thiab active cables. Qee qhov tsuas yog txhawb USB 2.0 thiab them nyiaj, thiab qee qhov tuaj yeem txhawb USB 3.2 thiab USB4; Lawv yog tag nrho cov USB hom-C connectors, uas txhawb kev sib txawv muaj peev xwm thiab ceev, uas yooj yim rau confuse cov neeg siv. Lub koom haum USB tseem tsom rau cov neeg siv kev paub dhau los thiab tau cog lus rau hom-C cable, uas tuaj yeem ua tau raws li txhua daim ntawv thov. Nyob rau hauv lub active cable ib feem, cov specification yuav tsum txhawb ob-txoj kev kis tau tus mob, zoo thiab tsis zoo plug-in, dual channel (x2), thiab lwm yam. Siv lub USB4 LRD active cable ua piv txwv, nws muaj peev xwm txhawb USB4, USB 3.2, USB 2.0. , thunderbolt 3, PD them, thiab lwm yam kom tau raws li USB hom-C daim ntawv thov nrog ib kab.

Qhov sib txawv loj tshaj plaws ntawm USB hom-C active cable thiab passive cable yog seb puas muaj cov khoom siv ua haujlwm, uas tseem ua rau muaj kev sib txawv rau kev ntsuas cov teeb liab sib txawv ntawm kev kub ceev. Cov kab hluav taws xob nquag siv tau siv txoj kev ntsuas siab uas twb muaj lawm ntawm USB4 tus tswv tsev thiab cov cuab yeej siv, thiab siv lub tshuab hluav taws xob ntau zaus thiab oscilloscope siab rau kev sim. Qhov chaw sim thiab cov hau kev yog qhov nyuaj, GRL muab cov kev ntsuas kev ntsuas kev ntsuas rau USB4, uas tuaj yeem txo qhov kev sim nyuaj. GRL muaj kev paub dhau los hauv kev kho EQ, nce thiab lwm yam tsis zoo thiab pab cov neeg siv khoom hauv kev debugging. GRL tseem tuaj yeem muab USB4 tus tswv tsev thiab khoom siv, USB4 passive cable, USB4 nquag cable thiab lwm yam kev kuaj thiab ntawv pov thawj.

Kev siv

USB Hom-C Cable thiab Connector Specification, Tso Tawm 2.1, Tsib Hlis 2021

USB Hom-C Connectors thiab Cable Assemblies CTS, Kho 2.1b, Lub Rau Hli 2021

USB4 ™ Thunderbolt3 ™ Compatibility Requirements Spec, Version 1.0, Lub Ib Hlis 2021.

USB4 ™ Thunderbolt3 ™ Compatibility CTS, Hloov kho 1.0, Lub Ib Hlis 2021.

USB Fais fab xa tuaj CTS, Kho: 1.2, Ver 2, Lub Rau Hli 20, 2021

USB Hom-C Functional Test Specification, Tshooj 4 thiab 5, Tsib Hlis 23, 2021, Rev 0.88