Kwiintsuku ezimbalwa ezidlulileyo iindaba zabhengezwa ukuba Facebook ipapashe uphuhliso ezinxulumene Ukudalwa kwe ibhodi yePCIe, ebandakanyauzalisekisa iwotshi yeathom encinci kunye ne-GNSS receiver.
Ibhodi yayiyilwe ekuqaleni njengesixhobo semodyuli, evumela ukusetyenziswa kweentlobo ezahlukeneyo ze-atomic clock chips ezithengiswayo kunye neemodyuli ze-GNSS, ezifana ne-SA5X, mRO-50, SA.45s kunye ne-u-blox RCB-F9T. U-Orolia uzimisele ukuqalisa ukuveliswa kweebhodi ezigqityiweyo ngokweenkcukacha ezilungiselelwe.
Ikhadi lexesha iphuhliswa njengenxalenye yeprojekthi yesixhobo sexesha lehlabathi ejoliswe ukubonelela ngamacandelo ekudaleni iiseva zexesha eliphambili (I-Time Master) (Iseva yeXesha eliVulekileyo) enokuthi ifakwe kwisiseko sakho kwaye isetyenziswe, umzekelo, ukulungelelanisa ixesha lokuvumelanisa kumaziko edatha.
Ukusetyenziswa komncedisi ozimeleyo kukuvumela ukuba ungaxhomekeki kwiinkonzo zenethiwekhi zangaphandle ukulungelelanisa ixesha elichanekileyo, kunye nobukho bewotshi yeathom eyakhelweyo inikeza umgangatho ophezulu wokuzimela kwimeko yokusilela ekufumaneni idatha kwiinkqubo zesathelayithi (umzekelo ngenxa yeemeko zemozulu okanye ukuhlaselwa).
Uyilo olutsha lwexesha le-NTP olusekelwe kwi-NTP lisebenzisa i-Stratum 1, icandelo eliphambili elidityaniswe ngokuthe ngqo kumthombo wexesha eligunyazisiweyo, njengenkqubo yesathelayithi yokuzulazula yehlabathi (GNSS) okanye iwotshi ye-cesium.
Into ekhethekileyo yeprojekthi kukuba ukwakha iseva yexesha lokuqala, ungasebenzisa umncedisi oqhelekileyo esekwe kuyilo lwex86, ebandakanya ikhadi lenethiwekhi eqhelekileyo kunye nekhadi lexesha.
Kwiseva ethe, ulwazi malunga nexesha elichanekileyo elifunyenwe kwiisathelayithi nge-GNSS kwaye iwotshi ye-athomu isebenza njenge-oscillator ezinzile kakhulu, ivumela izinga eliphezulu lokuchaneka ukuba ligcinwe kwimeko apho akukho lwazi lufunyenwe nge-GNSS. Ukutenxa okunokwenzeka ukusuka kwixesha elichanekileyo kwimeko yokungenakwenzeka kokufumana idatha nge-GNSS kwibhodi ecetywayo kuqikelelwa malunga nama-nanoseconds angama-300 ngosuku.
Umqhubi we-oCP_pt ilungiselelwe iLinux y Kucetywa ukuba kufakwe kwi-Linux 5.15 kernel ephambili.
Umlawuli isebenzisa PTP POSIX ujongano (/dev/ptp2), GNSS nge serial port /dev/ttyS7, iwotshi yeathom nge serial port /dev/ttyS8 kunye nezixhobo ezimbini ze-i2c /dev/i2c- *, apho amandla ewotshi ye-hardware (PHC) inokufikelela kwindawo yomsebenzisi.
Xa uqalisa iseva ye-NTP (iProtokholi yeXesha leNethiwekhi), kucetyiswa ukuba kusetyenziswe iChrony kunye ne-NTPd, kwaye xa uqalisa iseva ye-PTP (Precision Time Protocol), kucetyiswa ukuba kusetyenziswe i-ptp4u okanye i-ptp4l ngokudibanisa ne-phc2sys stack ebonelela ngekopi yamaxabiso exesha. ukusuka kwiwotshi yeathom ukuya kwikhadi lenethiwekhi.
Ulungelelaniso yokusebenza komamkeli weGNSS kunye newotshi yeathom Inokwenziwa kuzo zombini iihardware kunye nesoftware. Ukusebenza kwe-hardware yemodyuli yokudibanisa kuphunyezwa ngesiseko se-FPGA, kwaye i-software version isebenza kwinqanaba lokujonga ngokuthe ngqo imeko yomamkeli we-GNSS kunye newashi ye-athomu evela kwizicelo ezifana ne-ptp4l kunye ne-chronyd.
Isizathu sokuphuhliswa kwebhodi evulekileyo endaweni yokusebenzisa izisombululo esele zilungisiwe ezikhoyo kwimarike, yinto yobunikazi beemveliso ezinjalo, ezingasivumeli ukuba siqinisekise ukuba ukuphunyezwa ngokuchanekileyo, isofthiwe ecetywayo ayihambelani nokhuseleko. iimfuno. (Kwiimeko ezininzi, iinkqubo eziphelelwe lixesha zibonelelwa kwaye ukuhanjiswa kokulungiswa komngcipheko kunokuthatha iinyanga okanye iminyaka), kunye nobuchule obulinganiselweyo bobumbeko kunye nokubeka iliso (i-SNMP) (i-CLI eyakhe okanye ujongano lomsebenzisi wewebhu luyanikezelwa) .
Ibhodi ingasetyenziselwa ukulungelelanisa umsebenzi weeseva zolungelelwaniso lwexesha elahlukileyo. Inkcazo, i-schematics, i-BOM, i-Gerber, i-PCB kunye neefayile ze-CAD ezifunekayo ukwenza ibhodi ziposwe kwiGitHub.
Umthombo: https://engineering.fb.com
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