I-MICROCHIP PTP Calibration Configuration Guide

Isingeniso

Lo mhlahlandlela wokumisa uhlinzeka ngolwazi lokuthi kwenziwa kanjani ukulinganisa kwe-Port-to-port kanye ne-1PPS ukuthuthukisa isikhathi ngokulungisa ukubambezeleka kokungena/ukuphuma.

Incazelo Yesici

Ukuphikelela Kwemiphumela Yokulinganisa
Imiphumela evela ekwenzeni ukulinganisa okuchazwe ngezansi ilondolozwa ku-flash ukuze iqhubeke ngisho noma idivayisi ijikeleziswa ngamandla noma iqaliswe kabusha.

Ukuphikelela ekulayisheni kabusha okuzenzakalelayo

Imiphumela evela ekwenzeni ukulinganisa okuchazwe ngezansi iyaqhubeka nakuzo zonke ezizenzakalelayo zokulayisha kabusha. Uma okuzenzakalelayo kokulayisha kabusha kuzosetha kabusha ukulinganisa kokumisiwe okwakhelwe ngaphakathi, lokhu kufanele kucaciswe njengepharamitha yokulayisha kabusha okuzenzakalelayo okungukuthi:

Ukulungiswa Okuzenzakalelayo kwe-Timestamp Ireferensi Yendiza

I-CLI ifaka umyalo okala umehluko we-T2-T1 wembobo ye-PTP kumodi ye-loopback bese ilungisa ngokuzenzakalelayo ukulibaziseka kokuphuma nokungena kwembobo ukuze i-T2 ne-T1 zilingane. Ukulinganisa okwenziwa yilo myalo okwemodi kuphela lapho imbobo empeleni ilungiselelwe ukusebenza. Ukwenza ukulinganisa kwawo wonke amamodi asekelwa imbobo, umyalo kuzodingeka uphindwe kumodi ngayinye.

I-syntax yomyalo ithi:

Inketho ethi 'ext' icacisa ukuthi i-loopback yangaphandle iyasetshenziswa. Uma inketho ye-'int' isetshenziswa, imbobo izolungiselelwa i-loopback yangaphakathi.
Qaphela: Kumasistimu anokwehluka okukhulu kwe-linkup-to-linkup latency (indawo enganxeshezelwanga ye-serial-to-parallel barrel shifter) ukulinganisa kwehlisa isixhumanisi izikhathi eziningi ukuze kuqinisekiswe ukuthi ukulinganisa kwenziwa kunani eliphakathi (hhayi inani elisho ukuthi) .

Ukulinganisa kwembobo kuya ethekwini
I-CLI ifaka umyalo wokulinganisa imbobo ye-PTP ngokuphathelene nenye imbobo ye-PTP (imbobo yereferensi) yeswishi efanayo. Ukulinganisa okwenziwa yilo myalo okwemodi kuphela lapho imbobo empeleni ilungiselelwe ukusebenza. Ukwenza ukulinganisa kwawo wonke amamodi asekelwa imbobo, umyalo kuzodingeka uphindwe kumodi ngayinye.

I-syntax yomyalo ithi:

Isenzakalo sesigqila se-PTP esihlobene nembobo elinganiswayo kufanele isebenze ngemodi yokuhlola ukuze kungabikho ukulungiswa okwenziwayo kusikhathi se-PTP. Inqubo yokulinganisa izokala umehluko we-T2-T1 ne-T4-T3 futhi ngokucabangela nokubambezeleka kwekhebula kwenza izinguquko ezilandelayo:

1. Lungisa ukubambezeleka kokungena kwembobo nge-T2-T1-cable_latency
2. Lungisa ukubambezeleka kokuphuma kwembobo nge-T4-T3-cable_latency

Qaphela: Kumasistimu anokwehluka okukhulu kwe-linkup-to-linkup latency (indawo enganxeshezelwanga ye-serial-to-parallel barrel shifter) ukulinganisa kwehlisa isixhumanisi izikhathi eziningi ukuze kuqinisekiswe ukuthi ukulinganisa kwenziwa kunani eliphakathi (akusho inani).

Ukulinganisa kuNkomba Yangaphandle kusetshenziswa i-1PPS

I-CLI ifaka umyalo wokulinganisa imbobo ye-PTP ngokuphathelene nereferensi yangaphandle ngesignali ye-1PPS. Ukulinganisa okwenziwa yilo myalo okwemodi kuphela lapho imbobo empeleni ilungiselelwe ukusebenza. Ukwenza ukulinganisa kwawo wonke amamodi asekelwa imbobo, umyalo kuzodingeka uphindwe kumodi ngayinye.
I-syntax yomyalo ithi:

Inketho yokuvumelanisa yenza imbobo engaphansi kokulinganisa ikhiye imvamisa yewashi layo kusithenjwa isebenzisa i-SyncE. Njengengxenye yenqubo yokulinganisa, isibonelo sesigqila se-PTP esihlobene nembobo engaphansi kokulinganisa sizokhiya isigaba saso kusithenjwa. Uma isigqila se-PTP sesikhiywe ngokugcwele futhi sizinzile, ukulinganisa kuzokala ukulibaziseka kwendlela bese kwenze izinguquko ezilandelayo:

1. Ukubambezeleka kokungena = Ukubambezeleka kokungena + (MeanPathDelay – cable_latency)/2
2. Ukubambezeleka kokuphuma = Ukubambezeleka kokuphuma + (MeanPathDelay – cable_latency)/2

Qaphela: Ukulandela ukulinganisa okuyimpumelelo, ukubambezeleka kwendlela emaphakathi kuzolingana nokubambezeleka kwekhebula.
Qaphela: Kumasistimu anokwehluka okukhulu kwe-linkup-to-linkup latency (indawo enganxeshezelwanga ye-serial-to-parallel barrel shifter) ukulinganisa kwehlisa isixhumanisi izikhathi eziningi ukuze kuqinisekiswe ukuthi ukulinganisa kwenziwa kunani eliphakathi (akusho inani).

Ukulinganiswa kwe-1PPS skew
Umyalo 'we-ptp cal port' (ngenhla) ulinganisa imbobo ye-PTP ibe yireferensi yangaphandle isebenzisa i-1PPS. Lokhu kulinganisa akunaki ukulibaziseka kokukhishwayo kwesignali ye-1PPS yembobo engaphansi kokulinganisa. Ukuze wenze okukhiphayo kwe-1PPS kwedivayisi ngaphansi kokulinganisa kuhambisane ne-1PPS yesithenjwa, ukulinganisa kudinga ukunxeshezelwa nge-1PPS skew. I-CLI inomyalo wokulungisa ukulinganiswa kwembobo ye-1PPS yokuphuma kwe-skew. Ukulinganisa okwenziwa yilo myalo okwemodi kuphela lapho imbobo empeleni ilungiselelwe ukusebenza. Ukwenza ukulinganisa kwawo wonke amamodi asekelwa imbobo, umyalo kuzodingeka uphindwe kumodi ngayinye.
I-syntax yomyalo ithi:

• i-ptp cal port offset

Qaphela: Kumasistimu anokwehluka okukhulu kwe-linkup-to-linkup latency (indawo enganxeshezelwanga ye-serial-to-parallel barrel shifter) ukulinganisa kwehlisa isixhumanisi izikhathi eziningi ukuze kuqinisekiswe ukuthi ukulinganisa kwenziwa kunani eliphakathi (akusho inani).

1PPS Ukulinganisa Okokufaka

I-CLI ifaka umyalo wokulungisa ukulinganiswa kwembobo ngokubambezeleka okokufaka kwe-1PPS.
I-syntax yomyalo ithi: 

• ptp 1pps

Ngaphambi kokukhipha umyalo, okukhiphayo kwe-1PPS kufanele kuxhunywe kokokufaka kwe-1PPS kusetshenziswa intambo enokulibaziseka okwaziwayo. Ikhebuli izoba mfishane ngangokunokwenzeka. Umyalo uzovumela ukuphuma kwe-1PPS kanye ne-samplesikhathi se-LTC kokokufaka kwe-1PPS. I-sampIsikhathi se-LTC esiholayo sibonisa ukubambezeleka kubhalwa ngale ndlela elandelayo: Ukubambezeleka kwebhafa ye-1PPS + ukubambezeleka kokufaka okungu-1PPS + Ukubambezeleka kwebhafa yekhebula Ukulibaziseka kwebhafa ye-1PPS ngokuvamile kuba kububanzi obungu-1 ns. Ukubambezeleka kokufaka kwe-1PPS kufanele kubalwe futhi kulondolozelwe ukusetshenziswa kamuva lapho i-PTP isebenzisa okokufaka kwe-1PPS.

Ukuphela Kwedokhumenti.

Amadokhumenti / Izinsiza

I-MICROCHIP PTP Calibration Configuration Guide [pdf] Umhlahlandlela Womsebenzisi I-PTP Calibration Configuration Guide

Izithenjwa

• Imaniwali yosebenzisayo