Isikhokelo soLungiselelo lwe-MICROCHIP PTP
Intshayelelo
Esi sikhokelo soqwalaselo sibonelela ngolwazi malunga nendlela yokwenza iPort-to-port kunye ne-1PPS ulungelelwaniso lokuphucula ixesha ngokulungelelanisa ukungena / ukuphuma kwe-latencies.
Inkcazelo yoMba
Ukuzingisa kweZiphumo zoLungiso
Iziphumo zokwenziwa kolungelelwaniso oluchazwe ngezantsi zigcinwa kwi-flash ukuze ziqhubeke nokuba isixhobo sijikeleziswa ngamandla okanye siqaliswe ngokutsha.
Ukuzingisa ukulayisha kwakhona-okungagqibekanga
Iziphumo ezisuka ekwenziweni kolungelelwaniso oluchazwe ngezantsi ziyazingisa nakokukhutshelwa kwakhona-okungagqibekanga. Ukuba ukulayishwa kwakhona-okungagqibekanga kuyakuseta kwakhona ulungelelwaniso kulwenzeko olwakhelwe-ngaphakathi, oku kufuneka kucaciswe njengeparameter ukuphinda kulayishe-okungagqibekanga okt.
Uhlengahlengiso oluzenzekelayo lweTimestamp Isalathiso seNqwelo-moya
I-CLI ibonisa umyalelo olinganisa umahluko T2-T1 yezibuko le-PTP kwimowudi ye-loopback kwaye emva koko ilungelelanise ngokuzenzekelayo ukuphuma nokungena kwe-latencies ye-port ukuze i-T2 kunye ne-T1 zilingane. Ulinganiso olwenziwayo ngulo myalelo lwendlela kuphela apho izibuko liqwalaselwe ukuba lisebenze. Ukwenza ulungelelwaniso kuzo zonke iindlela ezixhaswa lizibuko, umyalelo uya kufuneka uphindwe kwimowudi nganye.
Isivakalisi somyalelo sithi:
Ukhetho 'ext' luxela ukuba i-loop yangaphandle iyasetyenziswa. Xa ukhetho 'int' lusetyenzisiwe, izibuko liza kuqwalaselwe umva wangaphakathi.
Qaphela: Kwiinkqubo ezinonxulumano olukhulu lwe-latency variation (indawo engahlawulwanga ye-serial-to-parallel barrel shifter) ulungelelwaniso luthatha ikhonkco kumaxesha amaninzi ukuqinisekisa ukuba ulungelelwaniso lwenziwa kwixabiso eliphakathi (akuthethi ixabiso) .
Port-to-port ulungelelwaniso
I CLI iveza umyalelo wokulinganisa izibuko le PTP ngembeko kwelinye izibuko le PTP (izibuko lereferensi) lokutshintsha okufanayo. Ulinganiso olwenziwa ngulo myalelo lwendlela kuphela apho izibuko liqwalaselwe ukuba lisebenze. Ukwenza ulungelelwaniso kuzo zonke iindlela ezixhaswa lizibuko, umyalelo uya kufuneka uphindwe kwimowudi nganye.
Isivakalisi somyalelo sithi:
Umzekelo wekhoboka le-PTP elinxulunyaniswa nezibuko elilungelelaniswayo kufuneka lisebenze kwimowudi yokuhlola ukuze kungabikho luhlenga-hlengiso lwenziwayo kwixesha le-PTP. Inkqubo yokulinganisa iya kulinganisa umahluko we-T2-T1 kunye ne-T4-T3 kwaye ngokuqwalasela kwakhona i-cable latency yenza olu hlengahlengiso lulandelayo:
- Lungisa ukubambezeleka kokungena kwizibuko nge-T2-T1-cable_latency
- Lungisa i-egress latency ye-port ene-T4-T3-cable_latency
Phawula: Kwiinkqubo ezinotshintsho olukhulu lwe-linkup-to-linkup latency (engahlawulwanga i-serial-to-parallel barrel shifter position) ulungelelwaniso luthatha ikhonkco amaxesha amaninzi ukuqinisekisa ukuba ukulinganisa kwenziwa kwixabiso eliphakathi (akuthethi ixabiso).
Ulungelelwaniso lweReference yaNgaphandle usebenzisa i-1PPS
I-CLI inomyalelo wokulinganisa izibuko le-PTP ngokubhekiselele kwireferensi yangaphandle ngophawu lwe-1PPS. Ulinganiso olwenziwayo ngulo myalelo lwendlela kuphela apho izibuko liqwalaselwe ukuba lisebenze. Ukwenza ulungelelwaniso kuzo zonke iindlela ezixhaswa lizibuko, umyalelo uya kufuneka uphindwe kwimowudi nganye.
Isivakalisi somyalelo sithi:
Inketho yongqamaniso yenza izibuko ephantsi kolungelelwaniso itshixe amaza ewotshi yayo kwireferensi usebenzisa iSyncE. Njengenxalenye yenkqubo yolungelelwaniso, umzekelo wamakhoboka e-PTP anxulunyaniswa nezibuko eliphantsi kolungelelwaniso liya kusitshixa isigaba salo kwireferensi. Nje ukuba ikhoboka le-PTP litshixiwe ngokupheleleyo kwaye lizinziswe, ulungelelwaniso luya kulinganisa ukulibaziseka kwendlela kwaye lenze olu hlengahlengiso lulandelayo:
- I-Ingress latency = Ingress latency + (MeanPathDelay - cable_latency)/2
- I-Egress latency = I-Egress latency + (MeanPathDelay - cable_latency)/2
Phawula: Ukulandela ulungelelwaniso oluyimpumelelo, ukulibaziseka kwendlela ephakathi kuya kulingana nokubambezeleka kwentambo.
Phawula: Kwiinkqubo ezinotshintsho olukhulu lwe-linkup-to-linkup latency (engahlawulwanga i-serial-to-parallel barrel shifter position) ulungelelwaniso luthatha ikhonkco amaxesha amaninzi ukuqinisekisa ukuba ukulinganisa kwenziwa kwixabiso eliphakathi (akuthethi ixabiso).
Ulungelelwaniso lwe-1PPS skew
Umyalelo 'weptp cal port' (ngasentla) ulinganisa izibuko le PTP kwireferensi yangaphandle usebenzisa i-1PPS. Olu lungelelwaniso aluthatheli ngqalelo ukulibaziseka kwemveliso ye-1PPS yesiginali yezibuko phantsi kolungelelwaniso. Ukuze wenze imveliso ye-1PPS yesixhobo phantsi kokulungelelaniswa ihambelana ne-1PPS yesalathiso, ukulinganisa kufuneka kuhlawulelwe i-1PPS skew. I-CLI inomyalelo wokulungelelanisa i-port calibration ye-1PPS output skew. Ulinganiso olwenziwayo ngulo myalelo lwendlela kuphela apho izibuko liqwalaselwe ukuba lisebenze. Ukwenza ulungelelwaniso kuzo zonke iindlela ezixhaswa lizibuko, umyalelo uya kufuneka uphindwe kwimowudi nganye.
Isivakalisi somyalelo sithi:
- pp cal port i-offset
Phawula: Kwiinkqubo ezinotshintsho olukhulu lwe-linkup-to-linkup latency (engahlawulwanga i-serial-to-parallel barrel shifter position) ulungelelwaniso luthatha ikhonkco amaxesha amaninzi ukuqinisekisa ukuba ukulinganisa kwenziwa kwixabiso eliphakathi (akuthethi ixabiso).
Ulungelelwaniso loNgeniso lwe-1PPS
I-CLI inomyalelo wokulungelelanisa ulungelelwaniso lwezibuko lokulibaziseka kwegalelo le-1PPS.
Isivakalisi somyalelo sithi:
- ppt cal 1pps
Ngaphambi kokukhupha umyalelo, imveliso ye-1PPS kufuneka iqhagamshelwe kwigalelo le-1PPS usebenzisa intambo kunye nokulibaziseka okwaziwayo. Intambo iya kuba mfutshane kangangoko. Umyalelo uya kwenza imveliso ye-1PPS kunye ne-sample LTC ixesha kwigalelo 1PPS. I-sampixesha le-LTC elikhokelwayo libonisa ukulibaziseka kuqulunqwe ngolu hlobo lulandelayo: Ukulibaziseka kwe-1PPS ye-buffer ye-output + 1PPS yokulibaziseka kokufakwayo + I-Cable latency Ukulibaziseka kwe-buffer ye-1PPS yemveliso ngokuqhelekileyo kuluhlu lwe-1 ns. Ukulibaziseka kwegalelo le-1PPS kufuneka kubalwe kwaye kugcinwe ukuze kusetyenziswe kamva xa i-PTP isebenzisa igalelo le-1PPS.
Isiphelo soxwebhu.
Amaxwebhu / Izibonelelo
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Isikhokelo soLungiselelo lwe-MICROCHIP PTP [pdf] Isikhokelo somsebenzisi Isikhokelo soLungiselelo lwePTP |
