前言
2021年5月份,北匯基于對IOP測試的理解和經(jīng)驗(yàn)積累,根據(jù)OPEN Alliance 1000BASE-T1(Draft)物理層測試規(guī)范,采用了基于Vector CANoe、VN5650、VT System和Technica Golden Device組合式的方案,實(shí)現(xiàn)了1000BASE-T1 IOP測試。如今,北匯基于Technica公司升級版的Golden Device,推出“一站式”100&1000BASE-T1 IOP測試解決方案。
測試方案簡介
針對100BASE-T1和1000BASE-T1的IOP測試項(xiàng),Link-up Time與Signal Quality的測試要求完全相同,其中OABR_CABLE_03:Cable diagnostics for good cable是針對千兆新增測試項(xiàng)。如下將介紹各測試項(xiàng)的實(shí)現(xiàn)方案。
Link-up Time
▲Link-up Time - Trigger:Power on Link Partner
▲被測控制器上電且喚醒,使用Vector CANoe CAPL編程觸發(fā)Golden Device的Link-up Time - Trigger:Power on Link Partner測試程序,Golden Device自動記錄每次的Link時間并回傳給Vector CANoe軟件
圖1 Link-up Time - Trigger:Power on Link Partner測試接線圖
▲Link-up Time - Trigger:Power on DUT
>使用Vector CANoe CAPL編程觸發(fā)Golden Device的Link-up Time - Trigger:Power on DUT測試程序,Golden Device自動記錄每次的Link時間并回傳給Vector CANoe軟件
圖2 Link-up Time - Trigger:Power on DUT測試接線圖
▲Link-up Time - Trigger:Wake-Up DUT
>被測控制器處于休眠狀態(tài),使用CANoe CAPL編程觸發(fā)Golden Device的Link-up Time - Trigger:Wake-Up DUT測試程序,Golden Device自動記錄每次的Link時間并回傳給CANoe軟件
圖3 Link-up Time - Trigger:Wake-Up DUT測試接線圖
Signal Quality
▲OABR_SIGNAL_01:Indicated signal quality for channel with decreasing quality
▲OABR_SIGNAL_01:Indicated signal quality for channel with decreasing quality
>將Golden Device的Link Partner與被測控制器PHY端口連接,通過CANoe CAPL編程修改噪聲模式(100BASE-T1/1000BASE-T1)和噪聲等級,以及發(fā)送被測控制器測試指令獲取DUT的SQI和Link Status
圖4 Signal Quality測試接線圖
Cable Diagnostic
▲OABR_CABLE_01:Cable diagnostics for near and far end short
▲OABR_CABLE_02:Cable diagnostics for near and far end open
▲OABR_CABLE_03:Cable diagnostics for good cable
>將Golden Device的故障注入模塊串聯(lián)在Link Partner端口和被測控制器PHY端口之間,通過CANoe CAPL編程實(shí)現(xiàn)短路/開路故障自動注入功能,以及發(fā)送被測控制器指令獲取DUT的Cable Status
圖5 OABR_CABLE測試接線圖
測試案例簡介
測試工程
基于CANoe CAPL編寫的IOP自動化測試腳本。支持CAN/CAN FD應(yīng)用報(bào)文、CAN/CAN FD診斷報(bào)文、RS232、ADB等方式獲取PHY SQI以及線纜狀態(tài)值的讀取。
圖6基于CANoe的操作界面
測試報(bào)告
CANoe軟件解析、記錄Golden Device回傳的結(jié)果,并對全部數(shù)據(jù)結(jié)果進(jìn)行匯總整理方便查看以及問題分析。
圖7測試報(bào)告樣式
總結(jié)
測試方案對比
回顧車載以太網(wǎng)IOP的測試方案迭代歷程,北匯從推出滿足TC8 1.0使用電阻作為干擾噪聲的測試方案,到滿足TC8 2.0/3.0聯(lián)合Technica百兆Golden Device和R&S噪聲發(fā)生器的測試方案,到如今可同時滿足100BASE-T1和1000BASE-T1的“一站式”測試方案,其中的每一次測試方案升級都緊跟測試需求的步伐,在行業(yè)同仁、合作伙伴的支持協(xié)助下,完成了一次又一次技術(shù)升級。
近1年來,汽車人又開始研究10BASE-T1S和MultiGBASE-T1技術(shù)的發(fā)展前景和應(yīng)用場景,Open聯(lián)盟也成立了TC14和TC15小組制定相關(guān)的測試標(biāo)準(zhǔn),在draft版本中體現(xiàn)了對應(yīng)的測試內(nèi)容。
TC14(10BASE-T1S)典型測試條目如下:
▲proper communication of transmission cycles under different stress conditions
▲PLCA robustness for stressing of clock synchronization and PLCA state machine
▲PLCA diagnostic
▲Signal Quality
▲Harness Defect Detection
▲Topology Discovery
▲Wake-up Sleep
TC15(MultiGBASE-T1)典型測試條目如下:
▲Reliability of indicated link status directly after link-up / PHY reset
▲Reliability of indicated link status when connected to link partner with same MASTER/SLAVE configuration
▲Revoke of link status after link-down
▲Link-up after PHY-reset
▲Link-up after reset of link partner
▲Indicated signal quality for channel with decreasing quality
▲Indicated signal quality for channel with increasing quality
▲Cable diagnostics for error-free channel
▲Cable diagnostics for near and far end open
▲Cable diagnostics for near and far end short
北匯會陸續(xù)推出10BASE-T1S和MultiGBASE-T1的IOP測試解決方案,敬請期待。北匯愿與大家持續(xù)進(jìn)行技術(shù)分享,共同進(jìn)步!
參考文獻(xiàn)
[1] IEEE Standard for Ethernet:Amendment 1: Physical Layer Specifications and Management Parameters for 100 Mb/s Operation over a Single Balanced Twisted Pair Cable(100BASE-T1)
[2] IEEE Standard for Ethernet:Amendment 4: Physical Layer Specifications and Management Parameters for 1 Gb/s Operation over a Single Twisted-Pair Copper Cable
[3] OPEN Alliance Automotive Ethernet ECU Test Specification_TC8 V1.0
[4] OPEN Alliance Automotive Ethernet ECU Test Specification_TC8 V2.0
[5] OPEN Alliance Automotive Ethernet ECU Test Specification_TC8 V3.0
[6] OA_100BASE-T1_Interoperability_Test_Suite_V1.0
[7] OA_1000BASE-T1_Interoperability_Test_Suite_V1.1
[8] MultiGBASE-T1 Interoperability Test Suite_V0.2
[9] 10BASE-T1S Half-Duplex Multidrop Interoperability Test Suite_V0.2
[10] Golden Device User Manual
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