2021年5月份,北汇基于对IOP测试的理解和经验积累,根据OPEN Alliance 1000BASE-T1(Draft)物理层测试规范,采用了基于Vector CANoe、VN5650、VT System和Technica Golden Device组合式的方案,实现了1000BASE-T1 IOP测试。如今,北汇基于Technica公司升级版的Golden Device,推出“一站式”100&1000BASE-T1 IOP测试解决方案。
针对100BASE-T1和1000BASE-T1的IOP测试项,Link-up Time与Signal Quality的测试要求完全相同,其中OABR_CABLE_03:Cable diagnostics for good cable是针对千兆新增测试项。如下将介绍各测试项的实现方案。
▲Link-up Time - Trigger:Power on Link Partner
▲被测控制器上电且唤醒,使用Vector CANoe CAPL编程触发Golden Device的Link-up Time - Trigger:Power on Link Partner测试程序,Golden Device自动记录每次的Link时间并回传给Vector CANoe软件
图1 Link-up Time - Trigger:Power on Link Partner测试接线图
▲Link-up Time - Trigger:Power on DUT
> 使用Vector CANoe CAPL编程触发Golden Device的Link-up Time - Trigger:Power on DUT测试程序,Golden Device自动记录每次的Link时间并回传给Vector CANoe软件
图2 Link-up Time - Trigger:Power on DUT测试接线图
▲Link-up Time - Trigger:Wake-Up DUT
> 被测控制器处于休眠状态,使用CANoe CAPL编程触发Golden Device的Link-up Time - Trigger:Wake-Up DUT测试程序,Golden Device自动记录每次的Link时间并回传给CANoe软件
图3 Link-up Time - Trigger:Wake-Up DUT测试接线图
▲OABR_SIGNAL_01:Indicated signal quality for channel with decreasing quality
▲OABR_SIGNAL_01:Indicated signal quality for channel with decreasing quality
> 将Golden Device的Link Partner与被测控制器PHY端口连接,通过CANoe CAPL编程修改噪声模式(100BASE-T1/1000BASE-T1)和噪声等级,以及发送被测控制器测试指令获取DUT的SQI和Link Status
图4 Signal Quality测试接线图
▲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
> 将Golden Device的故障注入模块串联在Link Partner端口和被测控制器PHY端口之间,通过CANoe CAPL编程实现短路/开路故障自动注入功能,以及发送被测控制器指令获取DUT的Cable Status
图5 OABR_CABLE测试接线图
基于CANoe CAPL编写的IOP自动化测试脚本。支持CAN/CAN FD应用报文、CAN/CAN FD诊断报文、RS232、ADB等方式获取PHY SQI以及线缆状态值的读取。
图6 基于CANoe的操作界面
CANoe软件解析、记录Golden Device回传的结果,并对全部数据结果进行汇总整理方便查看以及问题分析。
图7 测试报告样式
回顾车载以太网IOP的测试方案迭代历程,北汇从推出满足TC8 1.0使用电阻作为干扰噪声的测试方案,到满足TC8 2.0/3.0联合Technica 百兆Golden Device和R&S噪声发生器的测试方案,到如今可同时满足100BASE-T1和1000BASE-T1的“一站式”测试方案,其中的每一次测试方案升级都紧跟测试需求的步伐,在行业同仁、合作伙伴的支持协助下,完成了一次又一次技术升级。
近1年来,汽车人又开始研究10BASE-T1S和MultiGBASE-T1技术的发展前景和应用场景,Open联盟也成立了TC14和TC15小组制定相关的测试标准,在draft版本中体现了对应的测试内容。
▲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
▲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
北汇会陆续推出10BASE-T1S和MultiGBASE-T1的IOP测试解决方案,敬请期待。北汇愿与大家持续进行技术分享,共同进步!
参考文献
[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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