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DC25_SLIDES_Track12_MethodologyAccuratePCIeReceiverTesting_Stangel_V3.pdf

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1、Information Classification:GeneralWelcome to ConferenceJanuary 2830,2025Santa Clara Convention Center1ExpoJanuary 2930,2025 Information Classification:GeneralMethodology for Accurate Receiver Testing in PCIe using Measured Step Response based Stressed Eye CalibrationKarsten Stangel(Intel Corporation

2、)Dean Gonzales,Ethan Crain,Gurpreet Narula,Abdul Rehman(AMD)Ricardo Baca,Christiaan Bil,Patrick Kennedy,Manjari Kulkarni,Manisha Nilange,Mohiuddin Mazumder,Kyle Sheahan(Intel Corporation)2Information Classification:GeneralImageSPEAKERSKarsten StangelAnalog Platform Architect,Intel CKarsten is an ana

3、log platform architect at Intels Data Center&AI group.He received his diploma in electrical engineering from the University of Duisburg,Germany,in 1999.His current focus covers pathfinding and feasibility of next generation High-Speed IO technologies,development of standards,specifications,and valid

4、ation methodologies.3Information Classification:General High level Overview of PCIe Receiver Jitter Tolerance Validation Measured Step Response based Rx Stressed Eye Calibration Methodology Calibration Channel Reflections of various Topologies and their impact on Stressed Eye Analysis of measured St

5、ep Response Quality and possible Improvements Instrument to Instrument Variability of Step Response Quality and Averaging Conclusion and SummaryAgenda4Information Classification:General Jitter tolerance test is the corner stone validation item in PCIeto ensure Rx specification compliance and robustn

6、ess BERT sends and receives compliance pattern to DUT Calibration channel with maximum loss as per spec(e.g.PCIe 6.0 32dB)Impairments are applied to provide a stressed eye to DUT RxPCIe Receiver Jitter Tolerance(Jtol)Validation5 Jitter Tolerance Mask with pass/fail regionJtol curve describes Receive

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1. **PCIe接收器抖动容限(Jtol)测试**:是确保接收器规范合规性和鲁棒性的关键验证,需通过校准的应力眼(如PCIe 6.0眼高6.0mV、眼宽0.1 UI)进行测试。 2. **基于实测阶跃响应的校准方法**:BERT通过校准通道生成阶跃响应,示波器捕获波形后通过统计模拟器处理,以确定应力配方并应用于DUT。 3. **通道反射的影响**:反射需通过截断阶跃响应(如PCIe 5.0中截断至960 UI)或优化CTLE来减少眼高/眼宽 degradation,低反射通道可能因残余高频纹波被误判为ISI。 4. **仪器与噪声优化**:仪器间存在显著差异,需通过高倍数平均(如10240x)和减小示波器垂直刻度来降低残余噪声,确保眼边距准确评估。 5. **结论**:高质量阶跃响应是准确应力眼校准的前提,需谨慎验证接收器通过/失败结果,并开发工具量化阶跃响应质量。
**PCIe眼图校准秘诀?** **反射如何影响测试?** **如何减少噪声干扰?**
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