Omega test report

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    27-Dec-2014

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This document should be very interesting to an engineer because it reports a not biased experimental validation of a predictive tool carried out by a customer for an actual multiboard avionics design. The general considerations are reported at the beginning of the document...the conclusion is that a tool like PRESTO can save up to a 30% in the development time of a system like this . I have other papers reporting validations but these refers to specific non production test vehicules. Then if you give a quick look to the rest of the doc you will have an idea of what is the level of compliance between measurements and predictions...some results are very close together and other shows differences up to 70% or so...but we as engineers we have always to consider the min-max spread of technical specs for digital components may be in order of 100% or more of typical value so it is a nonsense trying to achieve better compliance. Moreover the digital test patterns involved are not the actual ones , and this can make a significant difference, even if Presto was provided with a feature allowing the user to put in the model actual test patterns as input stimuli. Presto was a state-of-the art post -layout tool at this time and this thanks to both the simulation engine (SPRINT, the predecessor of DWS) and to the modeling techniques including PD planes. Extracted nets of up to hundreds of thousands of lines (circuital elements) were simulated in some tens of minutes on machines that were 1000 times slower than today PCs. A true CO-SIMULATION of SI , PI and EMC was performed...no other commercial tool was able to achieve this performance level. This can give you an idea of the capabilties of both DWS and related modeling methods like BTM ...the PI/SI examples I'm building up for Spicy SWAN are only a very small subset of the complexity Presto was able to deal with.

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  • 1. OMEGA PROJECT : Validation test report TEST REPORT (OMEGA PROJECT) project n 28599 ref.: XXXXX 1 /398 Issue 1 Ce document est la proprit dAEROSPATIALE. Il ne peut tre communiqu des tiers et/ou reproduit sans autorisation crite pralable dAEROSPATIALE. This document is the property of AEROSPATIALE. It cannot be disclosed and/or reproduced without AEROSPATIALE written approval. XXX
  • 2. OMEGA PROJECT : Validation test report Reference : / 99 Date : Issue : 01 Written by : EMC group Visa : Approved by : Ph. BOITEUX Visa : REVIEW CONTENTS ref.: XXXXX 2 /398 Issue 1 Ce document est la proprit dAEROSPATIALE. Il ne peut tre communiqu des tiers et/ou reproduit sans autorisation crite pralable dAEROSPATIALE. This document is the property of AEROSPATIALE. It cannot be disclosed and/or reproduced without AEROSPATIALE written approval. XXX
  • 3. OMEGA PROJECT : Validation test report Edition Date Description 01 XXXXX New document File ref.: XXXXX Modifications 3 /398 Issue 1 Ce document est la proprit dAEROSPATIALE. Il ne peut tre communiqu des tiers et/ou reproduit sans autorisation crite pralable dAEROSPATIALE. This document is the property of AEROSPATIALE. It cannot be disclosed and/or reproduced without AEROSPATIALE written approval. XXX
  • 4. OMEGA PROJECT : Validation test report ref.: XXXXX 4 /398 Issue 1 Ce document est la proprit dAEROSPATIALE. Il ne peut tre communiqu des tiers et/ou reproduit sans autorisation crite pralable dAEROSPATIALE. This document is the property of AEROSPATIALE. It cannot be disclosed and/or reproduced without AEROSPATIALE written approval. XXX
  • 5. OMEGA PROJECT : Validation test report REFERENCES DOCUMENTS Reference ref.: XXXXX Title Origin 5 /398 Issue 1 Ce document est la proprit dAEROSPATIALE. Il ne peut tre communiqu des tiers et/ou reproduit sans autorisation crite pralable dAEROSPATIALE. This document is the property of AEROSPATIALE. It cannot be disclosed and/or reproduced without AEROSPATIALE written approval. XXX
  • 6. OMEGA PROJECT : Validation test report ref.: XXXXX 6 /398 Issue 1 Ce document est la proprit dAEROSPATIALE. Il ne peut tre communiqu des tiers et/ou reproduit sans autorisation crite pralable dAEROSPATIALE. This document is the property of AEROSPATIALE. It cannot be disclosed and/or reproduced without AEROSPATIALE written approval. XXX
  • 7. OMEGA PROJECT : Validation test report CONTENTS 1. PURPOSE ........................................................................................................................................ 11 2. RECALL OF THE VALIDATION OBJECTIVES ....................................................................................... 12 3. RECALL OF THE USER'S REQUIREMENTS TO BE VALIDATED ............................................................ 13 4. VALIDATION PROCESS .................................................................................................................... 14 4.1 TESTING EQUIPMENTS .................................................................................................................. 14 4.2 VALIDATION ON A STAND ALONE CPU CARD...................................................................................... 14 4.2.1 Aims to be achieved .......................................................................................................... 14 4.2.2 Test points ........................................................................................................................ 14 4.2.3 Synthesis of Results acquired with a normally routed CPU board ...................................... 16 4.2.4 Synthesis of Results acquired with a willingly degraded CPU board (TBC) ......................... 33 4.2.5 Conclusion ........................................................................................................................ 33 4.3 VALIDATION ON A MULTIBOARD SYSTEM........................................................................................... 35 4.3.1 Aims to be achieved .......................................................................................................... 35 4.3.2 Simulation configurations .............................................. Errore. Il segnalibro non definito. 4.3.3 Net tested ......................................................................................................................... 35 4.3.4 Synthesis of Results acquired with a normally backplane .................................................. 37 4.3.5 Synthesis of Results acquired with a degraded backplane ................................................. 46 4.3.6 Optimisation of the design ................................................................................................ 48 4.3.7 Conclusion ........................................................................................................................ 50 4.4 SIMULATION OF THE RADIATED EMISSION OF A BREADBOARD ............................................................... 52 4.4.1 Aims to be achieved .......................................................................................................... 52 ref.: XXXXX 7 /398 Issue 1 Ce document est la proprit dAEROSPATIALE. Il ne peut tre communiqu des tiers et/ou reproduit sans autorisation crite pralable dAEROSPATIALE. This document is the property of AEROSPATIALE. It cannot be disclosed and/or reproduced without AEROSPATIALE written approval. XXX
  • 8. OMEGA PROJECT : Validation test report 4.4.2 Functional configurations ................................................................................................. 52 4.4.3 Test fixture ........................................................................................................................ 55 4.4.4 Comparison between simulations result and measurements ............................................. 56 4.4.5 Conclusion ........................................................................................................................ 59 4.5 VALIDATION OF MASK DEFINITION AND ASSIGNMENT REQUIREMENT ..................................................... 60 4.6 VALIDATION OF THE QUICK FILE AUTOMATIC TRANSMISSION ................................................................ 61 5. PCB DESIGN METHODOLOGY.......................................................................................................... 63 5.1 CURRENT STATUS OF A PCB DESIGN PROCESS .................................................................................... 63 5.2 INTEGRATION OF THE SIMULATION TOOL .......................................................................................... 63 5.2.1 Diagram of a design flow after integration of the simulation tool ..................................... 64 5.2.2 Engineering design phase ................................................................................................. 65 5.2.3 CAD (Computer Aided Design) phase................................................................................. 67 5.3 SIGNIFICANT BENEFITS OF THE TOOL ................................................................................................ 69 5.3.1 Benefits at Pre-layout phase ............................................................................................. 71 5.3.2 Benefits at Layout phase ................................................................................................... 71 5.3.3 Benefits at Post-layout phase ............................................................................................ 73 5.3.4 Saving of time estimated .................................................................................................. 75 6. LIMITATIONS TO BE IMPROVED IN THE SIMULATION ..................................................................... 78 6.1 RADIATED EMISSION SIMULATION ................................................................................................... 78 6.2 COMPONENT MODEL PARAMETERS .................................................................................................. 78 6.3 PRE-LAYOUT ANALYSIS OPTION ....................................................................................................... 78 ref.: XXXXX 8 /398 Issue 1 Ce document est la proprit dAEROSPATIALE. Il ne peut tre communiqu des tiers et/ou reproduit sans autorisation crite pralable dAEROSPATIALE. This document is the property of AEROSPATIALE. It cannot be disclosed and/or reproduced without AEROSPATIALE written approval. XXX
  • 9. OMEGA PROJECT : Validation test report 7. ANNEXE : ....................................................................................................................................... 79 SYNTHESIS OF RESULTS ACQUIRED WITH A NORMALLY ROUTED CPU BOARD...................................... 79 7.1 SIGNAL INTEGRITY CHECK .............................................................................................................. 80 7.1.1 Clock signal ....................................................................................................................... 80 7.1.2 Control signal nets .......................................................................................................... 106 7.1.3 Data and address signal nets .......................................................................................... 126 7.2 NOISE ON VCC PLAN .................................................................................................................. 148 7.3 NOISE ON GROUND PLAN ............................................................................................................ 164 8. ANNEXE : ...................................................................................................................................... 176 SYNTHETIS OF RESULTS ACQUIRED WITH A MULTIBOARD SYSTEM .................................................... 176 8.1 CONFIGURATION WITH A CPU BOARD AND AN IO BOARD INTERCONNECTED THROUGH A BACKPLANE NORMALLY ROUTED.................................................................................................................................. 177 8.1.1 Signal integrity check ...................................................................................................... 179 8.1.2 Noise on the backplane logical ground ........................................................................... 372 8.2 CONFIGURATION WITH A CPU BOARD AND AN IO BOARD INTERCONNECTED THROUGH A BACKPLANE WILLINGLY DEGRADED............................................................................................................................... 264 ref.: XXXXX 9 /398 Issue 1 Ce document est la proprit dAEROSPATIALE. Il ne peut tre communiqu des tiers et/ou reproduit sans autorisation crite pralable dAEROSPATIALE. This document is the property of AEROSPATIALE. It cannot be disclosed and/or reproduced without AEROSPATIALE written approval. XXX
  • 10. OMEGA PROJECT : Validation test report ABREVIATIONS LIST BMC Backplane Mother Board CAD Computer Aided Design EMC ElectroMagnetic Compatibility EMIR EMIssion Radiated GUI Graphic User Interface HDT High Design Technology IBIS Input/output Buffer Information Specification OMEGA Optimisation of Multi board systems under Emc Guidelines for Avionics PCB Printed Circuit Board PRESTO Post-layout Rapid Exhaustive Simulation and Test of Operation SSN Simultaneous Switching Noise SCSB Standard Computer System Bus TDR Time Domain Reflectometer XTALK traces cross-TALK Xsection Cross section ref.: XXXXX 10 /398 Issue 1 Ce document est la proprit dAEROSPATIALE. Il ne peut tre communiqu des tiers et/ou reproduit sans autorisation crite pralable dAEROSPATIALE. This document is the property of AEROSPATIALE. It cannot be disclosed and/or reproduced without AEROSPATIALE written approval. XXX
  • 11. OMEGA PROJECT : Validation test report 1. Purpose This document is the final tests report which is owed in the framework of the project OMEGA and which closes the task 4. It presents the philosophy of the validation test, all the results analysis details and the investigation led to understand the differences between simulations and experiments. ref.: XXXXX 11 /398 Issue 1 Ce document est la proprit dAEROSPATIALE. Il ne peut tre communiqu des tiers et/ou reproduit sans autorisation crite pralable dAEROSPATIALE. This document is the property of AEROSPATIALE. It cannot be disclosed and/or reproduced without AEROSPATIALE written approval. XXX
  • 12. OMEGA PROJECT : Validation test report 2. Recall of the validation objectives The main objective of this validation : is to test the PRESTO_MBMS V1.1 tool functional features through the users requirements retained for the task 4 of the Omega project and presented in the document referenced 399.0026/99. to verify and to evaluate the capability of the tool to improve a PCB design (changes in the layout design or changes in component values) by means of a what-if analysis The philosophy of PRESTO_MBMS V1.1 validation is essentially based on the comparison between simulation results and lab measurements. Mismatched results (differences between the two results) are investigated and if necessary, the...