SFF8431简介及SFI电气参数测试剖析.ppt

SFF-8431簡介及簡介及SFI電氣參數測試電氣參數測試 SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析AgendaØIntroduction of SFF-8431ØSFF-8431 Standard Compliance Test of SFIØEye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Introduction of SFF-8431Introduction of SFF-8431Introduction of SFF-8431Introduction of SFF-8431ØØ BRIEF INTRODUCTION OF BRIEF INTRODUCTION OF SFF-8431SFF-8431The specification of SFF-8431 defines the electrical interfaces and their test methods between the SFP+ module and host board for operation up to 11.1 GBd. The high speed electrical interface between the host and SFP+ module is called “SFI”. SFI simplifies the module and leverages host based transmit pre-emphasis and host based receive equalization to overcome PCB and external media impairments. SFI typically operates with one connector at the module interface and up to about 200 mm of improved FR4 material or 150 mm of standard FR4. The electrical interface is based on high speed, low voltage AC coupled logic with a nominal differential impedance of 100 Ω. The SFP+ specifications includes management, low speed signal, high speed signal, connector (defined by SFF-8083), mechanical (defined by SFF-8432), and appendices providing parameter and test board definitions, and implementation and measurement descriptions. SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Introduction of SFF-8431Introduction of SFF-8431Introduction of SFF-8431Introduction of SFF-8431Ø The SFP+ SUPPORTED STANDARDSSFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Introduction of SFF-8431Introduction of SFF-8431Introduction of SFF-8431Introduction of SFF-8431ØØ POWER SPECIFICATIONS OF SFP+ POWER SPECIFICATIONS OF SFP+n The module signal ground contacts VeeR and VeeT should be isolated from module case.n At host power up the host shall supply VccT and VccR to the module within 100 ms of each other. n SFP+ low speed signaling is based on Low Voltage TTL (LVTTL) operating with a module supply of 3.3 V +/-5% and with a host supply range of 2.38 to 3.46 V.n To avoid exceeding system power supply limits and cooling capacity, all modules at power up by default shall operate with ≤1.0 W. Hosts supporting Power Level II operation may enable a Power Level II module through the 2-wire interface. Power Level II modules shall assert the power level declaration bit of SFF-8472.. Over long spans such as the 40km Ethernet extended reach (ER) long wavelength applications, the SFP+ transceivers may require additional power consumption, especially at extreme operating conditions.• Power Level I modules – Up to 1.0 W • Power Level II modules – Up to 1.5 WGENERAL REQUIREMENTS SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Introduction of SFF-8431Introduction of SFF-8431Introduction of SFF-8431Introduction of SFF-8431n n The maximum power level is allowed to exceed the classified power level for 500 ms following hot insertion or power up, or Power Level II authorization, however the current is limited to values given by the following table. POWER SPECIFICATIONS OF SFP+POWER SPECIFICATIONS OF SFP+SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Introduction of SFF-8431Introduction of SFF-8431Introduction of SFF-8431Introduction of SFF-8431n n The SFP+ module shall meet ESD requirements given in EN61000-4-2, criterion B test specification such that units are subjected to 15 kV air discharges during operation and 8 kV direct contact discharges to the case. SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Introduction of SFF-8431Introduction of SFF-8431Introduction of SFF-8431Introduction of SFF-8431ØØ HIGH SPEED ELECTRICAL SPECIFICATIONS of SFI HIGH SPEED ELECTRICAL SPECIFICATIONS of SFISFI signaling is based on differential high speed low voltage logic with AC coupling in the module. SFI was developed with the primary goal of low power and low electromagnetic interference (EMI). To satisfy this requirement the nominal differential signal levels are ~500 mV p-p with edge speed control to reduce EMI.SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Introduction of SFF-8431Introduction of SFF-8431Introduction of SFF-8431Introduction of SFF-8431n PCB LAYOUT RECOMMENDATIONS•The PCB traces are recommended by the specification to meet 100±10Ω differential impedace with nominal 7% differential coupling. It is preferable to have the impedance tolerance be ±5Ω.•Route differential pairs at least 8x their trace-width from other traces. Avoid sharp angles in routing, chamfer corners.•In order to avoid reflection, the recommended minimum trace length requirement is “1 inch” in FR4.•When there must be vias on the high-speed differential signals, the 100 differential vias is recommended be used. And stubs due to vias must be avoided.•The maximum SFI trace length recommend by the specification of SFF-8431.SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析SFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFIlTEST ENVIRONMENT REQUIREMENTS1.The bandwidth of measurement instrument shall be 12 GHz or above;2.Require AC coupled test equipment on all test ports；3.All SFI test equipment must have 50ohm single ended impedance；4.Reference impedance for differential measurements is 100ohm, and the reference impedance for common mode measurements is 25ohm;5.Host compliance test board is required.n n SFF-8431 STANDARD COMPLIANCE TEST of SFI SFF-8431 STANDARD COMPLIANCE TEST of SFISFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析nTEST METHODOLOGY AND MEASUREMENT A.HOST COMPLIANCE TESTA.1 Test point Host system transmitter and receiver compliance are defined by tests in which a Host Compliance Board is inserted in place of the SFP+ module. The compliance points are B.SFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析A.2 Measurement setupSFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析A.2 TEST EQUIPMENTSFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析A.3 Host Transmitter Output Jitter and Eye Mask Specifications at B SFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析B.10GSFP+Cu DIRECT ATTACH CABLE Compliance TestCompliance Test 10GSFP+Cu cable assemblies are effectively constructed out of a pair of SFP+ modules with the OE components replaced with copper cabling. The cable assembly shall incorporate DC blocking capacitors with at least 4.3 V rating on the RX side and with high pass pole of between 20 kHz and 100 kHz. The drain wire is connected to VeeT and to VeeR. The cable shield directly connects the module A and B cases. B.1 10GSFP+Cu Direct Attach ConstructionSFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析SFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFIB.2 SFP+ Direct Attach Cable Test SetupSFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析SFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFISFF-8431 Standard Compliance Test of SFIB.3 10GSFP+Cu Cable Assembly Specifications at B’ and C’ SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析A.Our Test EnvironmentFigure 1Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析B.B.Key features of Test InstrumentsKey features of Test InstrumentsØDSA8200 Digital Serial Analyzer •DC to 65 GHz optical bandwidth; DC to 70+ GHz electrical bandwidth, with up to 12.5 GHz triggering. Bandwidth is determined by the capabilities of the installed modules;ØCR125A Electrical Clock Recovery instrument•100 Mb/s to 12.5 Gb/s continuous data rate coverage;•Single-ended or differential 50 Ω data inputs/outputs;•DC coupled data through path;•Insertion loss: -2.6dB when 12GHzØ80E04 Electrical Sample ModuleØ SMA RF coaxial cable with up to 18G bandwidth and the insertion loss is 1.4dB/m when 10GHz.Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析C.Installing Test EnvironmentCautionsüDo NOT apply a signal outside the Maximum Input Voltage Swing; üAlways use a wrist strap when making signal connections;üDischarge to ground any electrostatic charge that may be present on the center and outer conductors of cables before attaching the cables to the instrument;üNever install or remove modules while the instrument is powered on; üDo NOT transport or ship the instrument with modules installed;üIf possible, always use ESD protection module(80E02) along the test path, example, TDR test ;üAlways disable the 80E04’s TDR function when not use the TDR function.Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析C.1 Acquainted with Our Instrumenta)DSA8200 Digital Serial AnalyzerEye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析b)CR125A Electrical Clock Recovery instrumentEye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析c)80E04 Electrical Sampling Module with TDR function.Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析C.2 Eye Diagram Test Environment Setup of SFINotes：Please see the attached notes to set the eye diagram test setup.Step 1. Installing the hardware environment Step 1. Installing the hardware environment asas “ “figure 1figure 1” showing;” showing;Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Step 2. Step 2. POWER ON the instruments and wait 20 minutes for instruments warm-up period POWER ON the instruments and wait 20 minutes for instruments warm-up period ; ;SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Step 3. Step 3. Confirm the TDR function is DISABLED during the eye diagram test to avoid damage Confirm the TDR function is DISABLED during the eye diagram test to avoid damage the 80E04 TDR module;the 80E04 TDR module;Notes: Confirm those check-box under “TDR” SETUPS is unchecked to disable the TDR functions on the test channel.SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Step 4. Execute compensation and wait until the status of all items warm up to PASS ; If the Step 4. Execute compensation and wait until the status of all items warm up to PASS ; If the status is Fail, rerun the compensation. If Fail status continues and you have allowed warm up status is Fail, rerun the compensation. If Fail status continues and you have allowed warm up to occur, the module or main instrument may need service.to occur, the module or main instrument may need service.SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Step 5. Setting software environment;Step 5. Setting software environment;1.Setting the Display StyleNotes: Select the Infinite Persistence on the “Disp” and the “fast sampling” mode on the front panel.Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析2.Setting triggerNotes: Select the External Prescaler as the trigger source.Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析3.Setting Math as sourcesEye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Notes：For differential signal eye test, subtract the two differential sources we using to define a math as the aimed signal source.SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析4.Waveform DatabasesEye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Notes：Select the math we had defined as the waveform database and choose the infinite mode to display it.SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析5.Mask SettingEye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Notes：Select our aimed eye mask in the drop-down menu or import customer mask we had defined.SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析3.Setting Measurements Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Notes：Select the signal source and set signal type to “NRZ”. Then, set measurement we aimed to show on the screen, for example, eye height, eye width, Pk-Pk jitter, RMS jitter, and so on.SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析6.Set a STOP ActionEye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析7.Restart TestingEye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Step 3Step 3：：：： Calibrate our test installingCalibrate our test installingThe propagation delay inherent in connecting cables and probes can result in inaccurate amplitude and time-correlated measurements.. To obtain the best measurement and analysisresults from your instrument, you will need to remove skew and compensate the attenuations in the test environment.Quick Tipsn Minimize skew by using balanced cable pairs.n Measure and match your cables. TDR modules such as 80E04 allow you to measure cable delays with very high precision.n Compensate the attenuations on the cables and peripherals(CR125A).SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200ØØDe-skew Cable Delay ProcedureDe-skew Cable Delay ProcedureSFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Eye Diagram Test by DSA8200Congratulations, that’s all the installing of our test procedures blow, and you can begin your test now!!!Congratulations, that’s all the installing of our test procedures blow, and you can begin your test now!!!Congratulations, that’s all the installing of our test procedures blow, and you can begin your test now!!!Congratulations, that’s all the installing of our test procedures blow, and you can begin your test now!!!ØØ Compensate the Attenuation on the signal path Compensate the Attenuation on the signal pathFor example, the nominal attenuation on the CR125A is -2.6dB and the coaxial cable is -0.7dB/m, we used one two 0.5m coaxial cable each channel, so, we should compensate 4.0dB/channel on our differential signal path.Notes：Use the vertical buttons to compensate the channel we used.SFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析Q&ASFF8431简介及简介及SFI电气参数测试电气参数测试剖析剖析。