USB 3.0 Overview and Physical Layer testing requirements

Transcription

1 USB 3.0 Overview and Physical Layer testing requirements Industry update and Testing Challenges Update Jim Choate Agilent Technologies Page 1

2 Agenda Introduction Agilent Digital Standards USBIF Compliance Program Status USB Specification Updates Physical Layer Testing ECN changes to Physical Layer Testing Physical Layer Compliance Test Pitfalls Precision Probe and Cable Summary Questions 2 Page 2

3 Agilent Digital Standards Program Our solutions are driven and supported by Agilent experts involved in international standards committees: Joint Electronic Devices Engineering Council (JEDEC) PCI Special Interest Group (PCI-SIG ) Video Electronics Standards Association (VESA) Serial ATA International Organization (SATA-IO) USB-Implementers Forum (USB-IF) Mobile Industry Processor Interface (MIPI) Alliance And many others We re active in standards meetings, workshops, plugfests, and seminars. We get involved so you benefit with the right solutions when you need them SuperSpeed USB Page 3

4 We understand your future requirements, because we help shape them Rick Eads PCI-Sig Board Member Brian Fetz DisplayPort Phy CTS Editor VESA Board Member Jim Choate USB-IF Compliance Committee USB 3.0 Electrical Test Spec WG Min-Jie Chong SATA 6G / PHY / LOGO Contributor SATA-IO Gold Suite Lead Perry Keller JEDEC Board Member The Agilent Infiniium Scopes team maintains engagement in the top high tech standards organizations

5 USB Implementers Forum, inc (USB-IF) owner responsible USBIF Board Members Intel, NEC, HP, Microsoft, ST-Ericsson, LSI Marketing WG OTG WG Device WG CabCon WG Compliance Review Board Compliance Committee Test Spec WG influences USB Test Specs Agilent Active Membership owner USB2/USB 3 Tools and Test Procedures influences Training and equipment Test House Approval Interop. Workshop Testing 5

6 Worldwide Shipment of USB-enabled Devices USB is the most successful interface in the history of PC Device charging over USB has become a major consumer feature USB installed base is 10+ billion units and growing at 3+ billion units a year Adoption is virtually 100% in PC and peripheral categories Units in Thousands USB-enabled Device Shipments and Forecast: ,000,000 4,500,000 77M 436M 902M 4,000,000 3,500,000 3,000,000 2,500,000 2,000,000 1,500,000 1,000, , USB Low or Full Speed USB High Speed USB SuperSpeed Source: In-Stat, May

7 USB-IF Specification updates and additions HSIC a low power USB chip to chip solution designed for mobile applications SSIC USB 3.0 performance extension for chip to chip solution designed for mobile applications (download with USB 3.0 spec). Uses M-PHY for physical layer. USB 3.0 SuperSpeed above Link Layer USB Power Delivery Spec an expansion of USB power delivery to allow more flexible power delivery up to 100W. Power direction is no longer fixed. All USB-IF specifications are available at

8 Key Features of the USB Power Delivery Spec 8

9 10Gbps SuperSpeed overview Specification near version 0.7. Industry review scheduled for Feb 7 th, 2013 Key characteristics of the higher-rate SuperSpeed USB solution include: 10 Gbps USB data rate Compatibility with existing cables and connectors 128b/130b (TBD) data encoding for more efficient data transfer leading to higher throughput and improved I/O power efficiency Compatible with existing USB 3.0 software stacks and device class protocols Compatible with both existing 5 Gbps and new 10 Gbps USB 3.0 hubs and devices, as well as USB 2.0 products

10 10Gbps SuperSpeed considerations Re-driver design considerations must be designed with re-drivers accounted for in specification budgets. Speed negotiation handshake Channel definitions. 10Gbps SuperSpeed USB Industry Review Conference register by Feb 1 st. Conference will review rev 0.7 draft specification Go to For updates and information. 10

11 USBIF USB 3.0 Certification Test Requirements Electrical Test Equipment and USBIF test software Protocol Test Equipment and USBIF test software 11

12 What does USB Certification mean (Access for USBIF Members Only) Products listed on the Integrators list (member optional) Certification also allows member company to use the official USBIF logo(s) on their product and marketing materials. Tests run at USB-IF Compliance Test Workshop Testing with approved Independent Test Labs Testing at USB-IF Platform Interoperability Lab (PIL only for hosts/hubs) 12

13 Agilent USB Workshop Testing solutions USB 3.0 Electrical Gold Suite Protocol Testing Tx Testing DSA91304A/X Oscilloscopes RX Testing N4903B J-BERT N4916A/B D-box Test and debug Interop issues, Backward compatibility, software and firmware USB 2.0 Electrical Gold Suite Tx Testing DSA9254A RX Testing 81134A or 81130A ENA TDR Cable Testing ENA 5071C with option TDR Informational Cable Testing Connector Testing Device, hub and host testing 13 Page 13

14 USB2.0 Basics General Universal Serial Bus (USB) 2.0: All USB specifications are owned by the USB-IF (Implementers Forum, Inc.) USB2.0 is an EXTENSION of USB1.1 USB-IF states USB2.0 is the CURRENT ver. of the USB. USB1.1 is available for historical reference only. USB 2.0 Has 3 Transfer Speeds Low Speed (LS) = 1.5Mbps Full Speed (FS) = 12Mbps Hi-Speed (HS) = 480Mbps USB 3.0 Has 1 Transfer Speed Superspeed (SS) = 5Gbps USB2.0 HS USB1.1 LS/FS USB 3.0 5G SS 10G SS+ 14

15 USB2.0 Basics - Architecture USB Architecture Down stream Host / System Hub Up stream Differential Signal Max USB cable length of 5m Up to 5 Hubs Data from PC to the device is called Downstream Data from device to PC is called Upstream 15 Devices USB Cable + Shield D+ VBUS D- Ground

16 USB2.0 Basics - Signal Rates & Levels Low Speed Full Speed Hi-Speed Sig Rate 1.5Mbps 12Mbps 480Mbps Sig Level 3.3V 3.3V 400mV Rise and Fall Times 75ns < Tr <300ns 4ns < Tr < 20ns Tr > 500ps* *High Speed USB edge rate compliance measurement method and pass/fail criteria have been changed. This will be explained in the compliance requirements section.

17 Host test requirements 17

18 Which Host Eye is Correct? 18

19 New USBIF Required USB2 SQ Test Fixtures Note: USBIF fixture does not have switching relay + Gives host SQ more margin - Cannot make any other meaurements with this fixture - Embedded hosts need to enumerate VID/PID EH compliance fixture to go into test packet mode 19

20 What is different for USB 3.0 USB 2.0 High Speed 480Mbps NRZI, Half Duplex 4 signals Dp, Dm, VCC, GND Cable Lmax= 5meter I configlp/fp = 100mA/500mA I suspend = 2.5mA No SSC TX SQ at Near End No Host RX testing USB 3.0 SuperSpeed 5 Gbps 8B/10B PRBS, Full Simplex 8 signals 4 USB2, 4 SS Signals Cable L max = 3 meters I configlp/fp = 150mA/900mA I suspend = 2.5mA SSC TX at End of Channel (Far end) RX Jitter tolerance TX Half Duplex TX RX Full Simplex TX RX RX TX RX 20

21 Biggest Challenges for USB 3.0 Testing Receiver testing Getting DUTs into loopback Margins are tight EMI interference issues have been reported with WiFi. ECNs 21

22 U7243A USB 3.0 TX Compliance Application Agilent s U7243A TX compliance test application TX tests: LFPS (Near end) SSC (Near end) TX (Far End: TP1) Eye Pattern Tj, Rj, Dj Amplitude Embedded channel automatically tested using Agilent U7243A compliance software 22

23 Transmitter test requirements (TX Far End) 23

24 Tx testing emulated through s-parameters Embed Channel File DEVICE_3MCABLE.s4p Validation with InfiniiSim of DSA91304A 24

25 TX Testing Requirements: Polling.LFPS to compliance mode PING LFPS Toggles CMM CP0 Dj CP1 Rj 25

26 Toggling USB 3.0 TX test modes Connect Aux Out to DUT SSRX+ to toggle test modes 26

27 Transmitter testing uses embedded compliance channel 27

28 Compliance Channels Compliance Channels are used to test TX and RX for worst case channel conditions Back panel USB route solution Channel loss will dominate Host 11 of trace Device 5 of trace 3 meter USB 3.0 cable Short Channel Compliance Channel will be Part of compliance requirements later this year. Short Channel = no cable and short PCB traces 28

29 SuperSpeed Host Receiver Test Calibration and compliance channel Device 5 of trace 3 meter USB 3.0 cable Host Channel setup

30 SuperSpeed Device Receiver Test Calibration and compliance channel Host 11 of trace 3 meter USB 3.0 cable Device Channel setup

31 New channel definitions being defined Compliance Channels used need to change for products that use micro connectors/cables. Device and host channel portion stays the same Micro spec only allows 2 meter USB 3.0 cable today Micro spec ECN is reducing that to 1 meter maximum in ECN under review. 31

32 Fixtures and cables available from the USBIF at:

33 New build of USB-IF Fixture kit now available Old Fixture New Fixture New fixtures include improved SMA connectors 33

34 USB 3.0 SuperSpeed Receiver Test Setup for Devices with J-BERT B SER Counter Connect the equipment as shown below - Use DC blocking capacitors in the connection from the J-BERT/De-Box output to the test fixture input - For host testing: Additional cabling and a BIAS tee are required - All necessary connections are displayed in the N5990A software, too N4903B Device Test Fixture 1 USB N4916B Device Test 11742A Fixture 2 Blocking Caps 11 use upper Port 3m USB3 cable 5V DUT Short USB3 cable

35 USB 3 Loopback Training

36 USB 3 Loopback Training

37 Typical SuperSpeed Link Turn-on Sequence

38 USB 3 Reciever Test Automation using N5990A automation sw

39 SuperSpeed Receiver Tests Rx Compliance and Jitter Tolerance Testing

40 SuperSpeed Receiver Test Calibration and compliance channels

41 Engineering Change Notices (ECNs) 41

42 ECN 009 USB 3 (Standard-B Connector Near End Crosstalk) If a Standard-B or Powered-B connector fails to meet the -32 db requirement in frequency domain shown in Figure 5-24 (b), but is able to meet the -27dB requirement shown in Figure 5-24(a), the measurement of DDNEXT in time domain will be required. 42

43 ECN 009 USB 3 (Standard-B Connector Near End Crosstalk) Measurement of DDNEXT Measurement of DDNEXT in time domain. 43

44 What is the Short Channel Definition & Why? USB 3.0 Flash drives are the best example where short channels are the norm For discrete hosts the xhci controllers are frequently place very near the USB 3.0 connectors with very short PCB traces In this use case the loss of the channel is very small and it is critical that RX equalizers have sufficient dynamic range to operate in a low loss channel environment 44

45 USB3.0 Reference Equalizer ECN Current testing reference equalizer is for a long channel 3m cable plus long host PCB trace (~18-20dB differential insertion loss). proper equalizer behavior is critical for interoperability in a short channel (no cable and short host PCB, ~3-5dB differential insertion loss) ECN defines a second reference equalizer transfer function that is optimized for the short channel 45

46 Physical Layer Compliance Pitfalls Transmitter SSC quality Loopback issues Dut needs custom sequence DUT drops out easily Calibration issues Inconsistent Poor Sj/Rj mod Automation of Cal Failing de-emphasis Great impact on TJ and Eye Jitter tolerance failures 10Mhz, 20Mhz, 33Mhz Compliant SJ Poor/wrong SJ Compliant SSC Profile Intentional SSC Stress Non-deterministic noisy SSC Compliant De-emphasis Non-compliant Overshoot 46

47 PrecisionProbe and Cable (N2809A) Characterize and correct any input path to your oscilloscope input using only your oscilloscope

48 The Importance of a Flat Frequency Response Why do we care about a flat frequency response? - The flatter the response the more accurately the scope will depict the signal - Measurements become more repeatable - ISI modeled closer to the reality Frequency response of the X-Series 48

49 Eye margin improvement using precision cable 23.8% Increase in eye height 49

50 The Solution: PrecisionProbe PrecisionProbe Quickly and Easily: - Characterizes and corrects the frequency response (Vout/Vin) of phase of any probe and probe head combination - Characterizes and corrects for insertion loss caused by cables and fixtures - Characterizes and corrects for insertion loss caused by switches for probes and cables. - For a typical 10-12Ghz cable USB3 eye margin can improve 10-20mV 50

51 USB 3.0 Protocol Decode: on the scope 51

52 NEW: Agilent N8900A InfiniiView Oscilloscope Analysis Software View, analyze, share and document from your PC Free up your scope to actually make measurements Operates just like the scope Undock to better view result windows with multiple monitors 52

53 Agilent High Speed Inter-Chip test solutions HSIC is a supplement to the USB 2.0 specification developed primarily by chip vendors to provide simpler and lower power interface between a USB host and device Specification is included with USB 2.0 specification located here: Agilent U7248A HSIC compliance test software Used in conjunction with Agilent s U5464A/B USB protocol triggering and decode software, developers have a complete set of tools to validate/debug HSIC solutions. 53

54 SW USB 3.0 Total Solution Transmitter Test N8805A USB3.0 Protocol decode & triggering SW U7243A USB Compliance Test Software Interconnect Test Receiver Test N5990A Automatic SW for USB compliance Protocol Test (link/transaction layers) U4612A Jammer HW DSOX90000A Infiniium real time scope or DSO91304A Infiniium real time scope E5071C Option TDR ENA Network Analyzer N4903B J-BERT High-Perf Serial BERT with U4611A/B USB 3\2\1.1 Analyzer Signal Conditioning De-emph N4916A or N4916B or N4903B-002 U7242A Test Fixture Fixture DUT U7242A USB 3.0 Test Fixture Tx Bit-USB- CBL-0001 from BitifEye Cable USB3ET from USB-IF Tx Rx Tx Rx Tx Rx 54

55 Conquering USB 3.0 Physical Layer Test Challenges USB 3.0 Protocol Development Don Schoenecker Agilent Technologies

56 Agenda Analyzing USB 2.0 and 3.0 MS Traffic Communication layers (power management) LTSSM Link Management Transaction layer Active Testing Questions 56

57 Capturing USB data traffic Simultaneous 2.0 and 3.0 traffic Ethernet or PCIe control USB / 12 / 480 Mbps Single HDX differential link Polling Token, Data, Handshake USB Gbps 2 unidirectional links Device notification Data, Handshake USB test DUT USB 2.0/3.0 host ports 57

58 Capturing USB 3.0 and 2.0 Simultaneously Transaction View Data capture of 2.0 and 3.0 mass store operations USB protocol transactions are very different Transaction are the same 58

59 SuperSpeed Bus Communications Layers and Power Management Elements

60 Timing events for link states

61 8b/10b Decode and display

62 LTSSM

63 Example Trace - POLLING.LFPS X O = 952ns tburst time for Polling.LFPS

64 Example Trace U1 Entry/Exit U2 Inactivity Timer is set to 256us. So Link silently entered into U2 after spending 256us in U1. X-O = ~392us total time in Elec Idle

65 Synchronizing the USB analysis traces from Protocol to Electrical Diagnostic requires synchronization of protocol events to a physical trace on an Oscilloscope Uses a physical connection between the two pieces of equipment SMA cable going from the trigger out on the Agilent USB analyzer to the trigger in on the Agilent scope. The scope should be setup to trigger on an high to low alternating signal. Trig IN / Trig OUT for use with other Agilent equipment 65

66 Active Testing Test environment Control Three Methods Golden Device Generator Active Insertion - Jammer Command A Command B What are the benefits of Active Insertion Testing? (Jammer) Common Use operation - Error Injection Scenario Testing Protocol problem Problem replication SCSI command modification 66

67 Agilent U4612A USB 3.0 Jammer Quickly and easily create test scripts to simulate real error conditions. Programmatic control of error conditions. Can be used to create a variety of errors PHY errors (Disparity, 8b/10b, align) CRC-5/16/32 errors Corrupted ordered sets, LMPs, etc. LGOOD_n / LCRD_a out of order Link connect / disconnect Power up / down (bus powered devices only) Missing or corrupt frames BOT (Bulk Only Transport) or UAS (USB Attached SCSI) Sense IU / Response IU errors Standalone unit (does not require U4611A/B analyzer)

68 Simple test Verifying Proper handling of errors Physical tests USB DUT 10b errors Command B Testing of Protocol Operations Invalid Link commands (Link command words are not equal) Command is ignored Send two LMP packets with Header Sequence Numbers that are not sequential Link goes into recovery Agilent U4611A USB 2.0/3.0 Analyzer Agilent U4612A USB 3.0 Jammer Wrong LCRD_X Sequence Test Link Recovery Command A USB Host Golden Device

69 Jammer Example tests Physical Layer stress testing - Insert 8b/10b error in data packet - 10b code error in packet framing Link Command testing - Incorrect buffer sequence numbering - Link command response timeout Application Level testing - Force bypass of disk cache with SCSI command (FUA bit set) - Insert bad data block in disk write 69

70 SW USB 3.0 Total Solution Transmitter Test N8805A USB3.0 Protocol decode & triggering SW U7243A USB Compliance Test Software Interconnect Test Receiver Test N5990A Automatic SW for USB compliance Protocol Test (link/transaction layers) U4612A Jammer HW DSOX90000A Infiniium real time scope or DSO91304A Infiniium real time scope E5071C Option TDR ENA Network Analyzer N4903B J-BERT High-Perf Serial BERT with U4611A/B USB 3\2\1.1 Analyzer Signal Conditioning De-emph N4916A or N4916B or N4903B-002 U7242A Test Fixture Fixture DUT U7242A USB 3.0 Test Fixture Tx Bit-USB- CBL-0001 from BitifEye Cable USB3ET from USB-IF Tx Rx Tx Rx Tx Rx 70

71 2012 was the breakout year of USB 3.0! In 2012, 8 companies had certified USB 3.0 host controllers, a prerequisite to USB 3.0 connectivity AMD ASMedia Etron Fresco Logic Intel Renesas TI VIA Labs Intel launched Ivy Bridge which includes support for USB 3.0, in New Panther Point chipset designed for Ivy Bridge adds native USB 3.0 support Microsoft Windows 8 supports USB

72 Things to Remember if you forget all else Microsoft Windows 8 includes native support for USB 3.0 hosts, hubs and devices Agilent s USB 3.0 TX and RX test solutions are the worldwide market leader for USB 3.0 product development and validation USB 3.0 Receiver testing is the most challenging part of PHY layer testing Agilent provides the industries highest performance USB protocol analyzer and jammer Agilent USB solutions adopted by test labs world wide Confidence in our solution comes from our leadership and participation in standards bodies as well as our deep technical expertise Agilent has the tools and expertise to help you conquer USB 3.0 Physical Layer Test Challenges 72

73 Additional Links and References *All trademarks are the properties of their respective holders. Agilent Oscilloscope information (TX testing solutions) Agilent Oscilloscope application software Agilent N4903B Jbert (Rx testing solutions) Agilent N8900A InfiniiView Oscilloscope Analysis Software Agilent N2809A PrecisionProbe oscilloscope probing software 73