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SIGLENT TECHNOLOGIES EN01A User Manual

Usb 2.0 electrical compliance test
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USB 2.0 Electrical Compliance
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  • Page 1 USB 2.0 Electrical Compliance Test User Manual User Manual EN01A...

  • Page 3: Table Of Contents

    USB 2.0 Electrical Compliance Test User Manual CONTENT Introduction..................... 5 Test Items ......................6 Test Equipment ....................8 SIGLENT Provision ..................... 8 Additional Equipment ....................8 Fixture ......................9 Delivery Checklist ......................9 Introduction to Functional Modules ................10 4.2.1 Signal board ......................
  • Page 4 USB 2.0 Electrical Compliance Test User Manual 7.8.1 Test Steps ......................48 7.8.2 Test Results Reference ..................49 Droop ......................... 49 7.9.1 Test Steps ......................49 7.9.2 Test Results Reference ..................49 Device ......................51 High-Speed US Signal Quality (EL_2, EL_4/EL_5, EL_6, EL_7) ......51 8.1.1 Test Steps ......................
  • Page 5 USB 2.0 Electrical Compliance Test User Manual 9.2.2 Test Results Reference ..................77 High-Speed DS Chirp Timing (EL_33, EL_34, EL_35) ..........80 9.3.1 Test Steps ......................80 9.3.2 Test Results Reference ..................81 High-Speed DS Suspend Resume (EL_38 EL_39, EL_41) ........83 9.4.1 Test Steps ......................
  • Page 6 USB 2.0 Electrical Compliance Test User Manual 10.6.1 Test Steps ...................... 109 10.6.2 Test Results Reference ................. 110 10.7 High-Speed US Not Driven Voltage Levels (EL_8, EL_9) ........112 10.7.1 Test Steps ...................... 112 10.7.2 Test Results Reference ................. 113 10.8 High-Speed US Repeater (EL_42, EL_43, EL_44, EL_45, EL_48) .......

  • Page 7: Introduction

    USB 2.0 Electrical Compliance Test User Manual Introduction FX-USB2 is a test fixture launched with the USB 2.0 compliance test function of SDS7000A digital oscilloscope, and the two together can easily and quickly complete the USB-IF test on all electrical items of hosts, devices and hubs.

  • Page 8: Test Items

    USB 2.0 Electrical Compliance Test User Manual Test Items FX-USB2 and SDS7000A's USB 2.0 compliance test function combine to support the following USB 2.0 electrical compliance measurements:  Host Tests High-Speed DS Signal Quality (EL_2, EL_3, EL_6, EL_7) High-Speed DS Packet Parameters (EL_21, EL_22, EL_23, EL_25, EL_55) High-Speed DS Chirp Timing (EL_33, EL_34, EL_35) High-Speed DS Suspend Resume (EL_38 EL_39, EL_41) High-Speed DS Not Driven Voltage Levels (EL_8, EL_9)
  • Page 9 USB 2.0 Electrical Compliance Test User Manual Downstream: EL_33, EL_34, EL_35 Upstream: EL_28 EL_29, EL_31 High-Speed Suspend Resume Downstream: EL_38 EL_39, EL_41 Upstream: EL_38 EL_39, EL_40 EL_41 Upstream High-Speed to Reset (EL_27, EL_29, EL_31) Upstream Suspend to Reset (EL_28, EL_29, EL_31) High-Speed Not Driven Voltage Levels Upstream/Downstream: EL_8, EL_9 High-Speed US Repeater (EL_42, EL_43, EL_44, EL_45, EL_48)

  • Page 10: Test Equipment

    USB 2.0 Electrical Compliance Test User Manual Test Equipment The following equipment is required for complete USB 2.0 compliance test. SIGLENT Provision  Oscilloscope (SDS7000A): >2GHz BW, with USB 2.0 compliance software (SDS7000A-CT- USB2) activated as the USB 2.0 electrical compliance analysis tool. ...

  • Page 11: Fixture

    USB 2.0 Electrical Compliance Test User Manual Fixture The FX-USB2 is a test fixture launched to match the USB 2.0 compliance test function of the SDS7000A. The processor on the board can control the devices and hubs to enter the test mode, reset, suspend, etc.

  • Page 12: Introduction To Functional Modules

    USB 2.0 Electrical Compliance Test User Manual Introduction to Functional Modules FX-USB2 includes 2 boards, the signal board (USBTF_SQ) and the load board (USBTF_SR). 4.2.1 Signal board The following figure shows the various modules of the signal board, followed by a general description of the role played by each module in the compliance test.

  • Page 13: Test Point

    USB 2.0 Electrical Compliance Test User Manual 4.2.3 Test Point In each module of the fixture, corresponding test points are provided, and the function of each test point is briefly introduced next.  SMA interface: The SMA interface on the signal board, which is connected to D+ and D-, is connected to the oscilloscope through the SMA cable to complete the signal quality test.
  • Page 14 USB 2.0 Electrical Compliance Test User Manual  Test probes: Placed in D+, D-, and VBus respectively, as shown below: J27 connects D+ and D- to provide test points for differential probes, while J29 connects D+ and J28 connects D-, a GND ground point is also reserved to facilitate the connection of single-ended probes;...

  • Page 15: Compliance Test Software

    USB 2.0 Electrical Compliance Test User Manual Compliance Test Software SDS7000A provides USB 2.0 compliance test function, according to Analysis > Compliance Test > Protocol Type Select USB2.0 > Click ON , you can open the compliance test function which is divided into three major parts: Tests Config, Results and Report Setting. Tests Config Clicking on Tests Config will pop up the specific test window, as shown in the figure below, which is divided into six steps according to the test flow: Setup, Test Select, Configure, Connect, Run Test,...
  • Page 16 USB 2.0 Electrical Compliance Test User Manual  Test Select: Select the items to be tested in this section.  Configure: The test item selected before will be highlighted in this column, click to configure the corresponding test item and set the channel for oscilloscope measurement. ...
  • Page 17 USB 2.0 Electrical Compliance Test User Manual  Run Test A. Supports "Continue" and "Stop" options in "Test Failure". B. Supports "Current" and "Append" options for "Test result". Click "Run Test" in the lower right corner to start the round. int.siglent.com...

  • Page 18: Results

    USB 2.0 Electrical Compliance Test User Manual In the next test flow, follow the pop-up window to complete the test, and the test results will pop up after all the test items are completed. If you select multiple test items in one round of test, there will be a pop-up window prompting the wiring mode of the item when you proceed to the next item, and you can go back to the "Configure"...

  • Page 19: Report Setting

    USB 2.0 Electrical Compliance Test User Manual Report Setting Click "Report Setting", fill in the relevant test information, select the report type. Click "Preview Report" to view the effect of the generated report in advance. Click "File Manager" to select the path to save and click "Save"...
  • Page 20 USB 2.0 Electrical Compliance Test User Manual int.siglent.com...

  • Page 21: Usb If Official Application

    USB 2.0 Electrical Compliance Test User Manual USB IF Official Application USB IF provides software to assist with USB 2.0 electrical compliance test.  USBET20: USB IF official electrical analysis tool that to analyze the signal data captured by the oscilloscope, including signal quality and inrush analysis.
  • Page 22 USB 2.0 Electrical Compliance Test User Manual Choose "Host Controller/System", click the "Test" button to enter the host test menu. The Host Control menu provides options for placing the host controller or a device connected to that controller into the electrical test mode. Select the appropriate command from the Port Control or Downstream Device Control Menu.

  • Page 23: Host

    USB 2.0 Electrical Compliance Test User Manual Host When performing USB 2.0 host-related tests, please set up the compliance test function correctly according to the test requirements. High-Speed DS Signal Quality (EL_2, EL_3, EL_6, EL_7) 7.1.1 Test Steps 7.1.1.1 Test Environment Setup A.
  • Page 24 USB 2.0 Electrical Compliance Test User Manual A. Open the High-speed Electrical Test Tool software and enter the main menu of the software. B. Select [Host Controller/System] for Test Type, and then click [TEST] to enter the Host Test menu. Select [TEST_PACKET] in the drop-down menu of Port Control, and enter the number of the test port of the device under test in Port.

  • Page 25: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual 7.1.2 Test Results Reference  EL_2: A USB 2.0 high-speed transmitter data rate must be 480 Mb/s±0.05%.  EL_3: A USB 2.0 downstream facing port must meet Template 1 transform waveform requirements measures at TP2. ...

  • Page 26: High-Speed Ds Packet Parameters (El_21, El_22, El_23, El_25, El_55)

    USB 2.0 Electrical Compliance Test User Manual High-Speed DS Packet Parameters (EL_21, EL_22, EL_23, EL_25, EL_55) 7.2.1 Test Steps 7.2.1.1 Test Environment Setup D+、D- A. For "Single Ended", J29 and J28 are the test points for D+ and D- signals respectively, and for "Differential Probe", the test point is J27.
  • Page 27 USB 2.0 Electrical Compliance Test User Manual 7.2.1.2 HSETT Sending Packet Setup 7.2.1.2.1 First Time Sending Packets If you are using HSETT software, please follow the instructions in the following steps to send packets. If you are sending packets by yourself, please click "Run Test" after observing the waveform captured by the oscilloscope.
  • Page 28 USB 2.0 Electrical Compliance Test User Manual C. After observing the waveforms captured by the oscilloscope, the D+ and D- differential waveforms are referenced as shown in the figure below, click "Run Test". If the oscilloscope does not capture the waveforms or the waveforms differ greatly from the reference waveforms, please check if the wiring is correct and start from step A again.

  • Page 29: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual 7.2.2 Test Results Reference  EL_21: The SYNC field for all transmitted packets (not repeated packets) must begin with a 32 bit SYNC field.  EL_22: When transmitting after receiving a packet, hosts and devices must provide an inter- packet gap of at least 8 bit times and not more than 192 bit times.
  • Page 30 USB 2.0 Electrical Compliance Test User Manual  EL_23: Hosts transmitting two packets in a row must have an inter-packet gap of at least 88 bit times and not more than 192 bit times.  EL_25: The EOP for all transmitters’ packets (except SOFs) must be an 8 bit NRZ byte of 01111111 without bit stuffing.
  • Page 31 USB 2.0 Electrical Compliance Test User Manual  EL_55: Hosts transmitting SOF packets must provide a 40 bit EOP without bit stuffing where the first symbol of the EOP is a transition from the last data symbol. int.siglent.com...

  • Page 32: High-Speed Ds Chirp Timing (El_33, El_34, El_35)

    USB 2.0 Electrical Compliance Test User Manual High-Speed DS Chirp Timing (EL_33, EL_34, EL_35) 7.3.1 Test Steps 7.3.1.1 Test Environment Setup D+、D- A. J29 and J28 are test points for D+ and D- signals respectively. B. The host under test is accessed in J33 and a USB 2.0 certified high-speed device is accessed in J32.
  • Page 33 USB 2.0 Electrical Compliance Test User Manual 7.3.1.2 HSETT Sending Packet Setup 7.3.1.2.1 First Time Sending Packets If you are using HSETT software, please follow the instructions in the following steps to send packets. If you are sending packets by yourself, please click "Run Test" after observing the waveform captured by the oscilloscope.
  • Page 34 USB 2.0 Electrical Compliance Test User Manual 7.3.1.2.2 Second Sending Packets If you are using HSETT software, please follow the instructions in the following steps to send packets. If you are sending packets by yourself, please click "Run Test" after observing the waveform captured by the oscilloscope.

  • Page 35: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual 7.3.2 Test Results Reference  EL_33: Downstream ports start sending an alternating sequence of Chirp K’s and Chirp J’s within 100us after the device Chirp k stops.  EL_34: Downstream port Chirp K and Chirp J durations must be between 40us and 60us duration. The amplitude of Chirp J and Chirp K are measured both in this test.
  • Page 36 USB 2.0 Electrical Compliance Test User Manual  EL_35: Downstream ports must begin sending SOF’s no sooner than 100us and no later than 500us from transmission of the last Chirp (J or K). int.siglent.com...
  • Page 37 USB 2.0 Electrical Compliance Test User Manual int.siglent.com...

  • Page 38: High-Speed Ds Suspend Resume (El_38 El_39, El_41)

    USB 2.0 Electrical Compliance Test User Manual High-Speed DS Suspend Resume (EL_38 EL_39, EL_41) 7.4.1 Test Steps 7.4.1.1 Test Environment Setup D+、D- A. J29 and J28 are test points for D+ and D- signals respectively. B. The host under test is accessed in J33 and a USB 2.0 certified high-speed device is accessed in J32.
  • Page 39 USB 2.0 Electrical Compliance Test User Manual 7.4.1.2 HSETT Sending Packet Setup 7.4.1.2.1 Suspend Sending Packet Setup If you are using HSETT software, please follow the instructions in the following steps to send packets. If you are sending packets by yourself, please click "Run Test" after observing the waveform captured by the oscilloscope.
  • Page 40 USB 2.0 Electrical Compliance Test User Manual waveforms differ greatly from the reference waveforms, please check if the wiring is correct and start from step A again. 7.4.1.2.2 Resume Sending Packet Setup If you are using HSETT software, please follow the instructions in the following steps to send packets. If you are sending packets by yourself, please click "Run Test"...

  • Page 41: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual 7.4.2 Test Results Reference  EL_38: The device must revert to full-speed no later than 125us after there is a 3ms idle period on the bus (3.000ms <= t <= 3.125ms). Measure the time interval from the last SOF's of High- Speed to suspend.

  • Page 42: High-Speed Ds Not Driven Voltage Levels (El_8, El_9)

    USB 2.0 Electrical Compliance Test User Manual High-Speed DS Not Driven Voltage Levels (EL_8, EL_9) 7.5.1 Test Steps 7.5.1.1 Test Environment Setup A. Use two SMA cables to connect J41 and J42 to the previously configured D+ and D- channels. B.
  • Page 43 USB 2.0 Electrical Compliance Test User Manual completed and the waveforms received by the oscilloscope are observed, click "Run Test", the oscilloscope will complete the signal analysis. 7.5.1.2 HSETT Sending Packet Setup 7.5.1.2.1 TEST_J Sending Packets Setup If you are using HSETT software, please follow the instructions in the following steps to send packets. If you are sending packets by yourself, please click "Run Test"...
  • Page 44 USB 2.0 Electrical Compliance Test User Manual does not capture the waveform, or D+ is not high level, D- is not low level, please check whether the wiring is correct, check whether [TEST_J] is selected in Port Control, and then click [EXECUTE] to restart the test.

  • Page 45: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual Select [TEST_SE0_NAK] in Port Control, and enter the number of the test port of the device under test in Port. Click [EXECUTE]. After observing the waveform captured by the oscilloscope, click "Run Test". If the oscilloscope does not capture the waveform, or D+ and D- are not low level, please check if the wiring is correct, and check if [TEST_SE0_NAK] is selected in Port Control, and then click [EXECUTE] to restart the test after confirming that there is no error.

  • Page 46: Full-Speed Ds Signal Quality

    USB 2.0 Electrical Compliance Test User Manual Full-Speed DS Signal Quality 7.6.1 Test Steps D+、D- int.siglent.com...

  • Page 47: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual A. J29 and J28 are test points for D+ and D- signals respectively. B. J33 is connected to the host under test via a 5m USB cable. C. J32 is connected to the full-speed hub as well as four high-speed hubs according to the wiring diagram, where the full-speed hubs are connected to J32 with a short cable, and the rest are connected with 5m cables;...

  • Page 48: Low-Speed Ds Signal Quality

    USB 2.0 Electrical Compliance Test User Manual Low-Speed DS Signal Quality 7.7.1 Test Steps D+、D- int.siglent.com...

  • Page 49: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual A. J29 and J28 are test points for D+ and D- signals respectively. B. J33 is connected to the host under test. C. J32 access to certified low-speed devices. D. Click the "Run Test" button in the "Run Test" column, the oscilloscope will automatically complete the test.

  • Page 50: Drop

    USB 2.0 Electrical Compliance Test User Manual Drop 7.8.1 Test Steps 7.8.1.1 Test Environment Setup VBUS A. J30 is the VBus test point, connect the probe according to the configured oscilloscope channel. B. The host port under test is connected to J33 of the signal board through a 1m cable, J32 is connected to the load board through a short cable, and the rest of the ports are connected to the load board through 1m cables.

  • Page 51: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual 7.8.2 Test Results Reference The VBus voltage of the port under test is 4.75V~5.25V for all ports of the host with no load connected, and 4.75V~5.25V for all ports with 500mA load connected, respectively. Droop 7.9.1 Test Steps...
  • Page 52 USB 2.0 Electrical Compliance Test User Manual int.siglent.com...

  • Page 53: Device

    USB 2.0 Electrical Compliance Test User Manual Device When performing USB 2.0 device-related tests, please set up the compliance test function correctly according to the test requirements. High-Speed US Signal Quality (EL_2, EL_4/EL_5, EL_6, EL_7) 8.1.1 Test Steps A. Use two SMA cables to connect J8 and J7 to the configured D+ and D- channels. J13 establishes communication with the oscilloscope through the cables, and the Power light on.
  • Page 54 USB 2.0 Electrical Compliance Test User Manual specified in the appropriate eye pattern template which is less than 50mV. All of the above test items are performed together, with specific waveforms captured before near- end/far-end eye chart analysis. int.siglent.com...

  • Page 55: High-Speed Us Packet Parameters (El_21, El_22, El_25)

    USB 2.0 Electrical Compliance Test User Manual High-Speed US Packet Parameters (EL_21, EL_22, EL_25) 8.2.1 Test Steps D+、D- A. For "Single Ended", J4 and J3 are the test points for D+ and D- signals respectively, and for "Differential Probe", the test point is J1. J13 establishes communication with the oscilloscope through the cable, and the Power light lights up.
  • Page 56 USB 2.0 Electrical Compliance Test User Manual  EL_22: When transmitting after receiving a packet, hosts and devices must provide an inter- packet gap of at least 8 bit times and not more than 192 bit times(16.64ns~399.36ns). The oscilloscope displays two packets, measuring the time interval between the first packet (sent by the host) and the second packet (replied by the device).

  • Page 57: High-Speed Us Chirp Timing (El_28, El_29, El_31)

    USB 2.0 Electrical Compliance Test User Manual High-Speed US Chirp Timing (EL_28, EL_29, EL_31) 8.3.1 Test Steps D+、D- A. J4 and J3 are the test points for D+ and D- signals, respectively. J13 establishes communication with the oscilloscope through the cable, and the Power light is on. B.

  • Page 58: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual C. Click the "Run Test" button in the "Run Test" column, the Init light will go out and the Test light will go on, the oscilloscope will automatically complete the test, and the test results will be popped up at the end of the test.

  • Page 59: High-Speed Us Suspend Resume (El_38 El_39, El_40 El_41)

    USB 2.0 Electrical Compliance Test User Manual High-Speed US Suspend Resume (EL_38 EL_39, EL_40 EL_41) 8.4.1 Test Steps D+、D- A. J4 and J3 are the test points for D+ and D- signals respectively, connect the probes according to the configured oscilloscope channel; J13 establishes communication with the oscilloscope through the cable, and the Power light is on.

  • Page 60: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual not on, please re-plug the DUT. C. Click the "Run Test" button in the "Run Test" column, the Init light will go out and the Test light will go on, the oscilloscope will automatically complete the test, and the test results will pop up after the test is finished.

  • Page 61: High-Speed To Reset (El_27, El_29, El_31)

    USB 2.0 Electrical Compliance Test User Manual High-Speed to Reset (EL_27, EL_29, EL_31) 8.5.1 Test Steps D+、D- A. J4 and J3 are the test points for D+ and D- signals respectively, connect the probes according to the configured oscilloscope channel; J13 establishes communication with the oscilloscope through the cable, and the Power light is on.

  • Page 62: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual not on, please re-plug the DUT. C. Click the "Run Test" button in the "Run Test" column, the Init light will go out and the Test light will go on, the oscilloscope will automatically complete the test, and the test results will pop up after the test is finished.
  • Page 63 USB 2.0 Electrical Compliance Test User Manual produced by the device.  EL_31: During device speed detection, when a device detects a valid K-J-K-J-K-J sequence, the device must disconnect its 1.5K pull-up resistor and enable it high-speed termination within 500us. int.siglent.com...

  • Page 64: Suspend To Reset (El_28, El_29, El_31)

    USB 2.0 Electrical Compliance Test User Manual Suspend to Reset (EL_28, EL_29, EL_31) 8.6.1 Test Steps D+、D- A. J4 and J3 are the test points for D+ and D- signals respectively. J13 establishes communication with the oscilloscope through the cable and the Power light is on. B.

  • Page 65: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual C. Click the "Run Test" button in the "Run Test" column, the Init light will go out and the Test light will go on, the oscilloscope will automatically complete the test, and the test results will pop up after the test is finished.
  • Page 66 USB 2.0 Electrical Compliance Test User Manual  EL_31: During device speed detection, when a device detects a valid K-J-K-J-K-J sequence, the device must disconnect its 1.5K pull-up resistor and enable it high-speed termination within 500us. int.siglent.com...

  • Page 67: High-Speed Us Not Driven Voltage Levels (El_8, El_9)

    USB 2.0 Electrical Compliance Test User Manual High-Speed US Not Driven Voltage Levels (EL_8, EL_9) 8.7.1 Test Steps A. Use two SMA cables to connect J8 and J7 to the configured D+ and D- channels. J13 establishes communication with the oscilloscope through the cables and the Power light is on. B.

  • Page 68: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual 8.7.2 Test Results Reference  EL_8: The voltage measured of J/K not driven should be 360mV to 440mV. Voltage of J when the upstream is not driven Voltage of K when the upstream is not driven ...

  • Page 69: Full-Speed Us Signal Quality

    USB 2.0 Electrical Compliance Test User Manual Voltage of SE0_NAK in upstream Full-Speed US Signal Quality 8.8.1 Test Steps TriggerD+、 D+、D- A. J46 and J45 are the D+ and D- signal test points of the DUT respectively, and J29 is the signal test point for trigger D+.

  • Page 70: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual cable, and any other port is connected to J33 through a short cable. D. The J10 and HS Hub 4 upstream ports are connected to the full-speed hub, as well as three high- speed hubs according to the wiring diagram, all using 5m cables.

  • Page 71: Low-Speed Us Signal Quality

    USB 2.0 Electrical Compliance Test User Manual Low-Speed US Signal Quality 8.9.1 Test Steps TriggerD-、 D+、D- A. J46 and J45 are the D+ and D- signal test points of the DUT respectively, and J28 is the signal test point for trigger D+. B.

  • Page 72: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual E. J32 is connected to a low-speed device that has passed the official USB certification, J51 is connected to the DUT, and S2 is dialed to "Device ON". When performing this test, please try to connect all self-powered hubs to an external power supply to avoid the test failing due to insufficient power supply to the multi-stage hub connections under bus power.

  • Page 73: Back Voltage

    USB 2.0 Electrical Compliance Test User Manual 8.10 Back Voltage 8.10.1 Test Steps 8.10.1.1 Test Environment Setup A. In the figure, J11 and J12 are VBus, D-, D+, and GND from left to right, connect the probe according to the configured VBus, D-, and D+ channels. B.

  • Page 74: 8.11 Inrush

    USB 2.0 Electrical Compliance Test User Manual 8.10.1.2 Voltage Test before Enumeration If the device is self-powered, please connect it to an external power source, connect the DUT to the J10 port, and click "Run Test". 8.10.1.3 Voltage Test after Enumeration If the device is a self-powered, please connect it to an external power source, connect the DUT to any normal USB port, make it enumerate normally, connect the DUT to J10, and click "Run Test".

  • Page 75: Test Results Reference

    USB 2.0 Electrical Compliance Test User Manual probe's degaussing. C. J51 access to the DUT, S2 twist switch to "Device ON", check whether the oscilloscope waveform is upward, if not, it means that the probe is connected incorrectly, please flip the probe and then access to J50.
  • Page 76 USB 2.0 Electrical Compliance Test User Manual int.siglent.com...

  • Page 77: Hub Downstream Facing Port

    USB 2.0 Electrical Compliance Test User Manual Hub Downstream Facing Port When performing USB 2.0 hub downstream facing port-related tests, please set up the compliance test function correctly according to the test requirements. High-Speed DS Signal Quality (EL_2, EL_6, EL_7, EL_47) 9.1.1 Test Steps A.
  • Page 78 USB 2.0 Electrical Compliance Test User Manual int.siglent.com...

  • Page 79: High-Speed Ds Packet Parameters (El_21, El_22, El_23, El_25, El_55)

    USB 2.0 Electrical Compliance Test User Manual High-Speed DS Packet Parameters (EL_21, EL_22, EL_23, EL_25, EL_55) 9.2.1 Test Steps D+、D- A. For "Single Ended ", J29 and J28 are the test points for D+ and D- signals respectively, and for "Differential Probe", the test point is J27.
  • Page 80 USB 2.0 Electrical Compliance Test User Manual  EL_22: When transmitting after receiving a packet, hosts and devices must provide an inter- packet gap of at least 8 bit times and not more than 192 bit times. Measure the time interval between the first packet (sent by the hub downstream port) and the second packet (replied by the device).
  • Page 81 USB 2.0 Electrical Compliance Test User Manual  EL_25: The EOP for all transmitters’ packets (except SOFs) must be an 8 bit NRZ byte of 01111111.  EL_55: Hosts transmitting SOF packets must provide a 40 bit EOP without bit stuffing. Measure the number of EOP bits for SOF's packets sent from the downstream port of the hub, the test metric is greater than 40bit.
  • Page 82 USB 2.0 Electrical Compliance Test User Manual High-Speed DS Chirp Timing (EL_33, EL_34, EL_35) 9.3.1 Test Steps D+、D- A. J29 and J28 are the test points for D+ and D- signals, respectively. Connect the oscilloscope and probe according to the configuration of the oscilloscope channel. B.
  • Page 83 USB 2.0 Electrical Compliance Test User Manual C. The upstream port of the hub is connected to J10, if the enumeration is successful, the Init light will be on, otherwise, please re-plug it. The downstream port of the hub under test is connected to J33 using a short cable, and a high-speed device certified by USB 2.0 is accessed at J32.
  • Page 84 USB 2.0 Electrical Compliance Test User Manual  EL_35: Downstream ports must begin sending SOF’s no sooner than 100us and no later than 500us from transmission of the last Chirp (J or K). int.siglent.com...
  • Page 85 USB 2.0 Electrical Compliance Test User Manual High-Speed DS Suspend Resume (EL_38 EL_39, EL_41) 9.4.1 Test Steps D+、D- A. J29 and J28 are test points for D+ and D- signals, respectively. B. Use the cable to connect the oscilloscope USB interface and J13 to establish communication between the oscilloscope and the USB signal board, and the Power light is on.
  • Page 86 USB 2.0 Electrical Compliance Test User Manual  EL_41: After resuming a port, the host must begin sending SOF’s within 3ms of the start of the idle state. int.siglent.com...
  • Page 87 USB 2.0 Electrical Compliance Test User Manual High-Speed DS Not Driven Voltage Levels (EL_8, EL_9) 9.5.1 Test Steps A. Use two SMA cables to connect J41 and J42 to the configured D+ and D- channels. B. Use the cable to connect the oscilloscope USB interface and J13 to establish communication between the oscilloscope and the USB signal board, and the Power light is on.
  • Page 88 USB 2.0 Electrical Compliance Test User Manual  EL_9: When either D+ or D- is not being driven, the output voltage must be 0V±20mV when terminated with precision 45 ohm resistors to ground. This item measures the D+ and D- voltage values in the SE0 state.
  • Page 89 USB 2.0 Electrical Compliance Test User Manual High-Speed DS Repeater (EL_42, EL_43, EL_44, EL_45, EL_48) 9.6.1 Test Steps A. When using differential probes, J1 corresponds to the repeater upstream test point and J27 corresponds to the repeater downstream test point; when using single-ended probes, J4 and J3 correspond to the D+ and D- of the repeater upstream test point, and J29 and J28 correspond to the D+ and D- of the repeater downstream test point;...
  • Page 90 USB 2.0 Electrical Compliance Test User Manual the downstream port of a packet that passes through the hub; the difference between the two must not be greater than 4 bits.  EL_43: Hubs must no corrupt any repeater bits of the SYNC field. Measure the SYNC field at the downstream port of the hub, test metric >= 12bit.
  • Page 91 USB 2.0 Electrical Compliance Test User Manual  EL_45: A hub must not corrupt any of the valid EOP bits when repeating a packet. Measure the EOP of the downstream port of the repeater with a test metric >= 8bit. ...
  • Page 92 USB 2.0 Electrical Compliance Test User Manual Full-Speed DS Signal Quality 9.7.1 Test Steps D+、D- A. J29 and J28 are test points for D+ and D- signals respectively. B. Use the cable to connect the oscilloscope USB interface and J13 to establish communication between the oscilloscope and the USB signal board, and the Power light is on.
  • Page 93 USB 2.0 Electrical Compliance Test User Manual When performing this test, please try to connect all self-powered hubs to an external power supply to avoid the test failing due to insufficient power supply to the multi-stage hub connections under bus power. G.
  • Page 94 USB 2.0 Electrical Compliance Test User Manual Low-Speed DS Signal Quality 9.8.1 Test Steps D+、D- A. J29 and J28 are test points for D+ and D- signals, respectively. B. Use the cable to connect the oscilloscope USB interface and J13 to establish communication between the oscilloscope and the USB signal board, and the Power light is on.
  • Page 95 USB 2.0 Electrical Compliance Test User Manual  Measure the EOP width of the low-speed packet, which is required to be in the range of (1.875+1) bit to (2.25+1) bit.  Measure the signal speed of the low-speed packet, and its full-speed signal speed is required to be between 1.4775MHz and 1.5225MHz.
  • Page 96 USB 2.0 Electrical Compliance Test User Manual Drop(Self-Powered) 9.9.1 Test Steps 9.9.1.1 Test Environment Setup VBUS int.siglent.com...
  • Page 97 USB 2.0 Electrical Compliance Test User Manual A. J30 is the voltage test point for the port VBus under test, connect the probe according to the channel configured before. B. The hub's port under test is connected to J33 of the signal board via a 1m cable, J32 is connected to the load board via a short cable, and the rest of the ports are connected to the load board via 1m cables.
  • Page 98 USB 2.0 Electrical Compliance Test User Manual A. J23 is the hub upstream port VBus test point and J30 is the hub downstream port VBus test point, connect the probes according to the channels configured before. B. Find a normally powered host that is connected to signal board J25, the hub upstream port is connected to signal board J24, and the S3 twister switch on the signal board is toggled to the Init position with the host powering the hub.
  • Page 99 USB 2.0 Electrical Compliance Test User Manual C. Use the cable to connect the USB signal board J13 and the oscilloscope, the Power light is on. D. Click the "Run Test" button in the "Run Test" column, check whether the cable connection is the same as the pop-up window, click "OK", the oscilloscope will start to capture waveforms.
  • Page 100 USB 2.0 Electrical Compliance Test User Manual 10 Hub Upstream Facing Port When performing USB 2.0 hub upstream facing port-related tests, please set up the compliance test function correctly according to the test requirements. 10.1 High-Speed US Signal Quality (EL_2, EL_6, EL_7, EL_46) 10.1.1 Test Steps A.
  • Page 101 USB 2.0 Electrical Compliance Test User Manual specified in the appropriate eye pattern template which is less than 50mV. ▶ EL_46: The hub upstream ports are tested using eye diagram template 1, with test point at TP3. All of the above test items are performed together, and perform near-end eye chart analysis after specific waveforms are captured.
  • Page 102 USB 2.0 Electrical Compliance Test User Manual 10.2 High-Speed US Packet Parameters (EL_21, EL_22, EL_25) 10.2.1 Test Steps D+、D- A. For "Single Ended", J4 and J3 are the test points for D+ and D- signals respectively, and for "Differential Probe", the test point is J1. J13 establishes communication with the oscilloscope through the cable, and the Power light is on.
  • Page 103 USB 2.0 Electrical Compliance Test User Manual  EL_22: When transmitting after receiving a packet, hosts and devices must provide an inter- packet gap of at least 8 bit times and not more than 192 bit times(16.64ns~399.36ns). The oscilloscope displays two packets, measuring the time interval between the first packet (sent by the host) and the second packet (sent by the device).
  • Page 104 USB 2.0 Electrical Compliance Test User Manual 10.3 High-Speed US Chirp Timing (EL_28, EL_29, EL_31) 10.3.1 Test Steps D+、D- A. J4 and J3 are the test points for D+ and D- signals respectively. J13 establishes communication with the oscilloscope through the cable and the Power light is on. int.siglent.com...
  • Page 105 USB 2.0 Electrical Compliance Test User Manual B. Access the upstream port of the hub under test in J10, if it is successfully enumerated, the Init light will be on, if the Init light is not on, please re-plug the hub under test. C.
  • Page 106 USB 2.0 Electrical Compliance Test User Manual device must disconnect its 1.5K pull-up resistor and enable it high-speed termination within 500us. 10.4 High-Speed US Suspend Resume (EL_38 EL_39, EL_40 EL_41) 10.4.1 Test Steps A. J4 and J3 are the test points for D+ and D- signals respectively, connect the probes according to the configured oscilloscope channel;...
  • Page 107 USB 2.0 Electrical Compliance Test User Manual B. Access the upstream port of the hub under test in J10, if it is successfully enumerated, the Init light will be on, if the Init light is not on, please re-plug the hub under test. C.
  • Page 108 USB 2.0 Electrical Compliance Test User Manual 10.5 High-Speed to Reset (EL_27, EL_29, EL_31) 10.5.1 Test Steps A. J4 and J3 are the test points for D+ and D- signals respectively, connect the probes according to the configured oscilloscope channel; J13 establishes communication with the oscilloscope through the cable, and the Power light is on.
  • Page 109 USB 2.0 Electrical Compliance Test User Manual light will be on, if the Init light is not on, please re-plug the hub under test. C. Click the "Run Test" button in the "Run Test" column, the Init light will go out and the Test light will go on, the oscilloscope will automatically complete the test, and the test results will pop up after the test is finished.
  • Page 110 USB 2.0 Electrical Compliance Test User Manual produced by the device.  EL_31: During device speed detection, when a device detects a valid K-J-K-J-K-J sequence, the device must disconnect its 1.5K pull-up resistor and enable it high-speed termination within 500us. int.siglent.com...
  • Page 111 USB 2.0 Electrical Compliance Test User Manual 10.6 Suspend to Reset (EL_28, EL_29, EL_31) 10.6.1 Test Steps A. J4 and J3 are the test points for D+ and D- signals respectively, connect the probes according to the configured oscilloscope channel; J13 establishes communication with the oscilloscope through the cable, and the Power light is on.
  • Page 112 USB 2.0 Electrical Compliance Test User Manual light will be on, if the Init light is not on, please re-plug the hub under test. C. Click the "Run Test" button in the "Run Test" column, the Init light will go out and the Test light will go on, the oscilloscope will automatically complete the test, and the test results will pop up after the test is finished.
  • Page 113 USB 2.0 Electrical Compliance Test User Manual  EL_31: During device speed detection, when a device detects a valid K-J-K-J-K-J sequence, the device must disconnect its 1.5K pull-up resistor and enable it high-speed termination within 500us. int.siglent.com...
  • Page 114 USB 2.0 Electrical Compliance Test User Manual 10.7 High-Speed US Not Driven Voltage Levels (EL_8, EL_9) 10.7.1 Test Steps A. Use two SMA cables to connect J8 and J7 to the D+ and D- channels configured before. J13 establishes communication with the oscilloscope through the cables and the Power light is on. B.
  • Page 115 USB 2.0 Electrical Compliance Test User Manual 10.7.2 Test Results Reference  EL_8: The voltage measured of J/K not driven should be 360mV to 440mV. Voltage of J when the upstream is not driven Voltage of K when the upstream is not driven ...
  • Page 116 USB 2.0 Electrical Compliance Test User Manual Voltage of SE0_NAK in upstream 10.8 High-Speed US Repeater (EL_42, EL_43, EL_44, EL_45, EL_48) 10.8.1 Test Steps A. When using differential probes, J1 corresponds to the repeater upstream test point and J27 int.siglent.com...
  • Page 117 USB 2.0 Electrical Compliance Test User Manual corresponds to the repeater downstream test point; when using single-ended probes, J4 and J3 correspond to the D+ and D- of the repeater upstream test point, and J29 and J28 correspond to the D+ and D- of the repeater downstream test point; connect the probes in accordance with the previous oscilloscope channel configuration.
  • Page 118 USB 2.0 Electrical Compliance Test User Manual  EL_44: A hub may add at most 4 random bits to the end of the EOP field when repeating a packet. Measure the difference between the number of downstream port EOP bits and the number of upstream port EOP bits of a packet after it passes through the hub, which must not increase by more than 4 bits.
  • Page 119 USB 2.0 Electrical Compliance Test User Manual  ▶ EL_48: A hub repeater may not delay packets for more than 36bit time plus 4ns. The delay is measured from the beginning of the end of the hub's input data SYNC field to the end of the output data SYNC field up to the end of the output data SYNC field, and the time interval between the two cannot exceed 36 bits + 4ns.
  • Page 120 USB 2.0 Electrical Compliance Test User Manual 10.9 Full-Speed US Signal Quality 10.9.1 Test Steps TriggerD+、 D+、D- A. J46 and J45 are the D+ and D- signal test points of the DUT respectively, and J29 is the signal test point for trigger D+. B.
  • Page 121 USB 2.0 Electrical Compliance Test User Manual bit to (2.1+1) bit.  Measure the voltage amplitude of D+ and D- cross point, the cross point voltage is required to be between 1.3V and 2V.  Measure the signal speed of the full-speed packet, which is required to be between 11.97 MHz and 12.03MHz.
  • Page 122 USB 2.0 Electrical Compliance Test User Manual 10.10 Back Voltage 10.10.1 Test Steps 10.10.1.1 Test Environment Setup A. In the figure, J11 and J12 are VBus, D-, D+, and GND from left to right, so connect the probe according to the configured VBus, D-, and D+ channels. B.
  • Page 123 USB 2.0 Electrical Compliance Test User Manual 10.11 Inrush 10.11.1 Test Steps 10.11.1.1 Test Environment Setup A. Choose any normally powered USB port and connect it to J52 via a cable, and J50 connects to the current probe. B. After connecting the current probe, open the previously configured oscilloscope test channel, manually configure the current probe multiplier of the channel according to the probe used, set the channel setting to "200mA/div", select "Auto"...
  • Page 124 USB 2.0 Electrical Compliance Test User Manual and then unplug the DUT. B. S2 twist switch to "Device ON". C. Access the DUT at J51, observe the waveform captured by the oscilloscope and click "Run Test", if the waveform captured by the oscilloscope differs greatly from the following reference waveform, please check whether the wiring is correct and restart from step A.
  • Page 125 We firmly believe that today SIGLENT is the best value in electronic test & measurement. Headquarters: SIGLENT Technologies Co., Ltd Add: Bldg No.4 & No.5, Antongda Industrial Zone, 3rd Liuxian Road, Bao'an District, Shenzhen, 518101, China...

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