HSIC Essentials
Electrical Validation and Protocol Decode Solution
Measurements and Setup Library
Methods of Implementation (MOI)
Version 1.0
Technical Reference
077-0779-00
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Revision History
Version
Issue Date
Pages
Nature of Change
0.1
23 Jul 2012
All
Initial draft version
0.7
27 Sep 2012
All
Added setup files info
0.8
9 Oct 2012
All
Updated with figures.
measurements
0.9
11th Oct 2012
All
Incorporated the review
comments
1.0
18
th
Oct 2012
All
Updated version.
Methods of Implementation
Added Host
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Contents
1 Introduction to the DPOJET HSIC Essentials Setup Library ............................................................................................ 1
2 Assumptions ................................................................................................................................................................... 1
3 Equipment Requirements .............................................................................................................................................. 2
4 Accessing the DPOJET HSIC Essentials Measurement Menu ......................................................................................... 3
4.1 HSIC Essentials Measurement Setup Library ................................................................................................................. 3
4.2 Specification Test Points and Measurement Setup Library ........................................................................................... 4
5 Preparing to Take Measurements .................................................................................................................................. 6
5.1 Initial Oscilloscope Setup ............................................................................................................................................... 6
5.2 Installation ...................................................................................................................................................................... 6
6 HSIC Test Procedure ....................................................................................................................................................... 7
6.1 Step-by-Step HSIC Device testing ................................................................................................................................... 7
6.2 Step-by-Step HSIC HOST testing ................................................................................................................................... 13
6.3 Bus Timing Measurements ........................................................................................................................................... 15
7 HSIC Essentials Protocol Decoding ............................................................................................................................... 19
7.1 Installation .................................................................................................................................................................... 19
7.2 Performing Protocol Decode ........................................................................................................................................ 19
7.3 HSIC Host and Device Traffic Distinction ...................................................................................................................... 23
8 Measurement Methodologies ..................................................................................................................................... 25
8.1 High-Low ...................................................................................................................................................................... 25
8.2 Eye Width ..................................................................................................................................................................... 25
8.3 Eye Height .................................................................................................................................................................... 25
8.4 Rise Slew Rate .............................................................................................................................................................. 26
8.5 Fall Slew Rate ............................................................................................................................................................... 26
8.6 Setup ............................................................................................................................................................................ 27
8.7 Hold .............................................................................................................................................................................. 27
8.8 Frequency ..................................................................................................................................................................... 28
8.9 Mask Hits ...................................................................................................................................................................... 28
Appendix ............................................................................................................................................................................... 29
Configuring the DPOJET HSIC Essentials for additional debug analysis and customization of various measurements ..... 29
iv HSIC Essentials MOI
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Supported Specification Title
Specifications Revision
HSIC Essentials MOI Test Points
Defined
Universal Serial Bus Specification
Rev 2.0
High-Speed Inter-Chip USB Electrical
Specification
Ver 1.0
HSIC ECN
Rev 1.0
1 Introduction to the DPOJET HSIC Essentials Setup Library
This document provides the Methods of Implementation (MOI) for performing HSIC transmitter
measurements and HSIC Protocol Decoding with Tektronix MSO/DPO5000, DPO7000C,
MSO/DPO/DSA70000C/D Win7 64-bit oscilloscopes enabled with option DJA (DPOJET Advanced Jitter
and Eye Analysis Tool), and option HSIC. The oscilloscope should have a bandwidth of at least 2 GHz.
Instrument Setup files using DPOJET base measurements are use d to perform HSIC specific measurements.
DPOJET along with its associated setup files provides tran s mitter path measurements (am p litu d e, timing,
and jitter), waveform mask testing and limit testing described in the specifications at respective host/device
test points.
Table 1 HSIC specifications
Device and Host
In the subsequent sections, step-by-step procedures are described to help you perform HSIC measurements.
Each measurement is described as a Method of Implementation (MOI).
For the latest version of this document and the latest HSIC Setup Library, refer to www.tek.com/downloads
(keyword ‘HSIC Essentials’).
For further details on HSIC test specifications and compliance testing requirements, you can refer to
specification documents available on www.usb.org
website.
2 Assumptions
The procedures explained in this document assume that the user will have control of the Device Under Test
(DUT) configuration such that the DUT will be able to output the required signal for the testing. The
procedures also assume that user has configuration control of the voltage swing in environments where the
device supports multiple voltage classes.
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Oscilloscope
Software Options
Probes
Accessories
MSO5204
Opt. HSIC
Qty. 2 TAP1500
DPO7254C
Qty. 2 TAP1500 or P6245
MS0/DPO/DSA70000C/D
Qty. 2 P6245 (requires 2
ships with oscilloscope)
3 Equipment Requirements
HSIC Essentials is supported on Tektronix MSO/DPO5000, DPO7000C, MSO/DPO/DSA70000C/D Win7
64-bit oscilloscopes. The following table outlines the equipment requirements for each of these oscilloscope
families.
Table 2 List of Equipment
DPO5204
Opt. DJA
PPM100 Probe Holders
DPO7354C
TCA-BNC Adapters. 1
Oscilloscope firmware: Tek S cope firmware version 6.4.0 or later.
Application Framework: Option DJA: DPOJET Advanced Jitter and Eye Analysis Tool application
version 6.0.0 and above.
Application Software: Option HSIC Essentials – Electrical Validation and Protocol Decode Solution
(requires DJA). HSIC Essentials software installer includes setup libraries for transmitter measurements
and protocol decoder support. Opt. HSIC license key enables setup libraries for transmitter
measurements.
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4 Accessing the DPOJET HSIC Essentials Measurement Menu
On the oscilloscope TekScope menu, go to Analyze -> HSIC Essentials, and click on it to invoke the HSIC
setup library in DPOJET standards tab. Refer to Figure 1.
Figure 1 DPOJET Analyze Menu
4.1 HSIC Essentials Measurement Setup Library
IMPORTANT: Each Setup file is defined with the absolute file paths of the Masks and Limit files used for
the respective tests. All Setup files must be in the proper file path locations for correct operation.
The HSIC Measurement Setup Library consists of the following software file types.
HSIC Setup Files
Setup File Library File Path: C:\Users\Public\Tektronix\TekApplications\HSIC\Setups
Description: The HSIC folder contains setup files for the standard. Setup files are available for each group
of measurements. Refer to Table 3 of this document for further description.
Saved Setups have been created by using the Save -> Setup function of the supported oscilloscopes. If any
changes are made to the Setup file it is recommended you re-save the modified setup file using the Save ->
Setup feature of TekScope. Please save them with a different name to avoid writing over the parameters in
the factory default distribution files.
HSIC Waveform Masks
Mask Library File Path: C:\Users\Public\Tektronix\TekApplications\HSIC\Masks
Description: The HSIC Mask library contains the waveform mask files used by various setup files.
Waveform masks are used to perform Pass/Fail eye diagram template testing on the waveform.
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Option HSIC-Setup file Name
Section
Symbol(s)
HSIC
name
Measurement Method
Section 4
VDD
Voltage
High-Low
T
slew
DATA
RiseSlewRate_Data
T
slew
DATA
FallSlewRate_Data
Ts
Setup Time
Setup
Ts
Hold Time
Hold
F
strobe
Frequency
Frequency
T
slew
STROBE
RiseSlewRate_Strobe
T
slew
STROBE
FallSlewRate_Strobe
Section 7.1.2.2
EyeHeight
EyeWidth
EyeMaskHits
HSIC Limits Files
Limit Library File Path: C:\Users\Public\Tektronix\TekApplications\HSIC\Limits
Description: The HSIC Limits library contains the measurement limit files used by the various se tup files.
Measurement limits are used to provide Pass/Fail indication for each measurement.
4.2 Specification Test Points and Measurement Setup Library
Test Point Definitions:
Figure 2 Location of HSIC Test Points
The following table describes the setup file names, supported HSIC test names and corresponding DPOJET
base measurements as defined at each test point in the Specification. The limits for these measurements are
given in Table 4 of this document.
Table 3 List of measurements supported in Option HSIC Essentials
DeviceSignalQualityNearEnd,
DeviceSignalQualityFarEnd,
HostSignalQualityNearEnd,
HostSignalQualityFarEnd
Specification Reference
HSIC spec –
HSIC
Specification -
Specification Parameter/Test
HSIC signaling
Rise Slew Rate
Fall Slew Rate
Receiver Data
Receiver Data
STROBE
Rise Slew Rate
Fall Slew Rate
Option HSIC - DPOJET Base
USB2 Spec –
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The other setup files available in the library include:
DevicePacketParams
DeviceSuspend
DeviceResume
DeviceResetFromSuspend
DeviceResetFromHS
HostPacketParams
HostSOF_EOP
HostSuspend
HostResume
HostResetFromSuspend
HostResetFromHS
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5 Preparing to Take Measurements
5.1 Initial Oscilloscope Setup
Connect the oscilloscope to the DUT by using the proper probes for the test. Connect Ch1 to Data and Ch2
to Strobe. Press the DEFAULT SETUP button on the oscilloscope front panel, and turn on Ch1 and Ch2 on
the oscilloscope to view the incoming signals on the oscilloscope screen.
Figure 3 below details the connections at the various HSIC test points.
Figure 3 Example Schematic Diagram for a HSIC Device
5.2 Installation
To install HSIC Essentials, , click on the setup.exe present in the Option HSIC installer distribution. After
installation, launch TekScope and the HSIC Essentials package is ready to use.
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6 HSIC Test Procedure
This section provides the Methods of Implementation (MOIs) for Transmitter tests using Tektronix real-time
oscilloscope, probes, and the HSIC DPOJET module.
Note: It is important that th er e ar e pr obing test points (data and clock) laid out for probing to test this
interface. The test points need to be as close to the transmit ter and/ or the rece iver as possible to minimize
the reflections obser ved in the testing of this interface. The reflections will be more pronounced when
performing the packet parameter testing and should not impact the ability to make the measurements. In
addition, it is important that the test points be of equal length from the transmitter or receiver to ensure
accurate setup and hold measurements.
6.1 Step-by-Step HSIC Device testing
6.1.1 Signal Quality Tests
Scope Setup:
• Connect Ch1 to Data
• Connect Ch2 to Strobe
1. Launch HSIC Essentials from the Analyze menu.
2. In the Standard tab of DPOJET, click on the Setup button.
3. Load setup file – DeviceSignalQualityNearEnd.set.
4. Configure the DUT to send out the USB Test Packet. This can done using the HSET (High Speed
Electrical Too l) provided by USB-IF. This setup file can also be used on live traffic.
Figure 4 Signal Quality
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Test
Min
Nominal
Max
High-Low Voltage
1.1 V
1.2 V
1.3 V
Rise Skew rate
0.7 V/ns
2 V/ns
Low Skew Rate
–2 V/ns
–0.7 V/ns
Frequency
239.88 MHz
240 MHz
240.12 MHz
Rx Setup and Hold
365 ps
Rx Setup and Hold
365 ps
Eye Mask Hits
Mask File Name:
SignalQuality_NearEnd
5. After the setup has been completed, click on the single button in DPOJET. The waveform captured will
be as shown in Figure 4.
6. DPOJET automatically selects the limit file based on the test point. The Pass/Fail status is shown in the
DPOJET Results tab. Refer to Figure 5. The limits are shown in Table 4 below.
Table 4 Device/Host Signal Quality Pass / Fail Limits
SignalQuality_FarEnd OR
Figure 5 Device Signal Quality Measurement Result
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7. Select the Reports button in the DPOJET menu.
8. Press the ‘Save As’ button and enter the report name.
9. The Report is as shown in Figure 6.
Figure 6 Device Signal Quality Measurement Report
6.1.2 Packet Parameter Test
Packet Parameters consist of the following tests:
• Sync Field – All transmitte d packets (not repeated packets) must begin with a 32 bit SYNC field.
• Inter-packet gap – 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. Hosts transmitting 2 packets in a row
must have an inter-packet gap of at least 88 bit times and not more than 192 bit times.
• EOP – The EOP for all transmitting packets (except SOFs) must be an 8 bit NRZ byte of 01111111
without bit stuf f ing.
All limits for these measurements are taken from USB 2.0 Specification.
Scope Setup:
• Connect Ch1 to Data
1. Launch HSIC Essentials from the Analyze menu.
2. In the Standard tab of DPOJET, click on the Setup button.
3. Load setup file – DevicePacketParams.set.
4. Set trigger to single, then set device to produce the single step set signal. This can done using the HSET
(High Speed Electrical Tool) provided by USB-IF. This setup file can also be used on live traffic.
5. The waveform should have 3 bursts of data, similar to Figure 7 below.
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Figure 7 Packet Parameter Test – Inter Packet Gap
6. Turn on the Cursors. Click on Cursors menu and select Cursors On. Ensure that the Cursor Type is set to
V Bars. Refer to Figure 8.
Figure 8 Using cursors
7. Turn on the Zoom feature of the TekScope. Select a region of interest using the mouse to bring up a
menu and choose Zoom1 On. Refer to Figure 9.
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Figure 9 Using zoom feature
8. Turn on the Decode feature. See Section7 of this document for details on setting up the decoder. Ch1
and Ch2 must be turned ‘ON’ for decoding.
6.1.2.1 Inter Packet Gap Measurement
1. For devices, this measurement should be made between the second and third burst.
2. Zoom in on the gap between the second and third packet and use the cursors to measure the time
between bursts. Place ‘Cursor a’ at the end of 2
nd
burst and ‘Cursor b’ at the beginning of the 3rd burst.
∆Τ value shows the time between the 2 Cursors ‘a’ and ‘b’. Refer to Figure 7 above.
3. The limits, for this measurement to Pass, are between 16.64 ns and 39.94 ms.
6.1.2.2 Sync Field Measurement
1. For devices, this measurement should be made on the third burst.
2. Zoom in on the third packet and use the cursors to measure the sync field. Place ‘Cursor a’ at the
beginning of 3
rd
burst and ‘Cursor b’ at the end of Sync field (shows up if the Protocol Decode Bus in
turned ‘ON’. See Section 7 of this document for details on setting up the decoder. Ch1 and Ch2 must be
turned ‘ON’ for decoding.). Refer to Figure 10.
3. The limits, for this measurement to Pass, are between 65.5 ns and 67.7 ns.
Figure 10 Packet Parameter Test – Sync Field
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6.1.2.3 EOP Measurement
1. This measurement is to be done on the third burst. Place ‘Cursor a’ at the beginning of EOP region of
rd
the 3
burst and ‘Cursor b’ at the end. Refer to Figure 11.
2. The limits, for this measurement to Pass, are between 14.5 ns and 18.75 ns.
Figure 11 Packet Parameter Test – EOP
Arm the single sequence trigger and forcing the second step of the single step feature to send data from the
host; the device should send a response. The waveform should look similar to Figure 12.
6.1.2.4 Second Inter Packet Gap measurement
1. The gap between the two packets needs to be measured.
2. Use the cursors to measure the gap. Place ‘Cursor a’ at the end of 1
beginning of the 2
nd
burst. ∆Τ value shows the time between the 2 Cursors ‘a’ and ‘b’. Refer to Figure
st
burst and ‘Cursor b’ at the
12.
3. The limits, for the measurement to Pass, are between 16.64 ns and 39.94 ms.
Figure 12 Packet Parameter Test – Inter Packet Gap
In the Reports tab, Press the ‘Save As’ button and enter the report name. Or press ‘Append’ to append to the
previously saved test report. Screenshots of the zoomed screen will be available in the report.
Alternately, a screenshot can also be saved using the ‘Save As’ Screen Capture feature of the TekScope.
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6.2 Step-by-Step HSIC HOST testing
6.2.1 Signal Quality Test
Scope Setup:
• Connect Ch1 to Data
• Connect Ch2 to Strobe
1. Launch HSIC Essentials from the Analyze menu.
2. In Standards tab of DPOJET, Click on the Setup button.
3. Load setup file – HostSignalQualityNearEnd.set.
4. Configure the DUT to send out the USB Test Packet. This can done using the HSET (High Speed
Electrical Tool) provided by USB-IF. This setup file can also be used on live traffic. The waveform is
similar to the device signal quality.
5. Place Cursors on either side of the center data packet as shown in Figure 13. Click on the Single button
in DPOJET.
6. DPOJET automatically selects the limit file based on the test point with limit values as defined in Table
4 above. The Pass/Fail status is shown in the DPOJET Results tab.
7. Select the Reports button in the DPOJET menu.
8. Press the ‘Save As’ button and enter the report name. Or press ‘Append’ to append to the previously
saved test report.
Figure 13 Host Signal Quality
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6.2.2 Packet Parameter Test
Scope Setup:
• Connect Ch1 to Data
1. Launch HSIC Essentials from the Analyze menu.
2. In the Standard tab of DPOJET, Click on the Setup button.
3. Load setup file – HostPacketParams.set.
4. Set trigger to single, then set device to produce the single step get dev desc signal. This can done using
the HSET (High Speed Electrical Tool) provided by USB-IF. This setup file can also be used on live
traffic.
Note: Refer to Section 7.3 on how to distinguish between Host and Device traffic in an acquired signal.
5. The waveform should have 3 bursts of data.
6. Turn on the Decode feature. See Section 7 of this document for details on setting up the decoder. Ch1
and Ch2 must be turned ‘ON’ for decoding.
6.2.2.1 Sync Field Measurement
1. For hosts, this measurement should be made on the first and second burst.
2. Use the cursors to measure the gap. Place ‘Cursor a’ at the beginning and ‘Cursor b’ at the end of the
Sync field. ∆Τ value shows the time between the 2 Cursors ‘a’ and ‘b’. Refer to Figure 10.
3. Limits for this measurement to have a Pass result are between 65.5 ns and 67.7 ns
6.2.2.2 EOP Measurement
1. For Hosts, this measurement is to be done on the second burst.
2. Use the cursors to measure the gap. Place ‘Cursor a’ at the beginning and ‘Cursor b’ at the end of EOP
region of the 2
nd
burst. Refer to Figure 11.
3. Limits for this measurement to have a Pass result are between 14.5 ns and 18.75 ns.
6.2.2.3 Inter packet Gap
1. For Hosts, this measurement should be made on the first and second burst.
2. Use the cursors to measure the gap. Place ‘Cursor a’ at the end of 1
beginning of the 2
nd
burst. ∆Τ value shows the time between the 2 Cursors ‘a’ and ‘b’.
st
burst and ‘Cursor b’ at the
3. Limits for this measurement to have a Pass result are between 18.3 n s and 39.94 ms.
Arm the single sequence trigger and forcing the second step of the single st ep get dev desc feature. The
waveform should have 3 bursts.
6.2.2.4 Second Inter Packet Gap measurement
1. The gap between the second and third packets needs to be measured.
2. Use the cursors to measure the gap. Place ‘Cursor a’ at the end of 2nd burst and ‘Cursor b’ at the
beginning of the 3rd burst. ∆Τ value shows the time between the 2 Cursors ‘a’ and ‘b’.
3. Use the cursors to measure the gap. The limits for a Pass result are between 16.64 ns and 39.94 ms.
6.2.2.5 SOF EOP measurement
1. Launch HSIC Essentials from the Analyze menu.
2. In the Standard tab of DPOJET, Click on the Setup button.
3. Load setup file – HostSOF_EOP.set.
4. Set trigger to Single, this measurement measures the EOP width of the SOF packet.
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STROBE
DATA
Description
IDLE
Hi
Lo
1 or more Strobe Periods
CONNECT
Lo
Hi
2 Strobe Periods
RESUME
Lo
Hi
For time periods per USB 2.0 SPEC
SUSPEND
Hi
Lo
Per USB 2.0 SPEC
RESET
Lo
Lo
Per USB2.0 SPEC
5. Use the cursors to measure the gap. Place ‘Cursor a’ at the beginning and ‘Cursor b’ at the end of EOP
region.
6. The limit for a Pass result is 83.32 ns.
6.3 Bus Timing Measurements
Given below is the table from High-Speed Int er-Chip USB Electrical Specification. Note from the table tha t
the both Strobe and Data are low during Reset.
Table 5 Bus State Signaling
The tests mentioned below are easier to measure with the HSIC Decode feature. See Section 7 of this
document for details on setting up the decoder.
6.3.1 Suspend Test
Scope Setup:
• Connect Ch1 to Data
• Channel Ch2 to Strobe
1. Launch HSIC Essentials from the Analyze menu.
2. In the Standard tab of DPOJET, Click on the Setup button.
3. Load setup file – DeviceSuspend.set.
4. Set trigger to Single on the scope and configure the DUT to send out the Suspend signal. This can done
using the HSET (High Speed Electrical Tool) provided by USB-IF. This setup file can also be used on
live traffic.
5. The waveform should look like Figure 14.
6. Once the Idle is found Suspend should last for at least 3 ms. Use Cursors to measure the time duration.
Figure 14 Suspend test
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6.3.2 Resume Test
Scope Setup
• Connect Data Signal to Ch1.
• Connect Strobe signal to Ch2.
1. Launch HSIC Essentials from the Analyze menu.
2. In the Standard tab of DPOJET, Click on the Setup button.
3. Set the device to suspend mode.
4. Load setup file – DeviceResume.set.
5. Set trigger to single, then set device to produce Resume signal. This can done using the HSET (High
Speed Electric a l Too l) provided by USB-IF. This setup file can also be used on live traffic.
6. Place the Cursors and measure the time duration for which the strobe signal is low, as shown in Figure
15.
7. The measured time duration should be at least 20 ms for a pass.
Figure 15 Resume Signal. Strobe Signal (Ch2) in Blue
6.3.3 Reset From Suspend
Scope Setup
• Connect Data Signal to Ch1.
• Connect Strobe signal to Ch2.
1. Launch HSIC Essentials from the Analyze menu.
2. In the Standard tab of DPOJET, Click on the Setup button.
3. Set the device to suspend mode.
4. Load setup file – DeviceResetFromSuspend.set.
5. Set trigger to single, and then reset the device (either a soft or hard reset). This can done using the HSET
(High Speed Electrical Tool) provided by USB-IF. This setup file can also be used on live traffic
6. The waveform should look like Figure 16.
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7. Both strobe and Data lines should be Low for a Pass, after the suspend region. It should last for at least
2.5 µs.
Figure 16 Reset From Suspend
6.3.4 Reset From High Speed
Scope Setup
• Connect Data Signal to Ch1.
• Connect Strobe signal to Ch2.
1. Launch HSIC Essentials from the Analyze menu.
2. In the Standardtab of DPOJET, Click on the Setup button.
3. Load setup file – DeviceResetFromHS.set.
4. Set the device to High Speed Mode – for example configure to send a Test Packet.
5. Set trigger to single, and then reset the device (either a soft or hard reset). This can done using the HSET
(High Speed Electrical Tool) provided by USB-IF. This setup file can also be used on live traffic.
6. The waveform should look like Figure 17.
7. Both strobe and Data lines should be Low for a Pass, following the High speed region. Reset should last
for at least 3.1 ms.
Figure 17 Reset from High Speed
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NOTE: The Bus Timing measurements are similar even for HSIC Host. Please load the corresponding
HOST setup file and continue with the measurements as described in the Section 7.3.
A measurement (frequency) is added in Device/HostPacketParams. set and in a ll setup files mentioned in
Section 6.3. This measurement is a report only measurement. Adding this measurement will enable to
save/append the report.
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7 HSIC Essentials Protocol Decoding
7.1 Installation
To install HSIC Essentials, click on the setup.exe present in the Option HSIC installer distribution. After
installation, launch TekScope and the HSIC Decoder package is ready to use.
7.2 Performing Protocol Decode
Click on the Tekscope Vertical menu or Digital Menu (available only on MSO scopes) and go to Bus Setup
as shown in the figure below.
Figure 18 Launching Bus Setup from Vertical Menu
In the Config pane, Choose Serial option and select Custom from the dropdown. Once HSIC is chosen in the
Custom Decoder drop down, the threshold has to be set manually based on the incoming signal. Both Ch1
and Ch2 must be turned ON.
After configuring, turn Bus1 On by clicking the button under the Bus 1 label. The decode d packet s are
displayed on the scope graticule.
Note: If decoded packets are not displayed, please verify threshold settings.
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Figure 19 Enabling HSIC Decoder
The Display tab provides an option to select Busform and Waveform. The Protocol Decode Event Table
showing the list of decoded packets can be viewed by clicking the button under the Protocol Decode Event
Table label.
Click on the Export button to export the packets to the .csv format.
The Protocol Decode Event Table can also be accessed from the Tekscope Analyze menu by selecting
Analyze->Results Table.
HSIC decoder provides the Search feature. Once a HSIC bus has been created, search can be done on the
various packet Fields. Search can be invoked from the Analyze menu as shown in Figure 20.
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Figure 20 Invoking Search
Click on Bus in the Search->Select Tab to get the search options defined for HSIC. Refer to Figure 21.
Figure 21 Search->Select Tab
Click on the Configure Tab. Choose from the list of options in the Search For drop down menu. Refer to
Figure 22.
Figure 22 Search For options for HSIC Decoder
Choose Data to search on the Data field of the packet. The Data format can be either Hex or Binary. Enter
the Data Value and Click On. The Search hits are highlighted on the search graticule as in Figure 23.
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Figure 23 Search Hits
The Results tab shows the list of search hits. Click on the item in the list to go to the specific field on the
scope graticule. Refer to Figure 24.
Figure 24 Results: Mark Table
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7.3 HSIC Host and Device Traffic Distinct ion
HSIC Protocol Decoder can be used to distinguish between HOST and Device traffic. Token packets (such
as IN, OUT, SETUP) are always issued by USB HSIC hosts. By reading these Token packets through HSIC
Protocol Decoder, one would be able to distinguish a Host signal from a Device.
Procedure to identify a HOST packet
1. Launch HSIC Essentials from the Analyze menu.
2. In the Standard tab of DPOJET, Click on the Setup button.
3. Load setup file – DevicePacketParams.set.
4. Turn on Ch1 and Ch2.
5. Configure the bus as shown in section 7.2 – “Performing Protocol Decode”
6. Go to the Analyze menu and choose Search.
7. In the Configure tab choose Search For PID
8. Select any of one these options -IN, OUT, SETUP from the PID Dropdown. Refer to Figure 25.
Figure 25 Configure tab – Choose PID option
9. Go to Mode tab. Check “Stop Acquisition if event found” option. Refer to Figure 26.
Figure 26 Search-Mode tab to Stop Acquisition when a PID event occurs
10. Click on the Run/Stop Button on the oscilloscope front panel.
11. The acquisition will stop when the selected PID event occurs indicating a Host signal capture. Refer to
Figure 27.
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Figure 27 PID Out Event indicating a Host signal has triggered an Acquisition Stop
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8 Measurement Methodologies
8.1 High-Low
The High–Low measurement calculates the change in voltage level across a transition in the waveform.
The application calculates the Hig h –Low using the following equation:
() =
()
( + 1)
Where:
HIGH-LOW is the high-low amplitude measurement result.
V
n is the index of a selected transition.
i is the index of the UI (bit) location preceding the transition.
i+1 is the index of the UI (bit) location following the transition.
V
LEVEL = OP[vPERCENT(i)] is the state level of the unit interval (bit period).
OP[• ] is the selected Operation (either Mean or Mode).
v
PERCENT is the set of voltage samples over the selected portion (percent) of the unit interval, ranging
from 1% to 100%.
NOTE. If there are no waveform samples that fall within the identified percentage of the unit interval, the
single nearest waveform sample preceding the center point of the unit interval will be used.
8.2 Eye Width
The Eye Width measurement is the measured minimum horizontal eye opening at the zero reference level.
The application calculates this measurement using the following equation:
Where:
=
UI
is the average UI.
AVG
TIE
is the Peak-Peak TIE.
pk-pk
8.3 Eye Height
The Eye Height measurement is the measured minimum vertical eye opening at the UI center as shown in
the plot of the eye diagram. There are three types of Eye Height values.
Eye Height
The application calculates this measurement using the following equation:
=
Where:
EYE-HI-MIN is the minimum of the High voltage at mid UI.
V
V
EYE-LO-MAX is the maximum of the Low voltage at mid UI.
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Eye Height-Transition
The application calculates this measurement using the following equation:
=
Where:
EYE-HI-TRAN-MIN is the minimum of the High transition bit eye voltage at mid UI.
V
V
EYE-LO-TRAN-MAX is the maximum of the Low transition bit eye voltage at mid UI.
Eye Height-Non-Transition
The application calculates this measurement using the following equation:
=
Where:
EYE-HI-NTRAN-MIN is the minimum of the High non- transition bit eye voltage at mid UI.
V
V
EYE-LO-NTRAN-MAX is the maximum of the Low non-transition bit eye voltage at mid UI.
8.4 Rise Slew Rate
The Rise Slew Rate is defined as the rate of change of the voltage between the cro s sing s of the specifie d
VREFHI and VREFLO reference voltage levels. The voltage difference is measured between the VREFHI
reference level crossing and the VREFLO reference level crossing on the rising edge of the waveform. The
time difference is measured as the difference between the low time, and the low time at which VREFLO and
VREFHI are crossed. The Rise Slew Rate algorithm uses the high and low rise reference voltage levels to
configure the values. Each edge is defined by the slope, voltage reference level (threshold), and the
hysteresis.
The application calculates this measurement using the following equation:
TR
=
V
8.5 Fall Slew Rate
The Fall Slew Rate is defined as the rate of change of the voltage at the specified VREFLO and VREFH I
reference voltage levels. The voltage difference is measured between the VREFLO reference level crossing
and the VREFHI reference level crossing on the falling edge of the waveform. The time difference is
measured as the difference between the high time and low time at which VREFHI and VREFLO are crossed.
The Fall Slew Rate algorithm uses the low time and high fall reference voltage levels to configure the
values. Each edge is defined by the slope, voltage reference level (threshold), and the hysteresis.
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Methods of Implementation
The application calculates this measurement using the following equation:
=
V
TF
8.6 Setup
The Setup Time measurement is the elapsed time between the designated edge of a data waveform and when
the clock waveform crosses its own voltage reference level. The closest data edge to the clock edge tha t f al ls
within the range limits is used.
The application calculates this measurement using the following equation:
=
Where:
Setup is the setup time.
T
T
Main is the Main input (clock) VRefMidMain crossing time in the specified direction.
T
2nd is the 2nd input (data) VRefMid2nd crossing time in the specified direction.
8.7 Hold
The Hold Time measurement is the elapsed time between when the clock waveform crosses its own voltage
reference level and the designated edge of a data waveform. The closest data edge to the clock edge that falls
within the range limits is used.
The application calculates this measurement using the following equation:
=
Where:
Hold is the hold time.
T
T
Main is the Main input (clock) VRefMidMain crossi ng time in the specified direction.
T
2nd is the 2nd input (data) VRefMid2nd crossing time in the specified direction.
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Methods of Implementation
8.8 Frequency
The Frequency measurement calculates the inverse of the data period for each cycle.
If the Signal Type is Clock, the application calculates clock frequency measurement using the following
equation:
=
1
Where:
is the clock frequency.
F
Clock
P
is the clock period measurement.
Clock
If the Signal Type is Data, the application calculates data frequency measurement using the following
equation:
=
1
Where:
is the data frequency.
F
Data
P
is the data period measurement.
Data
8.9 Mask Hits
The Mask Hits measurement reports the number of unit intervals in the acquisition for which mask hits
occurred, for a user-specified mask. In the Results Summary view, the Mask Hits measurement reports the
total number of unit intervals for which a mask hit occurred in at least one mask zone. In the Results Details
view, the number of hits in each of three segments is reported. The population field shows the total number
of unit intervals measured.
The Mask Hits measurement has several unique properties:
• Unlike other measurements, it requires a Mask hits plot. Adding a Mask Hits measurement will cause
the corresponding plot to be created automatically. If you delete a Mask Hits plot, the application will
remove the corresponding Mask Hits measurement after verifying the action with you.
• The Mask Hits measurement does not support the Worst-Case Waveforms logging feature.
• The Mask Hits measurement does not support Measurement Range Limits.
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Appendix
Configuring the DPOJET HSIC Essentials for additional debug analysis and customization of various measurements
On the oscilloscope TekScope menu, go to Analyze > HSIC Essentials, and click on it to invoke the HSIC
setup library in DPOJET standards tab as shown in Figure 28 below.
Selecting Measurements
Ensure that HSIC is selected in the standard drop-down list and then click on the Setup button. You select
either a single measurement or recall a setup file to run multiple measurements at a time. Recalling a predefined setup file loads all the required setup configurations for each test/measurements supported for the
setup file.
Figure 28 HSIC Standard option in DPOJET standard menu
Each of the measurements listed under HSIC Standards tab can be selected manually by clicking on them. If
the measurements are used without the pre-defined setup files, please follow these instructions to configure
the oscilloscope setup.
Selecting Limit Files
If a measurement has a pass/fail limit associated with it in the test point file, go to Analyze -> Jitter and Eye
Analysis -> Limits to select the limit file from the folder where the limit files are saved. Measurements with
pass/fail limits will show up in the Results Summary panel when the compliance test is run.
Configure Mask file:
In the DPOJET application go to ‘Plots’ if you want to enable the Mask file.
1. Select measurement from the measurement column.
2. Click ‘Configure’ to change the default setup for that measurement. The mask selection window opens
as shown:
3. In the Mask file selection window, press the ‘Off’ button first and then click ‘Browse’ to select the Mask
file.
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Figure 29 Selecting a Mask File
4. Select the relevant mask file (for example, SignalQuality_Nearend.msk) and click ‘Open’.
5. Enable the file by selecting the ‘On’ button, and click OK.
Configuring Source of Waveforms
The selection options are:
• Live/Ref/Math source selec tion (us es sing le ended signal as data and clock source)
• Live channel selections–Ch1, Ch2, Ch3, Ch4
• Reference waveform selections–Ref1, Ref2, Ref3, Ref4
Horizontal Setup
1. Go to the 'Horiz/Acq'-> 'Horizontal /A cquisition Setup' and Change the 'Record Length' and ‘Sample
Rate’ to the required value.
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Figure 30 Horizontal/Acquisition Setup
The horizontal parameters are set in the setup files to acquire the correct signal for various tests.
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