Teledyne USB-PD TDMP Manuel utilisateur

USB-PD TDMP

Trigger, Decode,

Measure/Graph, and

Physical Layer Tests

USB-PD TDMP Instruction Manual

Users are permitted to duplicate and distribute Teledyne LeCroy, Inc. documentation for internal educational purposes only.

Resale or unauthorized duplication of Teledyne LeCroy publications is strictly prohibited.

Teledyne LeCroy is a trademark of Teledyne LeCroy, Inc., Inc. Other product or brand names are trademarks or requested

trademarks of their respective holders. Information in this publication supersedes all earlier versions. Specifications are

subject to change without notice.

November, 2022

usb-pd-tdmp-im-eng_01nov22.pdf

Contents

Introducing USB-PD TD and TDMP 1

Serial Decode 2

Decoding Workflow 3

Decoder Set Up 3

Setting Level and Hysteresis 7

Failure to Decode 8

Serial Decode Dialog 8

Reading Waveform Annotations 9

Serial Decode Result Table 10

Searching Decoded Waveforms 16

Decoding in Sequence Mode 17

Improving Decoder Performance 18

Serial Trigger 19

Requirements 19

Restrictions 19

USB-PD Trigger Setup 19

Linking Trigger and Decoder 21

Using the Decoder with the Trigger 21

Saving Trigger Data 22

Measure/Graph 23

Serial Data Measurements 23

Graphing Measurements 24

Measure/Graph Setup Dialog 24

Filtering Measurements 25

USB-PD Physical Layer Testing 27

Configure Tests 27

USB-PD Eye Diagrams 28

Appendix A: Automating the Decoder 30

Configuring the Decoder 30

Accessing the Result Table 30

Reading the Structure of the Result Table 30

Modifying the Result Table 32

Technical Support 33

USB-PD TDMP Instruction Manual

About This Manual

This manual explains the basic procedures for using serial data trigger and decode software options for Teledyne

LeCroy oscilloscopes. It is assumed that you have a basic understanding of the serial data physical layer

specifications, and how to use the oscilloscope on which the option is installed. Only features specific to this product

are explained in this manual.

While some images may not exactly match what is on your oscilloscope display—or may show an example taken

from another standard—be assured that the functionality is identical. Product-specific exceptions will be noted in the

text.

Some capabilities described may only be available with the latest version of our MAUI®software. Updates are

available from the software download page at teledynelecroy.com under Oscilloscope Downloads > Firmware

Upgrades.

Introducing USB-PD TD and TDMP

The Teledyne LeCroy USB-PD options apply software algorithms to extract USB power delivery information from

physical layer waveforms measured on your oscilloscope. The extracted information is displayed over the actual

physical layer waveforms, color-coded to provide fast, intuitive understanding of the relationship between message

frames and other, time synchronous events.

The trigger and decode (-TD) option enables you to trigger the oscilloscope acquisition upon finding specific

message frames, data patterns, or errors in serial data streams. Conditional filtering at different levels enables you to

target the trigger to a single message or a range of matching data.

The -TDMP option adds a set of measurements designed for serial data analysis, as well as physical layer tests

defined by the standard. The physical layer tests are based on the decoder results and may be viewed along side the

decoding. See Measuring for instructions on using the serial data measure and graphing capabilities. See USB-PD

Physical Layer Tests for eye diagramming and PHY measurements.

Note: If you have installed other -DME or -TDME options, the dialogs for Measure/Graph and Eye Diagram

creation will appear when the decoder is open. They may or may not appear "grayed out." We do not

guarantee the correct operation of the functionality unless it is explicitly supported by the installation of a

TDMP option for this protocol.

Note: DMP/TDMP options with physical-layer tests will often have more eye diagram selections in the PHY

tests found on the Analysis menu.

USB-PD TDMP Instruction Manual

Serial Decode

The methods described here at a high level are used by all Teledyne LeCroy serial decoders, differing only slightly for

signals with an embedded clock and separate clock and data signals.

Bit-level Decoding

The first software algorithm examines the embedded clock based on a default or user- specified vertical threshold

level. Once the clock signal is extracted, the algorithm examines the traffic to determine whether a data bit is high or

low. The default High and Low levels are automatically determined from a measurement of the amplitude of the

signals acquired by the oscilloscope. Alternatively, they can be manually set by the user. The algorithm intelligently

applies a hysteresis to the rising and falling edge of the serial data signal to minimize the chance of perturbations or

ringing on the edge affecting the data bit decoding.

Note: Although the decoding algorithm is based on a clock extraction software algorithm using a vertical

level, the results returned are the same as those from a traditional protocol analyzer using sampling point-

based decode.

Logical Decoding

After determining individual data bit values, another algorithm performs a decoding of the serial data message after

separation of the underlying data bits into logical groups specific to the protocol (Header/ID, Address Labels, Data

Length Codes, Data, CRC, Parity Bits, Start Bits, Stop Bits, Delimiters, Idle Segments, etc.).

Message Decoding

Finally, another algorithm applies a color overlay with annotations to the decoded waveform to mark the transitions

in the signal. Decoded message data is displayed in tabular form below the grid. Various compaction schemes are

utilized to show the data for the duration of the acquisition, from as little as one serial data message acquisition to

many thousands. In the case of long acquisitions, only the most important information is highlighted, whereas with

the shortest acquisition, all information is displayed with additional highlighting of the complete message frame.

User Interaction

Your interaction with the software in many ways mirrors the order of the algorithms. You will:

lAssign a protocol/encoding scheme and input sources to one of the four decoder panels using the Serial Data

and Decode Setup dialogs.

lComplete the remaining subdialogs required by the protocol/encoding scheme.

lWork with the decoded waveform, result table, and measurements to analyze the decoding.

Serial Decode

Decoding Workflow

We recommend the following workflow for effective decoding:

1. Set up the decoder using the lowest level decoding mode available, but do not yet enable it.

2. Acquire at least one complete transmission reasonably well centered on screen in both directions, with

generous idle segments on both sides.

Note: See Failure to Decode for more information about the required acquisition settings.

3. Stop acquisition, then enable the decoder. It will operate on the acquisition in buffer.

4. Use the various decoder tools to verify that transitions are being correctly decoded. Tune the decoder

settings as needed to produce a satisfactory decoding.

5. Once you are correctly decoding in one mode, continue making small acquisitions of five to eight

transmissions and run the decoder in higher level modes.

6. Finally, run the decoder on acquisitions of the desired length.

When you are satisfied the decoder is working properly, you can disable/enable the decoder as desired without

having to repeat this tuning process, provided the basic signal characteristics do not change.

Decoder Set Up

Use the Decode Setup dialog and its protocol-related subdialogs to configure decoders. Each decoder can use

different protocols and data sources, or have other variations, giving you maximum flexibility to compare different

signals or view the same signal from multiple perspectives.

1. Touch the Front Panel Serial Decode button (if available on your oscilloscope), or choose Analysis > Serial

Decode from the oscilloscope menu bar.

2. On the Serial Decode dialog, enable the decoder by checking On next to the decoder number. This may be

done any time, although we recommend having an acquisition in buffer before enabling the decoder.

3. Click the Setup button at the end of the row to open the Decode Setup dialog.

Note: The full configuration can only be made from Decode Setup.

4. Enter the input channels (sources) and select the Protocol to be decoded. This selection will drive the other

fields that appear.

Note: Subdialog selections, such as single-ended or differential probing, may affect the input fields

that appear on the Decode Setup dialog.

5. Define the level of decoding on the subdialogs (see below) to the right of the Decode Setup dialog.

USB-PD TDMP Instruction Manual

USB-PD Decoder Settings

These subdialogs appear when you select Protocol USB-PD.

USB-PD Subdialog

Choose to view decoded data in Hexadecimal or Symbolic format. Selecting Symbolic will change the single Data

column of the result table to two columns for Object and Bit Description, showing the symbolic decoding of the

hexadecimal data.

Select if you wish to Show 4b Symbols.

Select PS_RDY_LEVEL if you wish to measure VBUS @ PS_RDY. If you check this, be sure to specify the input

channel for the VBUS on the main Decode Setup dialog.

Select if you wish to Show VID Name on the decoder annotations.

Levels Subdialog

Enter the High-Low threshold Level as either percent amplitude or absolute voltage. Optionally, you can also set a

Hysteresis to prevent false determinations.

Serial Decode

Measuring VBUS @ PS_RDY

According to the USB-PD specification, the PS_RDY Message shall be sent by the Source (or by both the new Sink

and new Source during the Power Role Swap sequence or Fast Role Swap sequence) to indicate its power supply

has reached the desired operating condition.

Follow these steps to set up the decoder to make the VBUS @ PS_RDY measurement.

1. Probe CC using one channel and VBUS using a second channel. In this example, CC is on C1and VBUS is on

C2, which are entered in the corresponding fields on the Decode Setup dialog.

2. On the USB-PD subdialog, select the PS_RDY_LEVEL checkbox.

3. You can optionally also trigger on the PS_RDY Message by selecting it from the Trigger dialog. In this case,

the oscilloscope will trigger on the first instance of PS_RDY in the USB-PD stream, placing it at the top of the

decoder result table.

USB-PD TDMP Instruction Manual

Following acquisition, the oscilloscope will display a decoding similar to that below:

For each instance of PS_RDY decoded on the CC1/CC2 channel, the measured voltage on the VBUS channel is

recorded in the PS_RDY_LEVEL column of the decoder result table:

The VBUS @ PS_RDY voltage also appears on the waveform in the MsgType = PS_RDY field annotation when the

trace is expanded.

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