Tektronix DPO70404, DPO70604, DPO70804, DSA70404, DSA70604 User manual

Technical Reference

RT-Eye® Serial Data Compliance and Analysis
Standards Support Library
Methods of Implementation (MOI)
071-2387-00

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Methods of Implementation

Table of Contents

1 Introduction to the RT-Eye Standards Support Library ......................2

2 Connecting to the Device Under Test (DUT)...........................................3

2.1 SMA Connection to the DUT....................................................................3

2.2 ECB probe connection to the DUT...........................................................4

3 Configuring a DUT for Compliance Measurements ..............................5

4 Taking Measurements...............................................................................5

4.1 Initial Oscilloscope Setup..........................................................................5

4.2 Running the RT-Eye Software .................................................................5

4.3 Selecting a Setup File from the Library ..................................................6

4.4 Selecting a Compliance Test Point from the Library.............................6

4.5 Configuring the Probe Type.....................................................................6

4.6 Selecting Autoset........................................................................................7

4.7 Selecting Start and Viewing Test Results................................................7

5 Creating, Saving, and Sharing Reports...................................................8

6 Supported Measurements by Standard...................................................8

6.1 DisplayPort.................................................................................................9

6.2 Fibre Channel ..........................................................................................11

6.3 Ethernet (XAUI and 10GBaseCX4).......................................................14

6.4 InfiniBand DDR (Dual Data Rate) and QDR (Quad Data Rate) ........15

6.5 Open Base Station Architecture Initiative (OBSAI) ............................16

6.6 Serial Attached SCSI (SAS)....................................................................17

6.7 Serial RapidIO.........................................................................................18

7 Appendix A - Customizing Standards Support Library Files.............19

7.1 Customizing Setup Files..........................................................................19

7.2 Customizing Mask Files..........................................................................19

7.3 Customizing Limits Files.........................................................................20

8 Appendix B – Measurement Algorithms...............................................20

RT-Eye Standards Support Library 1

Methods of Implementation

1 Introduction to the RT-Eye Standards Support Library

This document provides the procedures for making high speed serial standard measurements with Tektronix
TDS/CSA7000, DSA/DPO70000 and TDS6000 series real time oscilloscopes and probing solutions. The
Serial Analysis module in RT-Eye provides clock recovery, eye diagram, amplitude, and jitter measurements
found in most high speed serial data specifications. The Serial Analysis module also supports waveform
mask testing and measurement limit testing with Pass/Fail indication. Pass/Fail criteria for the signal under
test is called out in the electrical specifications of industry standards.

The Standards Support Library consists of a library of setup folders under the File > Recall selection from
the RT-Eye menu. The library of setup files provides testing for the following standards:

• DisplayPort

• FibreChannel

• Ethernet (XAUI and 10GBaseCX4)

• InfiniBand (DDR and QDR)

• OBSAI (Open Base Station Architecture Initiative)

• SAS (Serial Attached SCSI)

• Serial RapidIO

The setup files are consistent with the ‘compliance points’ called out in the standards. The proper waveform
mask (.msk) and measurement limits (.lim) file are recalled as part of the setup file. Once the file is recalled,
Pass/Fail testing on the signal under test can be completed by simply pressing Autoset and Run from the
RT-Eye menu.

2 RT-Eye Standards Support Library

Methods of Implementation

2 Connecting to the Device Under Test (DUT)

There are four fundamental probing techniques to perform standards-based ‘compliance’ measurements
using the Standards Support Library. These probing techniques are described below. Probe configurations A
and C represent the Probe Type: Single Ended in the RT-Eye Measurement Select Menu. This is the
default configuration of the setup files in the library. The probe type can be changed to
Probe Type: Differential if a differential probing solution (Probe configuration B or D) is used.

2.1 SMA Connection to the DUT

A. Two TCA-SMA inputs using SMA

cables (Ch1) and (Ch3)

The differential signal is created by
the RT-Eye SW from the math
waveform Ch1-Ch3. The Common
mode AC measurement is also
available in this configuration from
the common mode waveform
(Ch1+Ch3)/2. This probing
technique requires breaking the link
and terminating into the 50 Ω/side
termination into the oscilloscope.
Ch-Ch deskew is required using this
technique because two channels are
used.

Probe Configuration A

B. One P7350SMA differen tial active

probe (Ch1)

The differential signal is measured
across the termination resistors
inside the P7350SMA probe. This
probing technique requires breaking
the link. Matched cables are
provided with the P7350 probe to
avoid introducing de-skew into the
system. Only one channel of the
oscilloscope is used.

SMA Psuedo-differential

Probe Configuration B

SMA Input Differential Probe

RT-Eye Standards Support Library 3

Methods of Implementation

2.2 ECB probe connection to the DUT

C. Two single ended active probes

(Ch1) and (Ch3)

The differential signal is created by
the RT-Eye SW from the math
waveform Ch1-Ch3. The Common
mode AC measurement is also
available in this configuration from
the common mode waveform
(Ch1+Ch3)/2. This probing
technique can be used for either a
live link that is transmitting data, or
a link terminated into a “dummy
load”. In both cases, the single
ended signals should be probed as
close as possible to the termination
resistors on both sides with the
shortest ground connection possible.
Ch-Ch deskew is required using this
technique because two channels are
used.

D. One Differential probe

The differential signal is measured
directly across the termination
resistors. This probing technique
can be used for either a live link that
is transmitting data, or a link
terminated into a “dummy load.” In
both cases, the signals should be
probed as close as possible to the
termination resistors. A single
channel of the oscilloscope is used,
so de-skew is not necessary. Two
differential probes can be used to
create the probing configuration
shown in configuration “C” above.

Probe Configuration C

Two Single Ended Active Probes

Probe Configuration D

One Differential Active Probe

4 RT-Eye Standards Support Library

Methods of Implementation

3 Configuring a DUT for Compliance Measurements

To perform measurements to an industry standard, the device under test must be placed in a state where the
device is transmitting the specification compliant test pattern. Mechanisms for this are standard specific.
Refer to details in the specifications on which patterns are to be used. To ensure that a measurement can be
displayed with multiple patterns, the Standards Support Library setup files use the RT-Eye ‘Arbitrary
Pattern’ method. This can be changed to the ‘Repeating Pattern’ method if desired by the user. To insure
accurate jitter measurements, it’s recommended that 100 repeats of the pattern under test be captured in the
acquisition. The record length may need to be increased to capture enough repeats for accurate and
repeatable measurements regardless of which jitter method is used.

4 Taking Measurements

4.1 Initial Oscilloscope Setup

After connecting the DUT by following the proper probing configuration for the test, click DEFAULT
SETUP.

4.2 Running the RT-Eye Software

On non-B or non-C model oscilloscopes (Example: TDS6604), go to File > Run Application > RT-Eye
Serial Compliance and Analysis
RT-Eye Serial Compliance and Analysis. On DPO/DSA70000 series, go to Analysis > RT- Eye Serial
Compliance and Analysis. When the RT-Eye Wizard dialog appears, select Cancel. The RT-Eye menu

will appear.

Figure 1 – Default menu of the RT-Eye software

. For B and C models (Example: TDS7704B, TDS6154C), go to App >

RT-Eye Standards Support Library 5