Agilent Technologies | DisplayPort | Agilent U7232A DisplayPort Electrical Performance Validation

Agilent U7232A DisplayPort Electrical Performance Validation
Agilent U7232A DisplayPort Electrical
Performance Validation and Compliance
Software for Infiniium Series Oscilloscopes
Data Sheet
Verify and debug your DisplayPort
designs more easily
Agilent Technologies U7232A
DisplayPort electrical performance
validation and compliance software
for Infiniium Series oscilloscopes
(see Table 1) provides you with a fast
and easy way to verify and debug
your DisplayPort interface designs
for sink and source ICs, motherboard
systems, computers and graphics
cards. The DisplayPort electrical
test software is designed for use in
DisplayPort Authorized Compliance
Test Houses, so you can confidently
use it to execute DisplayPort electrical
checklist tests as well as employ it
as a development tool. It displays the
measurement data results in a flexible
report format, and the report also
provides a margin analysis that shows
how closely your device passed or
failed each test.
To make measurements with the
U7232A DisplayPort electrical test
software, you may also need the
W2641A DisplayPort TPA fixture for
signal access.
Video Electronics Standards Association
The U7232A DisplayPort electrical test
software performs a wide range of
tests required to meet the DisplayPort
electrical specifications for various
computer system components (sink
and source ICs, motherboard systems,
computers and graphics cards) as
documented in section 3.5.2 and 3.5.3
of the base DisplayPort specification
by VESA1. To introduce a DisplayPort
product to the market, your product
must successfully pass compliance
testing based on the DisplayPort
specification at an approved
DisplayPort test center, and you will
want to have performed the tests
included on the checklist before you
submit your product for full compliance
testing for ultimate confidence and
lowest turnaround time and process
cost. The U7232A software makes it
easier for you to prepare for passing
the certification hurdle for DisplayPort
U7232A saves you time
The U7232A HDMI electrical test
software offers several features to
simplify the validation of DisplayPort
• Full physical layer testing
• Verification of link layer physical
layer control
• Three modes of physical layer test
• Test status tracking
• Measurement process
• Automated scope measurement
• Test results reports with pass/fail
margin analysis
With the DisplayPort electrical test
software, you can use the same
oscilloscope you use for everyday
debugging to perform automated
testing and margin analysis based on
the DisplayPort-specified test checklist.
The U7232A DisplayPort electrical test
software saves you time by setting
the stage for automatic execution of
DisplayPort electrical tests. Part of
the difficulty of performing electrical
tests for DisplayPort is connecting
the oscilloscope to the target device,
configuring the instrument for
measurements, executing the test
procedures, understanding what to
test, and then analyzing the measured
results by comparing them to limits
published in the specification. The
DisplayPort electrical test software
does almost all of this work for you. In
addition, if you discover a problem with
your device, debug tools are available
to aid in root-cause analysis.
The U7232A DisplayPort electrical test
software offers the electrical tests
for the source as well as important
tests for cable and receiver tolerance
testing. The software automatically
configures the oscilloscope for each
test, and it provides an informative
results report that includes margin
analysis indicating how close your
product is to passing or failing that
specification. Clock recovery of each
lane is accomplished according to the
standard by the oscilloscope using
proprietary software techniques.
See Table 2 for a complete list of
the measurements made by the
DisplayPort electrical test software.
Easy test definition
The U7232A DisplayPort electrical
test software extends the ease-of-use
advantages of Agilent’s Infiniium
Series oscilloscopes to testing
DisplayPort designs. The Agilent
automated test engine walks you
quickly through the steps required to
define the device under test, to select
the tests, set up the tests, perform the
tests, and view the test results. You
can pick high-level test parameters
to suit your test process objectives,
and then you can proceed to select a
category of tests all at once, or specify
individual tests. The user interface is
oriented to minimize reconnections,
which saves you time and minimizes
potential for operator error. You can
save tests and configurations as
project files and recall them later for
quick testing and review of previous
test results. Straightforward menus let
you perform tests with a minimum of
mouse clicks.
Test environment setup and test selection
The U7232A now allows you to define
the DUT capability and select test
environment variables to better suit
your testing goals for speed and cost.
The setup process begins with the
Setup entry screen (shown in Figure 1).
This screen enables selection between
standard DisplayPort physical layer
testing and link layer physical state
change validation process. When you
have selected the testing you want to
perform, the setup continues as shown
in Figure 2 with the ‘Start project’
screen where the project information,
device specifics and testing template
can be chosen. The template allows
subsequent setup fields to have
specific default values you have
Figure 1. U7232A DisplayPort test environment setup
Since there is a wide range of setup
configurations allowed for the test
bench and because DisplayPort
devices have a wide range of optional
performance, the U7232A setup
screens enable you to specify this
Figure 2. Configuration template to enable quick selection
of common settings
Test environment setup and test selection (continued)
The U7232A software guides you
through selecting important test
process information. These are briefly
described below.
• Device ID: enter the device name
and other pertinent information.
• Operator ID: for compliance test
houses to identify the operator for
QA process.
• Project ID: for compliance test
houses that identify projects by
number, this enables the report to
carry a key identification number to
a contract.
• Number of channels: you may
choose to test a 1, 2, 4 channel
connection, see Figure 4. (Note:
differential connection allows full
lane selection, while single-ended
can only support testing 1 or 2
lanes.), see Figure 5.
• Oscilloscope connection: this screen
allows you to assign oscilloscope
channels and device lanes to test,
see Figure 8.
For convenience, these parameters can
be saved in a template file. In order
to execute your planned testing, the
test software needs to know what you
want to test and how you want to test.
For instance, you have a source device
and want to test the differential tests
in compliance mode. This information
is conveyed to the user and easily
selected in the test process setup
screen as shown in Figure 3.
• Device type: allows you to select
between cable test, sink test and
source test suite.
• Test type: define whether tests will
be single-ended or differential, see
Figure 3.
• Test mode: select between
compliance conditions and userspecified modes.
• DUT definition: select the
capabilities of the DUT you wish
to test, see Figure 4.
• Test fixture selection: select the
test fixture used, see Figure 5.
• Connection type: single-ended
versus differential connection:
choose between using two
channels of the scope to make a
differential measurement using an
‘A minus B’ technique or by using
a differential probe on each scope
channel for each lane, see Figure 5.
Figure 3. U7232A Test process setup screen: select test objectives and
device and test type
Test mode selection
The U7232A allows you to select
a test mode that suits your goals.
The selection offers the choice of
compliance testing, user-defined
testing and targeted characterization.
The `Compliance conditions
only’ mode is a test process that
is controlled by a configuration
control that is in accordance with
the DisplayPort compliance test
specification. This assures the user
that measurements will only be
performed on those configurations
required to be tested. For instance,
the data eye only need be measured
for 800 mVolt setting, at both bit
rates, with no pre-emphasis; only
those conditions will be used for eye
measurement in the `compliance
conditions only’ mode.
Figure 4. U7232A DUT definition entry in setup
Device definition
Critical information to guide the test
process will be the device capability
information. This is information about
the test device such as the valid
levels, pre-emphasis settings, number
of lanes, bit rates and whether spread
spectrum clocking is enabled or not.
These capabilities are identified in the
DUT definition screen in Figure 4.
Figure 5. U7232A Test connection setup screen
Test mode selection (continued)
For user-defined testing, a similar
configuration control as in ‘Compliance
conditions only’ mode exists, however,
the user is allowed to configure it by
an additional menu called ‘Manage
test plans’ (Figures 6 and 7.) Note the
test setting checkmarks in Figure 7
indicating permutations to be tested.
Note that this allows settings not
formally allowed in the specification
(800 mVolts with 6 dB pre-emphasis
for example). The `Compliance
conditions only’ mode would not
allow this.
The “Targeted characterization” mode
is the standard mode (from version 1.0)
which allows you to focus on specific
device setup and specifically test
that condition. This is useful for
repeatability studies, troubleshooting
and characterization.
Figure 6. U7232A user defined mode enables test plans
Figure 7. U7232A test plan management
Test mode selection (continued)
Figure 8. Test environment setup: lane and oscilloscope assignment screen
Test selection
After defining the test environment
you are presented with only those
tests that are appropriate for the
environment chosen. For instance, if
spread spectrum clocking (SSC), is not
enabled then no SSC tests will appear.
This is the case for pre-emphasis
as well. If your device definition
is one lane only, or your defined
device connection is one lane (one
differential probe or two single-ended
connections) then no inter-pair skew
tests will appear in the test suite. This
dynamic filtering simplifies your job
by ensuring you attempt to test only
what is possible for the DUT and the
connection model you have chosen.
Figure 9. The Agilent automated test framework guides you quickly
through selecting tests and configuring tests, setting up the connection,
running the tests, and viewing the results. You can easily select
individual tests or groups of tests with a mouse-click. You also can
easily see the test status for the device under test.
Configurability and guided connections
The U7232A DisplayPort electrical
test software provides flexibility in
your test setup. It guides you to make
connection changes with hookup
diagrams when the tests you select
require it. For test parameters such as
bandwidth reduction or data channel
selection, you can select appropriate
values. For more critical parameters,
such as mask scaling option or number
of edges for analysis, default values
are tied to the compliance standard;
these values can only be altered in the
debug screen. In Figure 10 you can
see the selection for various U7232A
eye mask test functions. The default
for compliance mode is “Fixed” which
places the mask in the center of the
eye per the DisplayPort compliance
test specification (shown is ‘Find
Margin’ which will find the range of
passing condition).
After you configure the test to meet
your needs, the U7232A user interface
displays the connection screen,
which is specific to the configuration
data you have selected. Figure 11
illustrates the typical connection
guidance provided for differential tests
for a single lane with an “A minus B”
connection type.
Figure 10. The U7232A configuration screen allows you to alter “soft”
parameters for testing to assist in characterization and debug activities.
Figure 11. The final step before test is to illustrate the anticipated connection for
the test.
Margin analysis
In addition to providing you with
measurement results, the U7232A
DisplayPort electrical test software
provides a report format that shows
you not only where your product
passes or fails, but also reports how
close you are to the limits specified for
a particular test assertion. You select
the margin test report parameter,
which means you can specify the
level at which warnings are issued
to alert you to the electrical tests
where your product is operating
close to the official test limit defined
by the DisplayPort compliance test
specification for a given test assertion.
Margin is calculated:
Single-sided specification:
Margin = (ValueSpecification – Valueactual)/ValueSpecification
Double-sided specification:
Margin = lowest of:
(ValueSpecification_High – Valueactual)/RangeSpecification
(ValueSpecification_Low – Valueactual)/RangeSpecification
Eye margin: Another method of
evaluating the eye is provided by
sweeping the eye horizontally with
the specified mask and determining
the last locations on the left and right
portions of the interior eye where
there are no violations in the mask.
The distance from the center mask
location is a measure of design margin
and is reported as eye margin if that
eye mask mode is chosen in the
configuration screen (Eye Diagram
Mask Movement: Find Margin – see
Figure 10 for example.)
Figure 12. The DisplayPort electrical test software results report documents your test,
indicates the pass/fail status, the test specification range, the measured values, and the
Thorough performance reporting
The U7232A DisplayPort compliance
and validation software generates
thorough reports that not only
capture the performance and status
of the device under test, but also the
screen shots of your most significant
measurements for your perusal and
evaluation. The first page of the report
lists equipment and configuration
details required in standard quality
assurance programs. It also provides
a hot-linked results table that will
quickly get you to the measurement
report section of interest.
Figure 13. The U7232A software generates a summary report
where you can see the total test results for your device quickly
and clearly. Additional details are available for each test,
including the test limits, test description, and test results,
including waveforms, if appropriate. In addition, the margin of
the result is indicated to provide further insight.
Figure 14. Summary report detail: The U7232A software’s
summary report provides screen shots of all the measurements
that have been performed. In this figure you can see the dataeye. Observe the clear status and description at the top and the
measurement data just above the eye.
Test status tracking
The U7232A software can keep track
of the status in a test plan either
for `Compliance conditions only’ or
`User defined conditions’ modes and
is visually viewable in the Test run
menu (Figures 15 and 16). In addition,
you can choose to resume testing
the device and the software where it
stopped the time before.
Figure 15. Show test status: test status selected in the ‘Run tests’
Figure 16. Test status tracking: when all tests are complete
there are no entries below ‘Remaining permutations
Cable equalization feature
The U7232A software leverages the
equalization algorithms that were
implemented in HDMI. Though
not required in DisplayPort, these
algorithms can assist in the design
of receiver equalization methods by
comparing against a reference model
of equalization. Equalization models
exist for Cat 2 cable for 2, 5, and 10
meters, assuming standard models of
skin loss. Your own custom models are
possible using the “User-Specified”
equalization mode. Figure 17 illustrates
the performance of a non-equalized
DisplayPort cable versus equalization
for a 5-meter cable.
W2621A DisplayPort test
point adapter
Figure 18. The Agilent W2641A
DisplayPort test point adapter fixture
The W2641A DisplayPort TPA test
fixture simplifies the measurement
process by providing access to
the electrical measurement points
required for compliance tests. It
breaks out the DisplayPort data lanes
to pairs of SMP connectors for highbandwidth probing with either direct
connection to scope channels, or to
InfiniiMax SMA differential probes
through short SMP-to-SMA cables. Of
course, single-ended measurements
are supported as well. To support
DisplayPort AUX channel for device
control, two SMP connectors and
a digital connector allow for direct
connection to the AUX channel lane.
Figure 17. Cable equalization model for
receiver eye or cable analysis. Top: no
equalization. Bottom: 5-meter equalization
model applied.
Measurement requirements
To use the U7232A electrical
performance validation and compliance
software with the Agilent W2641A
DisplayPort TPA fixture, you will need
at least one pair of the four SMP to
SMA cable pairs provided. Use of
differential probe amplifiers (1134A,
1168A, or 1169A) and appropriate SMA
probe heads (N5380A) is optional.
However, if you want connection
simplicity, consider these probes
for one-time setup and complete
characterization for all differential
measurements. If you are not using
the W2641A test fixture, you will
need to select the appropriate probe
head to interface with your fixture. For
instance, if the high speed signals are
only accessible through a terminated
50-ohm transmission line (for testing
silicon devices for example), you will
need to use the E2678A socketed
probe head, the E2677A, or N5381A
solder-in differential probe head for
high impedance probing and select
these in the scope channel setup
You can minimize test time by using
four InfiniiMax probes to measure all
four main link differential data lanes
(Lane0, Lane1, Lane2, Lane3) without
having to reposition or reconnect
probes. To use this capability, select
Connection Type: Differential Probe,
Number of Channels: Four Channels in
the Setup screen.
Oscilloscope compatibility
The U7232A DisplayPort electrical
performance validation and compliance
software is compatible with Agilent
X90000 Series oscilloscopes with
operating software revision 2.50 or
higher, 90000 Series oscilloscopes
with operating software revision 1.1
or higher or the Agilent 80000 Series
oscilloscopes with operating software
revision A.05.40 or higher (Windows®
XP Pro). For oscilloscopes with earlier
software revisions, free upgrade
software is available at http://www.
Tests performed
The U7232A DisplayPort electrical
performance validation and compliance
software performs all the required
tests and many of the informative ones
as listed in the DisplayPort Compliance
Test Specification 1.1 (CTS1.1) as
documented in section 3.5.3 of the
base specification.
Note that the U7232A DisplayPort
test software can make other
measurements not included here, such
as receiver eye measurements and
equalized eye measurements as well
as most of the newly omitted
CTS 1.1 measurements.
Table 1. Recommended oscilloscopes and bandwidth for the DisplayPort 1.1 specification
Agilent oscilloscopes for DisplayPort compliance test*
Suitable oscilloscopes
Recommended new purchase
Oscilloscope bandwidth
DSO90804A or DSA90804A††
8 GHz*
10 GHz†
12 GHz†
13 GHz†
16 GHz
20 GHz
25 GHz
28 GHz
32 GHz
DSO91204A or DSA91204A
DSO91304A or DSA91304A
8 GHz Bandwidth is recommended by the DisplayPort Compliance Test Specification.
The U7232A software will automatically control the bandwidth setting of the oscilloscope if the N5403A noise reduction software is
†† The DSO80000 and DSO90000 Series oscilloscopes are upgradable in bandwidth from 2 to 13 GHz.
DSA models come with jitter and serial data analysis packages.
††† The Infiniium 90000 X-Series oscilloscopes are upgradeable in bandwidth from 16 to 32 GHz
Table 2. DisplayPort electrical tests performed by the U7232A software
Included with
Test ID 3.1
Data eye diagram
Test ID 3.2
Non pre-emphasis level
Test ID 3.3
Pre-emphasis level verification
Test ID 3.4
Inter-pair skew
Test ID 3.5
Intra-pair skew
Test ID 3.6
Differential transition time
Test ID 3.7
Single-ended rise and fall
Test ID 3.8
Overshoot and undershoot
Test ID 3.9
Frequency accuracy
Test ID 3.10
AC common mode noise
Test ID 3.11
Non-ISI jitter measurements
Test ID 3.12
Total jitter measurements
Test ID 3.13
Unit interval
Test ID 3.14
Main link frequency compliance
Test ID 3.15
Spread spectrum modulation
Test ID 3.16
Spread spectrum modulation
Test ID 3.17
Spread spectrum dF/dt
Section 3
* These tests were defined for DisplayPort CTS 1.0 and were informative. They have been deleted
for DisplayPort CTS 1.1
Ordering information
To purchase the U7232A DisplayPort
source compliance test software with
a new or existing Infiniium 90000 or
90000 X-Series oscilloscope, order the
Model number
Oscilloscope (see Table 1)
Option 003
High-speed serial data analysis software
Option 004
EZJit Plus jitter analysis software
10/12-GHz probe amplifiers.
1169A recommended.
4 (optional)
12-GHz SMA probe heads for differential and
single-ended measurements
4 (optional)
U7232A or
DisplayPort test compliance software for
Infiniium Series oscilloscopes
Probe amplifiers
Probe head
4 (optional)
4 (optional)
or you can order an adapter, N5442A with the 1168/1169 amplifiers and N5380A
For physical connection to a
DisplayPort device to perform
tests with the U7232A DisplayPort
compliance test software, order the
Model number
DisplayPort test point access adapter (plug)
SMP to SMA cables (replacement cables)
As needed
Standard connection
For right angle connection (optional)
SMP to SMA cables right angle connector
1, 2 or 4 pairs
Cable plug-in tool (recommended)
Cable removal tool (required for right angle
DisplayPort receptacle test point adapter
(optional) used in cable test or system
1 or 2
(BitifEye Corp).
Measurement and test accessories
To complete your test setup, Agilent
provides a wide range of cables,
adapters, terminations, etc.
Model number
Power splitter, DC to 26.5 GHz, 3.5-mm (f) connectors
Power divider, DC to 26.5 GHz, 3.5-mm (f) connectors
Coaxial attenuator (3, 6, 10, 20 or 30 dB), DC to 18 GHz,
SMA connector
SMA (f - f) adapter, DC to 18 GHz
SMA (m - m) adapter, DC to 18 GHz
Right-angle adapter, SMA (m - m)
Right-angle adapter, SMA (f - m)
SMA tee adapter (m, f, f), DC to 12.4 GHz
SMA (m) to SMA (f) adapter
Cable kit, four 90-cm (36-inch) SMA (m - m) cables
Matched cable pair, two 90-cm (36-inch) SMA (m - m)
cables, propagation delay within 25 ps
SMA (m) 50 Ω termination
SMA push-on adapters from S.M. Electronics (or equivalent)
Related literature
Publication title
Publication type
Publication number
Infiniium DSO90000 and DSA90000 Series
Data sheet
N5394A DVI Electrical Performance Validation
and Compliance Software
Data sheet
N5399A HDMI Electrical Performance Validation
and Compliance Software
Data sheet
N5990 Automation Software
Data sheet
W2641A DisplayPort Test Point Access Adapter
Data sheet
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October 1, 2009
© Agilent Technologies, Inc. 2010
Printed in USA, May 7, 2010
Agilent Technologies Oscilloscopes
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