Specifications

8
Margin is calculated:
Single-sided specification:
Margin = (Value
Specification
– Value
actual
)/Value
Specification
Double-sided specification:
Margin = lowest of: (Value
Specification_High
– Value
actual
)/Range
Specification
and (Value
Specification_Low
– Value
actual
)/Range
Specification
Figure 9. The DisplayPort EPVC test software results report documents your test,
indicates the pass/fail status, the test specification range, the measured values, and
the margin.
Margin analysis
In addition to providing you with
measurement results, the DisplayPort
Electrical Performance Validation and
Compliance 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.
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 7 for example).
AUX channel and Dual Mode
testing support
The DisplayPort EPVC software also
supports Dual Mode (DP++) testing
for devices that are to interoperate
with HDMI displays. Eye diagram and
jitter tests have been ported from the
HDMI software application, which is
a preferred application in test labs
around the world.
New to DisplayPort 1.1a, but most
prevalently for CTS 1.2b, is AUX channel
physical layer testing. These new tests are
shown at the bottom of Table 1.
Dual Mode and the AUX channel test suite
are selected in the Set Up screen shown in
Figure 1.