14 | Keysight | N5393D PCI Express® 3.0 (Gen3) Software for Infiniium Oscilloscopes - Data Sheet
Receiver Stressed Eye Calibration
The PCI Express 3.0 BASE specification
outlines the requirements for a PCIe
3.0 compliant receiver equalizer. The
capabilities defined employ a reference
equalizer that consists of a CTLE
(continuous time linear equalizer) and
a single tap DFE (decision feedback
equalizer).
In order to ensure that your devices
receiver equalizer is at least as capable as
the reference equalizer defined in the PCIe
3.0 BASE specification, it is necessary
to execute a stressed eye receiver test.
The signal that must be presented to the
receiver must represent a worst case
condition yet still be a valid and compliant
PCIe 3.0 signal.
Figure 18. N4903B JBERT Setup for PCIe 3.0 Receiver Stress Testing.
To achieve this calibrated worst case
signal, it is necessary to carefully
construct a significantly small amplitude
signal that contains a prescribed amount
of certain specified impairments. These
impairments include sinusoidal jitter,
random jitter, and channel induced
intersymbol interference (ISI). In addition,
it is necessary to add common mode and
differential mode noise simultaneously
to the jitter cocktail in order to emulate
system crosstalk.
Set target stressed voltage test
parameters for the calibration
Set target stressed jitter test
parameters for the calibration
The N5393D-4FP along with your N4903B
JBERT bit error ratio tester and required
accessories, such as an 81150A Pulse
Function Arbitrary Noise Generator,
N4916B De-emphasis Signal Converter,
and N4915A-014 PCI Express 3.0
calibration channels.
Figure 19. Setting up instrument control of the N4903B and 81150A from the PCIe application.
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