PCIe Compliance Testing Reference
PRELIMINARY INFORMATION
Jetson AGX Orin Series Tuning and Compliance Guide DA-11040-001_v0.7 | 18
The 2× single measurements are for:
Vcross Max, Vcross Min and Delta
Vmax and Vmin
Rise-Fall Matching
For SE measurements 2× high impedance SE probes must be attached to REFCLK-, and
REFCLK+. It is using breakout boards with appropriate scope high impedance setup or probe
solder pads, which are high impedance probes with solder pads. A 2 pF C
load must be applied
to each REFCLK-, and RefCLK+ signal pad.
General Setup Considerations
Turn off Sin(x)/x interpolation.
For measurements with long captures of clock, maximize real sampling without going into
interpolated time sampling.
For measuring edge information, interpolated time is necessary since less than 1 ns/div
usually.
Probes must be calibrated and de-skewed especially for the single-ended probe
measurements.
Rise-Fall Matching
Set for 1 us/div (1,000 periods). Maximum real-time sampling (not interpolated time).
Capture REFCLK+ and REFCLK- on two separate channels and save into CSV files (such as
data1 and data2).
Some scopes should automatically generate a CSV for each channel
Write a script or MATLAB function to find the following number:
The formula essentially means:
(data1 - data2)/data1 * 100, when data1 > data2
Max
(data2 – data1)/data2 * 100, when data2 > data1
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