Serial data analysis with glscopeclient: PCIe decode and signal integrity

In this video, we demonstrate analysis of a 5 Gbps PCI Express 2.0 signal from the physical layer up to the transport layer using entirely open source software.

Get the code: https://github.com/azonenberg/scopeha...

The test subject is the VL805 XHCI controller on a Raspberry Pi 4. Data is collected using a Teledyne LeCroy D400A-AT-PB2 4 GHz active differential probe and digitized using a Teledyne LeCroy WaveRunner 8404M-MS 4 GHz 40 Gsps oscilloscope.

0:00 introduction
0:30 FFT/waterfall
1:20 spread spectrum clock modulation analysis
2:30 protocol decoding
5:25 eye pattern, de-emphasis removal
6:20 comparing signal with and without de-emphasis through a lossy emulated channel
8:05 comparing different levels of emphasis through a lossy emulated channel
9:00 jitter measurement setup
10:30 comparing Tj histogram with and without de-emphasis
11:45 jitter spectrum analysis