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/scopehal-apps/ 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