Teledyne LeCroy USB Protocol Suite User Manual (Voyager_Advisor T3_Mercury) - Manual (Page 231)

USB Protocol Suite User Manual 231
Link Tracker (3.0) Teledyne LeCroy Corporation
9.8 Link Tracker (3.0)
The Link Tracker window displays a detailed chronological view of events. Events are
shown on a channel‐by‐channel basis in columns within the window.
Figure 9.23: Link Tracker Window
You can select the number of columns to view more or less data at one time.
Each time slot in the vertical axis represents the minimum time that a DWORD requires to
traverse the bus.
Note: On Symbol Displays ‐ There will occasionally be "blank" symbols inserted into the Link Tracker
display (or symbols removed) to compensate for timestamp rate matching between the various
time bases. This has to do with the problem that there are 3 clock domains (Rx, Tx, and our
precision timestamp) that need to be represented in the trace. The nominal 2nSec / symbol
Transmit and Receive clocks can vary up to 500ppm per the USB Specification, whereas the
Analyzer is accurate to 3ppm. Blank entries and missing entries in the link tracker are there to
compensate for this difference, and to try to maintain the most accurate relationship amongst
these clocks and present the closest time relationship between the downward stream and the
upward stream. The clock listed in the Time column is our precision 3ppm clock timestamp.
Toolbar: Presents buttons for changing the format of the Link Tracker window.
Main Display Area: Displays traffic chronologically as it occurred in the recording. The
window divides into columns: the first column shows time and traffic is shown on a
channel‐by‐channel basis in the columns on the right.