LeCroy Advisor, User Manual

Page: 69 / 174

USB Advisor User Manual Chapter 6: Reading a Trace
LeCroy Corporation
61
6.25 Using the Trace Navigator
You can use the Trace Navigator to show the structure of the
entire trace from different points on the Trace view. This way you
can refine the trace view to a packet range in the trace that is
most interesting to you. This range can be set by you to show
smaller parts of the trace.
To display the Navigator bar, click in the toolbar.You can
also select the Navigation Bar checkbox in the Display Options
General window to have the Navigator open whenever you open
the Trace software.
The Navigator bar can be repositioned in the trace and can be
oriented horizontally or vertically, docked or undocked by
dragging the parallel bars at the top or side of the Navigator bar.
By default, the Navigator bar appears vertically to the right of the
trace window when opened.
The Navigator bar represents different types of trace information
in the order of the packets. The top of each bar corresponds to
the first packet in the trace, and the bottom corresponds to the
last packet. The Navigator bar is made up of three parts:
Pre and Post-Trigger traffic, Errors, and Types of Traffic.
At any time, a line in the navigator bar of one pixel in height
represents a fraction of the trace data. If the Navigation bar is
400 pixels high, then each bar in this example would represent
1/400 of the trace. If the trace had 4000 packets total, each bar
would represent ten packets. In the Types of Traffic portion of the
navigation bar, the color of the bar would be that of the most
important item in those ten packets. See “Navigator Bar
Attributes” on page 63.
Drag the yellow caret, at the top or bottom, to set the packet
range. When you move the caret, a message shows the packet
range.
The blue caret indicates the current packet position in the trace
view.