Teledyne Lecroy Frontline BPA 600, Hardware And Software User Manual, Page: 100 / 348

Symbol Description
A green circle means the frame was not fully decoded. There are several reasons why this might
happen.
l
One reason is that the frame compiler hasn't caught up to that frame yet. It takes some time
for the analyzer to compile and decode frames. Frame compilation also has a lower priority
than other tasks, such as capturing data. If the analyzer is busy capturing data, frame
compilation may fall behind. When the analyzer catches up, the green circle changes to either
a green dot or no dot.
l
Another reason is if some data in the frame is context dependent and we don't have the
context. An example is a compressed header where the first frame gives the complete
header, and subsequent frames just give information on what has changed. If the analyzer
does not capture the first frame with the complete header, it cannot decode subsequent
frames with partial header information.
A magenta triangle indicates that a bookmark is associated with this frame. Any comments
associated with the bookmark appear in the column next to the bookmark symbol.
Table 4.3 - Frame Symbols (continued)
4.3.1.11.6 Decode Pane
The Decode pane (aka detail pane) is a post-process display that provides a detailed decode of each
frame transaction (sometimes referred to as a frame). The decode is presented in a layered format that can
be expanded and collapsed depending on which layer or layers you are most interested in. Click on the plus
sign to expand a layer. The plus sign changes to a minus sign. Click on the minus sign to collapse a layer.
Select
Show All or Show Layers from the Format menu to expand or collapse all the layers. Layers retain their
expanded or collapsed state between frames.
Protocol layers can be hidden, preventing them from being
displayed on the
Decode pane. Right-click on any protocol
layer and choose Hide [protocol name] from the right-click
menu.
In a USB transaction, all messages that comprise the
transaction are shown together in the detail pane. The color
coding that is applied to layers when the detail pane displays a single message is applied to both layers and
messages when the detail pane displays a transaction. To keep the distinction between layers and messages
clear, each header of each message in the detail pane ends with the word “Message” or “Messages”. The
latter is used because data and handshake messages are shown as a single color-coded entry
Each protocol layer is represented by a color , which is used to highlight the bytes that belong to that protocol
layer in the Event , Radix , Binary and Character panes. The colors are not assigned to a protocol, but are
assigned to the layer.
The Event , Radix , Binary , Character and Decode panes are all synchronized with one another. Clicking on
an element in any one of the panes highlights the corresponding element in all the other panes.
Click the Toggle Expand Decode Pane icon to make the Decode pane taller. This allows for more of
a lengthy decode to be viewed without needing to scroll.
Chapter 4 Capturing and Analyzing Data TELEDYNE LECROY
Frontline BPA 600 Hardware & Software User Manual 92