Teledyne LeCroy Inspector - Users Manual - Manual (Page 29)

CATC CATC Inspector User’s Manual Version 2.31
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4.4.1.3 Connection Speed Selection
This panel of the Data Recording Options dialog box allows specification of the USB branch
where the analyzer is connected. If Low-Speed is specified, the analyzer views the bus traffic as
would a low-speed device, switching its internal clock (from the full-speed 12 MHz) to 1.5 MHz
clock. Additionally, it inverts the data polarity to provide the software with the correct binary
information.
Note: To use the analyzer’s full event triggering capability with USB low-speed bus
transactions, it should be connected directly to the low-speed bus branch under test. If the
unit is connected to a full-speed branch containing low-speed traffic, the data content of
the low-speed packets will not be evaluated for triggering events. The PRE PIDs remain
valid triggering events, however, and all displays of USB traffic show complete full- and
low-speed packets.
4.4.1.4 File Name...
Use the specified file name when saving the recorded traffic data file; the default name is
“data.usb”. Any file name can be specified, though use of the “.usb” extension is recommended
(see “Open”, under “The File Menu”, above); if no extension is specified, “.usb” will be added
by default.
4.4.1.5 Save... (Recording Options)
Save the currently specified Recording Options for use in future recording sessions. Any file
name can be specified, though use of the “.rec” recommended is suggested (see “Load...”,
following); if no extension is specified, “.rec” will be added by default.
4.4.1.6 Load... (Recording Options)
Load a previously saved “*.rec” file, thus restoring a previous set of Recording Options.
4.4.1.7 Save As Default (Recording Options)
The “Save As Default” function is equivalent to the “Save...” function, specifying the file name
“default.rec”. Whenever the CATC Inspector software begins execution, it automatically loads
the “default.rec” file, if one exists.
4.4.1.8 Buffer Size
When recording without Idle, or from a low-speed branch, it is often useful to use less than the
full buffer space of the Inspector analyzer (to save recording time, or reduce the amount of