2 Quick Start

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2.1 Capturing traffic

The general flow for capturing traffic with any Beagle analyzer is the same, whether it be the USB 480, USB 12, or I2C/SPI/MDIO analyzers with the following caveats.

When monitoring USB, it is generally advised that the Beagle analyzer’s analysis port is first attached and the capture started before the target device port is attached. This allows the descriptor information that is communicated at device connection to be captured by the Beagle analyzer.

For all other protocols, the capture can be started before or during the presence of traffic on the target bus. If traffic is already present on the bus, the first packet may appear corrupted or incomplete since the Beagle analyzer may start monitoring traffic midway into a transmission.

These are the basic steps for capturing data with a Beagle analyzer. For more detailed information, please refer to the specific sections in this manual.

1. Install the Beagle analyzer USB driver and Beagle Data Center software.

2. Plug in the Beagle analyzer into the analysis computer.

3. Attach the Beagle analyzer to the bus under test. (For USB, do not attach the target device, however, until the capture been started. The target host port can be connected now, however.)

4. Launch the Data Center application.

5. Click Connection in the toolbar and Connect to the Beagle analyzer of interest.

6. Make sure the correct capture protocol is selected in the toolbar’s pull-down list.

7. Click Settings in the toolbar. Set the capture settings as appropriate.

8. Click the appropriate tab in the transaction window to see the protocol of interest (I2C, SPI, USB, MDIO).

9. Click Capture in the toolbar to start the capture.

10. For USB, connect the target device to the Beagle USB 12/480 analyzer. Some spurious events may appear. There is no need to be alarmed since these events correspond to electrical noise created during the physical connection event.

11. As traffic is seen on the bus, it will be displayed in real time in the Data Center.

The capture can be stopped at any time by clicking the Stop button. The captured data can be filtered during or after the capture. The captured data can be saved to a binary file for future analysis or a filtered view can be exported from the Data Center software as a *.txt file, a *.csv file, or a binary *.bgl file.