USB Analysers

   Packet-Master USB12          

   Packet-Master USB480+      







        Data Sheet
        User Manual
        Class Analysis
        Download GraphicUSB
        GraphicUSB revisions

   Packet-Master USB500 AG     


Packet-Master USB480+

Software Overview

The Packet-Master USB480 owes a large part of its functionality to the GraphicUSB application, which is supplied with the unit. A simple, yet information-rich display allows you to view every detail of a capture.

This shows the organisation of the screen after a typical capture:

Software Features

  • Capture controlled from Packet-Master unit buttons or from GraphicUSB Application.
  • Triggering on user-definable event sequences, including BNC connector input.
  • Captured document shows every detail of data transactions graphically for a fuller understanding of the USB protocol. This includes a detailed visual analysis of each packet.
  • Transactions are grouped and summarised with a header row in the event pane. Control transfers are summarised with a special header row.
  • Filters allow less significant information to be removed from the display to allow you to concentrate on the critical data.
  • Bookmarks can be set on events of interest to allow them to be quickly located.
  • Each event is analysed in detail, with any significant features explained, and possible errors or warnings highlighted.
  • Data pane shows the data content of any packet.
  • Detailed timeline and bus bandwidth usage pane.
  • Comprehensive search functions.
  • Events display, detail analysis or data can be printed.
  • Standard software up-grades are free of charge from our web site.
  • Software can be freely used as a viewer in the absence of the Analyser Hardware.
  • A multi-document interface allows comparison between captures.
  • Capture size only limited by RAM size.
  • Export any range of events to text file, with a chosen level of filtering.
  • Export all or chosen descriptors as annotated source code.
  • Export data from a selected event, or a range of events.
  • Custom event filter.
  • Captures can be controlled from another application.
  • Optional Class Analysis Modules.

Download GraphicUSB and try it out

The downloadable package contains the full current release of GraphicUSB, together with some sample captures for you to examine. The sample files are in a folder named 'Samples'.

This also demonstrates how you can view capture files in the absence of a Packet-Master Analyser.

Mixed Speed on a Single Link

This view of part of a screen shot from Graphic USB shows a representation of data being transferred at two different speeds on the same link. Each packet is preceded by a coloured marker indicating High Speed, Full Speed or Low Speed. This makes the function of the PREAMBLE packet very clear, and shows precisely how split transactions work. Each event has a precise timestamp (left). Notice also the detailed timing information for Hub Setup time, End of Packet duration, and IDLE state time.

View by Control Transfers
(less significant events filtered)

By clicking on the filter buttons for less significant event types, the sequence of top-level control transfer headers may be viewed in isolation. This ability to view information at an appropriate level of complexity makes Graphic USB an invaluable tool for getting straight to the heart of the matter. In this example we have chosen to display top-level transfer information plus bus state events.

Full Analysis and Data Panes

By clicking on an event row in the event pane, a complete analysis of the event is displayed in the analysis pane, and the data content is shown in its entirety in the data pane. Where relevant, any information selected in the analysis pane is highlighted in the data pane for easy identification. All standard requests and descriptors are analysed in detail. Discrepencies are described.

Timeline and Bandwidth Pane

The timeline view clearly shows the frames or micro-frames, and the packet positioning within them. The view can be zoomed in to show individual packets. The bandwidth view shows the percentage bus utilisation, frame by frame - an important consideration for high performance devices..