Tektronix 4000 Series User manual

 Install a DPO4USB application module in an
MSO/DPO4000 Series oscilloscope
 Connect two P6139A passive probes (for
Low-Speed and Full-Speed USB) to
oscilloscope channels 1 and 2,
or connect a TDP1000 differential probe (for
High-speed USB) to channel 1
 Press Default Setup button
 Set Record Length to 1M points
12a 2bHigh-speed USB
Bus Setup
(requires 1 GHz model)
Wave Inspector – Pan/Zoom
3 4 USB Bus Event Table
Demo
Demo Notes
Show how to look at each packet with Wave
Inspector Pan/Zoom control.
 Connect channel 1 to D+ and channel 2 to D-,
and turn on channel 2
 Set Vertical Scales to 2 V/div and position
waveforms in upper half of display
 Set Horizontal Scale to 100 s/div
 Set Trigger Level to about 1.4 V
 Press B1 button and set Bus Type to USB
 Press Define Inputs and select appropriate
USB speed and single-ended inputs
 Set Threshold values to 1.4V
 Set Trigger Type to Bus
 Set Trigger On to Sync
 Press Menu Off button
 Press Single button
 Connect + input to D+ and – input to
D-
 Set Vertical Scale to 250 mV/div and
position in upper half of display
 Set Horizontal Scale to 10 s/div
 Set Trigger Level to about -100 mV
 Press B1 button and set Bus Type to
USB
 Press Define Inputs and select
appropriate High-speed USB
 Set High Threshold to +100 mV and
set Low Threshold to -100 mV
 Press Menu Off button
 Press Single button
 Adjust inner control to zoom in on a single
decoded packet of data
 Adjust outer control to position the zoomed
area to display the decoded information
 Press B1 button
Set Display As > Event Table to On
 Multipurpose control scrolls
through Event Table messages
Demonstrate how easy it is to view an entire
acquisition as an event table.
a
Demo Training Fact Sheet
Tektronix 4000 Series Oscilloscopes
USB Bus Demo
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Low-speed and Full-speed
USB Bus Setup
Demonstrate how the oscilloscope can trigger
on LS and FS USB packet level content and
decode the entire acquisition. Show how a
MSO4104 or DPO4104 can decode an entire
HS USB acquisition after triggering on an edge.

4000 Series USB Bus Decoding
4000 Series USB Bus Search
For more information, see the “Debugging Serial Buses in
Embedded System Designs” Application Note.
4000 Series USB Bus Event Table
Determining USB Bus Bit Rate
 Measure width of narrowest pulse(s) in USB message
 Match the pulse width to the bit rate in the table below
Min Pulse
Width USB Bit Rate USB Speed
667 ns 1.5 Mb/s Low-speed
83 ns 12 Mb/s Full-speed
2.08 ns 480 Mb/s High-speed
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© 2009 Tektronix