4 Triggering
170 InfiniiVision Oscilloscopes User’s Guide
USB Trigger
USB trigger will trigger on a Start of Packet (SOP), End of Packet (EOP) signal, Reset
Complete (RC), Enter Suspend (Suspend), or Exit Suspend (Exit Sus) on the differential
USB data lines (D+ and D-). USB Low Speed and Full Speed are supported by this trigger.
1 Press [Save/Recall]&Default Setup.
2 Press the [Label] key to switch labels on.
3 Turn on any analog or digital channels that you will be using for the USB signals.
4 Press the [More] key in the Trigger section of the front panel, rotate the Entry knob
until USB is displayed in the Trigger softkey, then press the Settings softkey to display
USB Trigger Menu.
5 Press the Speed softkey to select the speed of the transaction being probed.
You may select Low Speed (1.5 Mb/s) or Full Speed (12 Mb/s).
6 Press the D+ and D– softkeys to select the channel connected to the USB signal D+
and D– lines. The D+ and D– labels for the source channels are automatically set.
Bus Idle
SOP
SE0 portion of EOP
End of packet trigger
Signal
speed
D+ source
channel
D– source
channel
Trigger on:
condition
Trigger level
or threshold
Currently selected
data source
USB trigger
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