Protocol analysis
R&S
®
RTP
838User Manual 1337.9952.02 ─ 12
Source
Defines the source for the data signal. You can select analog channels "C1" to "C4",
and also active math and reference waveforms as source. If you want to trigger on the
serial bus, analog channel sources are required.
Remote command:
BUS<m>:USBThree:SOURce on page 2044
Polarity
Defines the signal polarity settings. Permitted selections are "Normal" and "Inverted".
Remote command:
BUS<m>:USBThree:POLarity on page 2044
Thresholds
Sets the threshold values for digitization of the analog signals.
The USB 3.1 standard uses 2-state signals with an upper and a lower voltage level.
Permitted thresholds values are in the range of -2 V to +2 V, the default is -40 mV to
+40 mV.
If the signal value on the line is higher than the upper threshold, the signal state is con-
sidered high. Otherwise, if the signal value is below the lower threshold, the signal
state is considered low. The two threshold levels allow configuring a hysteresis setting.
There are two ways to set the thresholds:
"Threshold"
Enter the upper and lower values directly into the fields.
"Find thresh-
olds"
Executes the measurement of reference levels and sets the thresh-
olds to the middle reference level of the measured amplitude.
Remote command:
BUS<m>:USBThree:THRHigh on page 2045
BUS<m>:USBThree:THRLow on page 2045
BUS<m>:SETReflevels on page 1548
Scramble Mode
Selects if the data pattern is scrambled or unscrambled. Scrambling as specified in the
standard minimizes EMI emissions, the unscrambled mode can simplify testing and
debugging.
Remote command:
BUS<m>:USBThree:SCRMode on page 2045
Show thresholds
If enabled, the threshold levels are displayed in the diagram.
Remote command:
BUS<m>:THReshold on page 1549
13.19.2.2 USB 3.1 DSP settings
Access: [Protocol] > "Setup" tab > "Protocol = USB 3.1" > "DSP" tab
USB 3.1 (option R&S
RTP-K61/K62)
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