Serial bus analysis
R&S
®
RTB2000
225
User Manual 1333.1611.02 ─ 11
A new frame begins when the idle time has expired and the clock line has been inac-
tive during that time. If the time interval between the data words is shorter than the idle
time, the words are part of the same frame.
Remote command:
12.2.3
SPI trigger
Before you set up the trigger, make sure that the bus is configured correctly. See
Chapter 12.2.2, "SPI configuration"
To trigger on SPI signals:
1. Press the [Protocol] key in the Analysis area of the front panel.
2. Select the bus that is configured for SPI.
3. Select "Trigger".
This selection has several effects:
● Enables decoding, if necessary.
● Sets the "Trigger Type" to "Serial Bus" and the trigger source to the selected
bus.
● Displays the "SPI Trigger" condition in the dialog box, below the protocol setup.
4. Check the "Source". Change it if necessary.
5. At "SPI Trigger", select the required trigger type:
● "Frame Start": beginning of the message
● "Frame End": end of the message
● "Bit <x>": a specified bit inside the message
● "Serial Pattern": a bit pattern in the message
6. If "Serial Pattern" is selected, the SPI trigger setup dialog expands to define the
serial pattern.
SPI trigger settings
The trigger settings are shown in the dialog below the bus configuration settings. In the
trigger menu, you select the trigger source, and open or close the setup dialog box.
SPI bus (option R&S
RTB-K1)
