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Serial Bus Analysis
R&S
®
RTB2000
176User Manual 1333.1611.02 ─ 03
Remote command:
CHANnel<m>:THReshold on page 256
CHANnel<m>:THReshold:FINDlevel on page 256
DIGital<m>:THReshold on page 433
Word Size
Sets the word length (or symbol size), which is the number of bits in a message. The
maximum word length is 32 bit.
You can also define the bit order, which determines if the data of the messages starts
with "MSB" (most significant bit) or "LSB" (least significant bit).
Remote command:
BUS<b>:SPI:SSIZe on page 376
BUS<b>:SSPI:SSIZe on page 378
BUS<b>:SPI:BORDer on page 375
BUS<b>:SSPI:BORDer on page 378
Idle Time
Sets the burst idle time, during which the data and clock lines are low. Only available in
the SSPI setup.
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:
BUS<b>:SSPI:BITime on page 377
12.2.3 SPI/SSPI Trigger
Before you set up the trigger, make sure that the bus is configured correctly. See
Chapter 12.2.2, "SPI/SSPI Configuration", on page 173.
To trigger on SPI and SSPI signals:
1. Press the PROTOCOL key in the Analysis area of the front panel.
2. Select the bus that is configured for SPI or SSPI.
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. 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
SPI/SSPI Bus (Option R&S RTB-K1)
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