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Protocol analysis
R&S
®
MXO 5 Series
296User Manual 1802.3369.02 ─ 02
For triggering on a serial bus, analog or digital channel sources are required.
Remote command:
SBUS<sb>:SPI:MISO:SOURce on page 651
SBUS<sb>:SPI:MOSI:SOURce on page 652
SBUS<sb>:SPI:SCLK:SOURce on page 653
SBUS<sb>:SPI:CSELect:SOURce on page 650
Clock polarity
Two settings define the clock mode: the clock polarity and the clock phase. Together,
they determine the edges of the clock signal on which the data are driven and sam-
pled.
A master/slave pair must use the same parameter pair values to communicate. The
clock phase defines the slope. It selects if data is stored with the rising or falling slope
of the clock. The slope marks the begin of a new bit.
Polarity: MOSI, MISO, CS
Selects if the transmitted signal for the respective line is active high (high = 1) or active
low (low = 1).
For triggering on a serial bus, analog or digital channel sources are required.
Remote command:
SBUS<sb>:SPI:MISO:POLarity on page 651
SBUS<sb>:SPI:MOSI:POLarity on page 652
SBUS<sb>:SPI:CSELect:POLarity on page 650
Bit order
Selects the bit order, which determines if the data of the messages starts with MSB
(most significant bit) or LSB (least significant bit).
Remote command:
SBUS<sb>:SPI:BORDer on page 649
Word length
Sets the word length (or symbol size), which is the number of bits in a message. The
maximum word length is 32 bit.
Remote command:
SBUS<sb>:SPI:WSIZe on page 654
Threshold
Press "Set thresholds", to open the "Threshold setup" dialog.
Enter the value directly in the field of the threshold setup dialog.
Additional to the threshold, you can also set a hysteresis.
If the signal value on the line is higher than the threshold, the signal state is high. Oth-
erwise, the signal state is considered low if the signal value is below the threshold.
The interpretation of high and low is defined by the "Polarity: MOSI, MISO, CS"
on page 296.
SPI bus (option R&S
MXO5-K510)
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