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Protocol analysis
R&S
®
MXO 4 Series
285User Manual 1335.5337.02 ─ 05
●
CS: chip select
Alternatively, digital channels can be used if MSO option R&S MXO4-B1 is installed.
Digital and analog channels cannot be used at the same time.
For triggering on a serial bus, analog or digital channel sources are required.
Remote command:
SBUS<sb>:SPI:MISO:SOURce on page 595
SBUS<sb>:SPI:MOSI:SOURce on page 596
SBUS<sb>:SPI:SCLK:SOURce on page 596
SBUS<sb>:SPI:CSELect:SOURce on page 594
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 594
SBUS<sb>:SPI:MOSI:POLarity on page 595
SBUS<sb>:SPI:CSELect:POLarity on page 593
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 592
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 597
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.
SPI bus (option R&S
MXO4-K510)
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