Protocol analysis
R&S
®
RTE
541User Manual 1326.1032.02 ─ 20
SCLK source ← SCLK
Sets the input channel of the clock line. Analog channels, math waveforms, and refer-
ence waveforms can be used for decoding.
Alternatively, digital channels can be used if MSO option R&S RTE-B1 is installed. Dig-
ital 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:
BUS<m>:SPI:SCLK:SOURce on page 1459
Polarity ← SCLK
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 polarity is "Idle low" (idle = 0) or "Idle high" (idle = 1).
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.
SS, MISO, MOSI
Configures the Slave Select, MISO and MOSI lines.
Source ← SS, MISO, MOSI
Sets the input channel of the selected line.
Usually, the source is one of the analog channels. Reference and math waveforms are
available as source if the trigger source is one of the analog channels but not the serial
bus.
Do not combine a reference waveform with channel or math waveform because the
time correlation of these waveforms might differ.
Alternatively, digital channels can be used if MSO option R&S RTE-B1 is installed. Dig-
ital 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:
BUS<m>:SPI:SSELect:SOURce on page 1459
BUS<m>:SPI:MISO:SOURce on page 1460
BUS<m>:SPI:MOSI:SOURce on page 1461
Polarity ← SS, MISO, MOSI
Selects whether transmitted data or the slave select signal is high active (high = 1) or
low active (low = 1).
Remote command:
BUS<m>:SPI:SSELect:POLarity on page 1460
BUS<m>:SPI:MISO:POLarity on page 1460
BUS<m>:SPI:MOSI:POLarity on page 1461
SPI bus (option R&S
RTE-K1)
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