Serial bus analysis
R&S
®
RTA4000
263
User Manual 1335.7898.02 ─ 08
Clock
Selects the input channel of the clock line.
If the MSO option R&S
RTA-B1 is installed, you can use logic channels as source.
Remote command:
Slope
Selects if data is sampled on the rising or falling slope of the clock. The clock slope
marks the begin of a new bit.
Remote command:
MOSI / MISO / Data
Select the input channel of the data lines. MOSI is mandatory, the MISO line is
optional.
If the MSO option R&S
RTA-B1 is installed, you can use logic channels as source.
Note:
MISO is available only on bus 1 and bus 3. On bus 2 and bus 4, you can set
only one "Data" line. The MISO line occupies a second bus line. Thus, if MISO is used
on bus 1 or bus 3 , bus 2 or bus 4 is not available respectively.
Remote command:
Polarity
Selects if the transmitted signal is high active (high = 1) or low active (low = 1).
For CS, the default is low active.
For MOSI / MISO, the default is high active.
For data, the default is high active.
Remote command:
Threshold, Find Threshold
Set the signal threshold for the source channel. Enter a value, or use "Find Threshold"
to set the threshold to the middle reference level of the measured amplitude.
For analog channels, you can find the value also in the "Vertical" menu > "Chan-
nel
<n>" > "Threshold"
For logic channels, you can find the value also in the "Logic" menu > "Technology".
SPI bus (option R&S
RTA-K1)
