Serial bus analysis
R&S
®
RTB2000
224
User Manual 1333.1611.02 ─ 11
If the MSO option R&S
RTB-B1 is installed, you can use logic channels as source.
Note:
MISO is available only on bus 1. On bus 2, you can set only one "Data" line. The
MISO line occupies a second bus line. Thus, if MISO is used on bus 1, bus 2 is not
available.
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 > "Threshold".
Remote command:
CHANnel<m>:THReshold:FINDlevel
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:
Idle Time
Sets the burst idle time, during which the data and clock lines are low. Only available in
the "SPI (no CS)" setup.
SPI bus (option R&S
RTB-K1)