Protocol Analysis
R&S
®
RTM20xx
158User Manual 1317.4726.02 ─ 01
For data, the default is high active.
Remote command:
BUS<b>:SPI:CS:POLarity on page 377
BUS<b>:SPI:DATA:POLarity on page 0
BUS<b>:SSPI:DATA:POLarity on page 0
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:
BUS<b>:SPI:CLOCk:POLarity on page 378
BUS<b>:SSPI:CLOCk:POLarity on page 386
Time Out
Sets the minimum idle time between two data packets. If the time interval between the
data packets is shorter, the packets are part of the same frame. Within the time out, the
data and clock lines are low. A new frame begins when the time out has expired.
Time out is only relevant for SSPI that has no chip select.
Remote command:
BUS<b>:SSPI:BITime on page 387
First Bit
Defines if the data of the messages starts with MSB (most significant bit) or LSB (least
significant bit).
Remote command:
BUS<b>:SPI:BORDer on page 379
BUS<b>:SSPI:BORDer on page 387
Symbol Size
Sets the word length, the number of bits in a message.
Remote command:
BUS<b>:SPI:SSIZe on page 379
BUS<b>:SSPI:SSIZe on page 388
Find Level
The instrument analyzes all lines that are configured for the selected bus and sets the
threshold for digitization of analog signals for each channel. If no level can be found, the
existing value remains unchanged, and you can set the thresholds manually in the chan-
nel menu: CH N > "More" (page 2) > "Threshold".
See: "Threshold" on page 31
"Find Level" is not relevant for digital channels (MSO option R&S RTM-B1). Thresholds
for digital channels are set in the "Logic > Threshold" menu.
Remote command:
CHANnel<m>:THReshold:FINDlevel on page 379
SPI/SSPI Bus (Option R&S RTM-K1)
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