Protocol analysis
R&S
®
RTP
539User Manual 1337.9952.02 ─ 12
There are several ways to set the threshold:
●
"Threshold"
Enter the value directly in the field.
●
"Autoset"
Starts software algorithms for determining the signal threshold levels and bitrate.
●
"Find thresholds"
Executes the measurement of reference levels and sets the thresholds to the mid-
dle reference level of the measured amplitude.
Note: If the sources are digital channels, the same threshold values are used for the
parallel and the serial buses. You can set the thresholds either in the parallel bus con-
figuration or in the serial bus configuration.
Remote command:
BUS<m>:SPI:SCLK:THReshold on page 1589
BUS<m>:SPI:MISO:THReshold on page 1589
BUS<m>:SPI:MOSI:THReshold on page 1589
BUS<m>:SPI:SSELect:THReshold on page 1589
BUS<m>:SETReflevels on page 1548
BUS<m>:FAUToset on page 1549
Bit order
Defines if the data of the messages starts with msb (most significant bit) or lsb (least
significant bit). The display of the decoded signal considers this setting, results are dis-
played in the specified order.
Remote command:
BUS<m>:SPI:BORDer on page 1586
Word length
Sets the number of bits in a word. The maximum length is 32 bit.
Remote command:
BUS<m>:SPI:WSIZe on page 1587
13.3.2.2 Advanced settings
Access: [Protocol] > "Advanced" tab.
SPI bus (option R&S RTP-K1)
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