Protocol analysis
R&S
®
RTE
542User Manual 1326.1032.02 ─ 20
Threshold
Sets the threshold value for digitization of signals for each line. If the signal value on
the line is higher than the threshold, the signal state is high. Otherwise, the signal state
is considered low if the signal value is below the threshold. The interpretation of HIGH
and LOW is defined by the Polarity.
There are several ways to set the threshold:
●
"Threshold"
Enter the value directly in the field.
●
"Full autoset"
Starts software algorithms for determining the signal threshold levels and bitrate.
●
"Auto thresholds"
Executes the measurement of reference levels and sets the thresholds to the mid-
dle reference level of the measured amplitude.
●
"Preset thresholds"
Selects the default threshold voltage for various signal technologies from a list. The
value is set to "Manual" if the threshold was set with "Auto threshold", or was
entered directly.
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 1462
BUS<m>:SPI:MISO:THReshold on page 1462
BUS<m>:SPI:MOSI:THReshold on page 1462
BUS<m>:SPI:SSELect:THReshold on page 1462
BUS<m>:SPI:TECHnology on page 1461
BUS<m>:SETReflevels on page 1421
BUS<m>:FAUToset on page 1421
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 1458
Word length
Sets the number of bits in a word. The maximum length is 32 bit.
Remote command:
BUS<m>:SPI:WSIZe on page 1459
Frame condition
Defines the start of a frame. A frame contains a number of successive words, at least
one word.
"SS"
Start and end of the frame is defined by the active state of the slave
select signal.
SPI bus (option R&S RTE-K1)
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