Protocol analysis
R&S
®
RTE
642User Manual 1326.1032.02 ─ 20
Remote command:
BUS<m>:I2S:WSELect:SOURce on page 1593
WS / FSYNC Polarity
For a word select line, the polarity defines the word select values assigned to the left
and right channels.
●
"Normal": usually, 0 indicates the left channel, and 1 indicates the right channel.
●
"Inverted": 0 indicates the right channel, and 1 the left channel.
For an FSYNC line (TDM), the polarity defines the edge of the FSYNC pulse that iden-
tifies the beginning of a frame. The frame starts exactly at the next clock edge following
the selected FSYNC edge.
●
"Normal": usually, the frame begins with a rising edge.
●
"Inverted": the frame begins with a falling edge.
Remote command:
BUS<m>:I2S:WSELect:POLarity on page 1593
SDATA
Selects the source of the audio data line. The same waveforms as for SCLK are availa-
ble, and the same restrictions are applied.
Remote command:
BUS<m>:I2S:DATA:SOURce on page 1594
SDATA Polarity
Defines the interpretation of high and low signal states.
●
"Active high": HIGH (signal level above the threshold level) = 1 and LOW (signal
level below the threshold level) = 0
●
"Active low": HIGH = 0 and LOW = 1
Remote command:
BUS<m>:I2S:DATA:POLarity on page 1594
Threshold setup
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 three ways to set the threshold:
●
"Threshold"
Enter individual values for each line directly in the fields.
●
"Auto thresholds"
Executes the measurement of reference levels and sets the thresholds to the mid-
dle reference level of the measured amplitude.
This option is only available for analog sources.
●
"Couple thresholds"
Sets all thresholds to the same value. Enter the value in the "Threshold" field.
Remote command:
BUS<m>:I2S:TCOupling on page 1594
BUS<m>:I2S:CLOCk:THReshold on page 1595
BUS<m>:I2S:DATA:THReshold on page 1595
Audio signals (option R&S
RTE-K5)
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