R&S RTO6, Руководство пользователя

Страница: 533 / 2677

Protocol analysis
R&S
®
RTO6
533 User Manual 1801.6687.02 ─ 05
SCLK
Selects the source of the clock line.
Usually, the source is one of the analog channels. Reference and math waveforms are
available as source if the trigger source is one of the analog channels but not the serial
bus.
Do not combine a reference waveform with channel or math waveform because the
time correlation of these waveforms might differ.
Alternatively, digital channels can be used if MSO option R&S RTO6-B1 is installed.
Digital and analog channels cannot be used at the same time.
For triggering on a serial bus, analog or digital channel sources are required.
Remote command:
BUS<m>:I2S:CLOCk:SOURce
on page 1738
SCLK Polarity
Sets th polarity of the clock signal, that is the edge at which the instrument samples the
data on the data line. Usually, the rising edge is used. The R&S
RTO6 can also ana-
lyze the converse setup.
Remote command:
BUS<m>:I2S:CLOCk:POLarity
on page 1738
WS / FSYNC
Selects the source of the word select line for I²S standard, left- and right-justified data
formats, or the source of the frame synchronization pulse for TDM audio signals. The
same waveforms as for
SCLK are available, and the same restrictions are applied.
Remote command:
BUS<m>:I2S:WSELect:SOURce
on page 1738
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 1739
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 1739
Audio signals (option R&S RTO6-K510)