Serial bus analysis
R&S
®
RTA4000
315
User Manual 1335.7898.02 ─ 08
For logic channels, you can find the value also in the "Logic" menu > "Technology".
Remote command:
CHANnel<m>:THReshold:FINDlevel
Clock
Selects the source of the clock line.
If the MSO option R&S
RTA-B1 is installed, you can use logic channels as source.
Remote command:
Slope
Sets the clock edge at which the instrument samples the data on the data line. Usually,
the rising edge is used. The R&S
RTA4000 can also analyze the converse setup.
Remote command:
Data
Selects the source of the data line.
If the MSO option R&S
RTA-B1 is installed, you can use logic channels as source.
Remote command:
Active
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:
Variant
Selects the protocol variant of the audio signal. The configuration possibilities in
R&S
RTA4000 exceed the definitions of the standards.
"I2S Standard" Inter-IC Sound standard audio format. The first byte of the audio word
is delayed one clock period from the leading edge of the word select
pulse.
"Left justified"
The left justified data format is similar to the I²S standard. The first
byte of the audio word is aligned with the leading edge of the word
select pulse. Thus the audio word is left justified within the frame. In
R&S
RTA4000, an additional offset of the audio word can be set.
"Right justified" In right justified data, the last byte of the word in the frame is aligned
with the trailing edge of the word select pulse. Thus the audio word is
right-aligned within the frame. In R&S
RTA4000, an additional offset
of the audio word can be set.
Audio signals (option R&S
RTA-K5)
