Protocol analysis
R&S
®
RTO6
530
User Manual 1801.6687.02 ─ 05
13.5.1.2
Left justified data format
The left justified data format is very similar to the I²S standard, but 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. The data word can be shorter than the channel
length.
In addition to the standard configuration, the R&S
RTO6 can analyze also left justified
data formats which send the data word with offset to the WS edge. The bit order can
be MSBF or LSBF.
13.5.1.3
Right justified data format
The right-justified data format is similar to the left-justified, but 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.
The R&S
RTO6 can decode right justified signals with MSBF and LSBF bit order.
13.5.1.4
TDM
The Time Division Multiplexed (TDM) audio format is not standardized and provides
high flexibility for transfer of more than two audio data channels on one line. On the
word select line, it uses frame synchronization pulses to identify the beginning of a
frame. On the data line, channel blocks of a defined length are transmitted. Each block
contains an audio word that can be shorter than the channel length.
Each frame can start with frame offset bits, which preceed the first channel. Inside the
channel, the audio word also can have an offset to the channel start.
Channel length, channel offset and word length are dependent values:
Channel length
≥
Word Channel offset
Audio signals (option R&S
RTO6-K510)
