Samsung S5PC110 Manual page 1623

S5PC110_UM
10.2 SPDIF (AUXILIARY INFORMATION)
10.2.1 FRAME FORMAT
A frame is composed of two sub-frames. The transmission rate of frames corresponds exactly to the source
sampling frequency. In the 2-channel operation mode, the samples taken from both channels are transmitted by
time multiplexing in consecutive sub-frames.
Usually, sub-frames related to channel 1 (left or "A" channel in stereophonic operation and primary channel in
monophonic operation) use preamble M. However, the preamble is changed to preamble B once every 192
frames. This unit is composed of 192 frames. It defines the block structure used to organize the channel status
information.
On the other hand, sub-frames of channel 2 (right or "B" in stereophonic operation and secondary channel in
monophonic operation) always use preamble W. In single channel operation mode and broadcasting studio
environment, the frame format is identical to 2-channel mode. The data is only carried in channel 1. In the sub-
frames allocated to channel 2, time slot 28 (validity flag) is set to logical "1" (invalid).
M Channel1
Frame 191
W Channel 2 B Channel 1
Sub-frame
Figure 10-7
10 9BHIGH-DEFINITION MULTIMEDIA INTERFACE
W Channel 2 M
Sub-frame
Frame 0
Start of Block
Frame Format
Channel 1 W Channel 2
Frame 1
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