Samsung S5PC110 Manual page 1909

S5PC110_UM 6 SPDIF TRANSMITTER
6.4 FUNCTIONAL DESCRIPTIONS
6.4.1 DATA FORMAT OF SPDIF
6.4.1.1 Frame Format
A frame is uniquely composed of two sub-frames. The transmission rate of frames corresponds exactly to the
source sampling frequency.
In the 2-channel operation mode, the time multiplexing transmits samples taken from both channels in consecutive
sub-frames. Sub-frames related to channel 1(left or "A" channel in stereophonic operation and primary channel in
monophonic operation) normally use preamble M. However, the preamble is changed to preamble B once every
192 frame. This unit composed of 192 frames defines the block structure used to organize the channel status
information. Sub-frames of channel 2(right or "B" in stereophonic operation and secondary channel in monophonic
operation) always use preamble W.
In the single channel operation mode in broadcasting studio environment the frame format is identical to the 2-
channel mode. Data is carried only in channel 1. In the sub-frames allocated to channel 2, time slot 28 (validity
flag) should be set to logical "1" ("1" means not valid).
M Channel1 W Channel 2 B Channel 1 W Channel 2 M Channel 1 W Channel 2
Sub-frame Sub-frame
Frame 191 Frame 0 Frame 1
Start of Block
Figure 6-2 SPDIF Frame Format
6-3