Samsung S5PC110 Manual page 1624

S5PC110_UM
10.2.1.1 Sub-frame Format (IEC 60958)
Each sub-frame is divided into 32 time slots numbered from 0 to 31. Time slots from 0 to 3 carry one of the three
permitted preambles. These slots affect the synchronization of sub-frames, frames, and blocks. Time slots from 4
to 27 carry the audio sample word in linear 2's complement representation.
The most significant bit (MSB) is carried by time slot 27. When a 24-bit coding range is used, the least significant
bit (LSB) is in the time slot 4.
When a 20-bit coding range is sufficient, the LSB is in the time slot 8, and time slots from 4 to 7 may be used for
other applications. Under these circumstances, the bits in the time slots 4 to 7 are designated auxiliary sample
bits.
If the source provides fewer bits than what the interface allows (24 or 20), the unused LSBs are set to a logical "0".
By this procedure, the equipment using different numbers of bits can be connected together.
•
Time slot 28 carries the validity flag associated with audio sample word. This flag is set to logical "0" if the
audio sample is reliable.
•
Time slot 29 carries one bit of user data associated with audio channel that is transmitted in the same sub-
frame. The default value of user bit is logical "0".
•
Time slot 30 carries one bit of channel status words associated with audio channel that is transmitted in the
same sub-frame.
•
Time slot 31 carries a parity bit such that time slots from 4 to 31 (inclusive) will carry an even number of ones
and an even number of zeros.
0
3 4
Sync
Preamble
7 8
L L
S Aux S
B B
Figure 10-8
10 9BHIGH-DEFINITION MULTIMEDIA INTERFACE
Audio sample word
Validity flag
User data
Channel Status
Parity bit
Sub-frame Format
28 31
M
S V U C P
B
10-15