Samsung S5PC110 Manual page 1627

S5PC110_UM
10.2.1.3 Channel Coding
Time slots from 4 to 31 are encoded in biphase-mark to:
•
Minimize the DC component on transmission line
•
Facilitate clock recovery from the data stream
•
Make the interface insensitive to polarity of connections
Each bit that needs to be transmitted is represented by a symbol comprising two consecutive binary states. The
first state of a symbol is always different from the second state of previous symbol. The second state of the
symbol is identical to the first if the bit to be transmitted is logical "0" and different from the first if the bit is logical
"1".
10.2.1.4 Preamble
Preambles are specific patterns providing synchronization and identification of the sub-frames and blocks. A set of
three preambles is used. These preambles are transmitted in the time allocated to four time slots (time slots 0 to
3) and are represented by eight successive states. The first state of the preamble is always different from the
second state of the previous symbol. Like bi-phase code, these preambles are DC independent and provide clock
recovery. They differ in at least two states from any valid biphase sequence.
10 9BHIGH-DEFINITION MULTIMEDIA INTERFACE
Figure 10-11 Channel coding
Clock (twice bit rate)
Source coding
Channel coding
(bi-phase mark)
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