L64724 LSI Logic Corporation, L64724 Datasheet - Page 168

• Manufacturer Part Number: L64724
• Description: Satellite Receiver
• Manufacturer: LSI Logic Corporation

Figure 6.14 DSS Packet
Figure 6.15 MPEG-2 Transport Packet
Figure 6.16 L64724 Transport Packet
6-12
Inverted
Sync
Sync
Byte
Sync
Byte
Byte
204 Bytes
An MPEG-2 RS(204,188) protected transport packet consists of 204
bytes, including 1 sync byte, 187 data bytes, and 16 redundancy bytes.
Figure 6.15
In the DVB data structure, one out of every eight synchronization words
in the data stream is mod 2 complemented.
format of the L64724 transport packet.
Given a bit stream that consists of a sequence of the packets shown in
Figure
predefined sync byte.
In addition to providing the proper data alignment for the Deinterleaver
and Reed-Solomon Decoder modules, the second synchronization stage
(Reed-Solomon Deinterleaver Synchronization) resolves the 180-degree
phase uncertainty that the upstream demodulator may have introduced.
The first (Viterbi) synchronization stage is not able to detect a phase
uncertainty error.
Decoding Pipeline Synchronization
8 X 204 Bytes
6.16, the second synchronization stage searches for the
187 Data Bytes
Sync
Byte
130 Data Bytes
shows the data format of the MPEG-2 Transport Packet.
204 Bytes
146 Bytes
Inverted
Sync
Byte
RS(146,130)
RS(204,188)
16 Bytes
16 Bytes
Figure 6.16
shows the data