L64105 LSI Logic Corporation, L64105 Datasheet - Page 220

• Manufacturer Part Number: L64105
• Description: Mpeg-2 Audio/video Decoder
• Manufacturer: LSI Logic Corporation

6.3.6.5 Linear PCM Audio Stream
6.3.7 Preparsing A/V PES Packets from a Transport Stream
6-24
Error Check Point: Packet data and packet length in the first byte of
packet data
Description: If there are syntax errors in the packet length field (zero
packet length), the Preparser searches for the next start code and
resynchronizes to it.
If the ERRORn signal is asserted during packet data, the Packet Error
Interrupt bit in Register 4
interrupt is not masked, and the error data is stored anyway.
The L64105 accepts two interleaved PES streams (one video, one audio)
from a transport stream demultiplexer. The transport stream is different
from the program stream because the PES packets are repacketized into
fixed 188-byte (184 payload and 4 header) packets. The PES packets
may be split at non-PES packet boundaries. This means that there must
be duplicate states for parsing the two PES streams and two PES header
buffers.
Figure 6.14 Parsing an Audio/Video PES Transport Stream
A/V PES Stream
Channel Interface
VVALIDn
AVALIDn
AREQn
VREQn
Preparser and
(page
Write FIFO
L64105
4-9) is set, INTRn is asserted if the
Audio ES Channel Buffer
Video ES Channel Buffer
Video PES Header
Audio PES Header
Channel Buffer
Channel Buffer
SDRAM