參數(shù)資料
型號: L64007
廠商: LSI CORP
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP160
封裝: PLASTIC, QFP-160
文件頁數(shù): 57/166頁
文件大小: 1015K
代理商: L64007
Arch
7 Wed May 28 17:36:23 1997
Draft 1/21/97
L64007 MPEG-2, DVB, JSAT Transport Demultiplexer Technical Manual
2-7
PRE.4 for Rev. D
Copyright 1997 by LSI Logic Corporation. All rights reserved.
The CRU extracts the PCR belonging to the program currently being
demultiplexed from the transport bit stream. The CRU receives the trans-
port data directly from the Channel Decoder Interface at the same time
that the data is written into the Channel FIFO. Since the CRU operates
on the channel clock, no clock jitter is introduced during PCR value
extraction.
For a particular program, only one PID carries the PCR information. This
PID value is programmed into the PCR_PID Register. To extract the PCR
value:
1.
The CRU searches for transport packets with a PID eld value that
matches the PCR_PID value.
2.
Once the CRU has found a match, it examines the adaptation eld
(AF) ags in the transport header and checks if AF = 102 or 112.
3.
Examines the PCR_ag in the adaptation eld. If PCR_ag = 1, the
CRU extracts the 42-bit (6-byte) PCR value.
High-speed
Interface
Channel
Data Input
Channel
Interface
PID
Processor
Video
Channel
Transport
FIFO
DRAM Control
MMU
Host Processor
Interface
External
DRAM Memory
Host
P
Audio
Clock
Generator
VCxO Clock
VCxO Control
Audio Clock
Decoder
A/V
AUX Port
Channel
FIFO
Decoder
Output Control Unit
(PPU)
8
Audio
Channel
Transport
FIFO
16
8/16
Clock
Recovery Unit
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