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): 80/166頁
文件大?。?/td> 1015K
代理商: L64007
Arch
12 Wed May 28 17:36:23 1997
Draft 1/21/97
2-12
Architecture
PRE.4 for Rev. D
Copyright 1997 by LSI Logic Corporation. All rights reserved.
If the L64007 is used in a network producing much jitter in the PCR pack-
ets, the clock recovery system might not lock correctly unless a proper
digital lter is applied to the FErr to remove the jitter noise.
Jitter noise occurs when many spikes are detected in the FErr value. It
occurs when values extracted for PCR and LMC are suddenly far apart.
To smooth the jitter in the arrival of the data, use the extended channel
buffer mode. This mode allows the L64007 to temporarily store PES
audio and video streams in the external DRAM until the L64007 fetches
this data into its 512-byte transport buffer. If the buffer size in the external
DRAM is large enough to accommodate the worst-case jitter, a smooth
audio and video output is guaranteed; this prevents the overow or
underow condition in the A/V decoder device.
Time-base jitter is handled differently than data jitter, because it is not
practical to store the channel data in an external smooth buffer and then
read the data back in at the transport rate. The preferred scheme is to
MCLK
MCLK_SDC
Extracted PCR Value
42-Bit
PCR Register
Transport Rate
Stream Counter
42-Bit Counter
Local Master
Clock
16-bit
Sigma Delta
Host
PCR PID
Processor
PCR
T rate
LM count
Timing
Control
Processor
CDCLK
CDEN
Channel Data
L64007
VCxO
RC
Filter
Modulator Register
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