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參數(shù)資料
| 型號(hào)： | SAA7205 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | MPEG-2 systems demultiplexer |
| 中文描述： | MPEG - 2系統(tǒng)解復(fù)用器 |
| 文件頁數(shù)： | 16/84頁 |
| 文件大小： | 363K |
| 代理商： | SAA7205 |
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1997 Jan 21
16
Philips Semiconductors
Preliminary specification
MPEG-2 systems demultiplexer
SAA7205H
7.3
Error handling
The error handling module responds to four situations in
which errors are present in the incoming stream:
An erroneous packet is signalled to the demultiplexer,
by means of the PKTBAD/PKTBAD input signal.
The FEC decoder drives this signal LOW (or HIGH)
should it discovers that the number of errors in a packet
exceeds its correction capability. The polarity of the
PKTBAD/PKTBAD input signal is programmable
(bit Bad_pol, address 0x0100; see Table 13).
The transport_error_indicator bit in the transport packet
header is set (equals logic 1), indicating that an error
occurred prior to, or during transmission
A continuity counter discontinuity is detected
The parser detects a syntax error in a packet, or is out
of sync.
In the first two cases, the transport_error_indicator bit in
the transport packet header is set. In all cases error
handling depends on the data stream the packet belongs
to, as indicated in Table 3. Most of the functions in this
table are executed in the data filters, not in the error
handling module. Error handling is therefore implemented
as a distributed function.
If the parser detects a syntax error or is out of sync, the
error handling module discards all incoming data, and an
interrupt is set (bit prs_sync_lost, address 0x0000,
see Table 13).
The error handling module keeps track of an average error
count. The module counts every occurrence of both
PKTBAD = 0 (or PKTBAD = 1) and
“transport_error_indicator = 1. The 16-bit error count value
can be read by the microcontroller, which can also reset
the counter every once in a while by writing all zeroes
(00..00) to the register (word cnt15 to cnt0], address
0x0200; see Table 13). The microcontroller can thus
determine an average packet error rate.
Table 3
Error handling algorithms
DATA STREAM
OPTION
ERROR HANDLING
Video
third party decoder
erroneous transport packets are discarded, no error flag is set, but a
sequence_error_code (0x000001B4) is inserted, whenever a
continuity_counter discontinuity is discovered
handling is altogether done in the SAA7201 source decoder
discard erroneous packets
discard erroneous packets
PES packet data are passed to the microcontroller. The error handling
decision is left to the microcontroller.
programmable error handling (see Section “High speed data interfacing”)
SAA7201
Audio
TXT
Subtitling
High speed
data
Section data
CRC calculation is performed in the filters. If an error is detected, an error flag
(bit err_stat, address 0x0305 to 0x0314, see Table 13) is set. The error
handling decision is left to the microcontroller.
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PDF描述 |
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| SAA7205H | MPEG-2 systems demultiplexer |
| SAA7206 | DVB compliant descrambler |
| SAA7206H | DVB compliant descrambler |
| SAA7216HS | Integrated MPEG AVGD decoders |
| SAA7221HS | Integrated MPEG AVGD decoders |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA7205H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:MPEG-2 systems demultiplexer |
| SAA7206 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DVB compliant descrambler |
| SAA7206H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DVB compliant descrambler |
| SAA7207H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Reed Solomon decoder IC |
| SAA7207H/C1 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Reed Solomon decoder IC |
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