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參數(shù)資料
| 型號(hào)： | MT312 |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Satellite Channel Decoder |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | MQFP-80 |
| 文件頁數(shù)： | 14/90頁 |
| 文件大小： | 318K |
| 代理商： | MT312 |
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MT312
Functional Overview
14
1.4.4 The Reed Solomon Decoder Block
DVB and DSS data are encoded using shortened
versions of the Reed-Solomon code of block length
255, containing 239 message bytes and 16 check
bytes, that is (255,239) with T = 8. Both encoders
use the same generator polynomial. The code block
size for DVB is 204 and that for DSS is 146. Hence
DVB code is (204, 188) and DSS code is (146, 130),
with both having T = 8. The block structure of the
DVB and DSS Reed-Solomon codes are as shown in
Figure 9 and Figure 10 below.
The Reed-Solomon decoder can correct up to eight
byte errors per packet. If there are more than 8 bytes
containing errors, the packet is
fl
agged as
uncorrectable using the pin BKERR. In the case of
DVB the transport error indicator (TEI) bit of the
MPEG packet is set to 1, if setting of TEI is enabled.
1.4.5 The Energy Dispersal (De-Scrambler)
Block, DVB only
Before Reed Solomon encoding in the DVB
transmission system, the MPEG2 data stream is
randomised using the con
fi
guration shown in Figure
11 below. This is a Pseudo Random Binary
Sequence (PRBS) generator, with the polynomial:
1 + X
14
+ X
15
The PRBS registers are loaded with the initialisation
sequence as shown, at the start of the
fi
rst transport
packet in a group of eight packets. This point is
indicated by the inverted sync byte B8hex. The
normal DVB sync byte is 47hex. The data starting
with the
fi
rst byte after the sync byte is randomised
by exclusive-ORing data bits with the PRBS. (The
sync bytes themselves are not randomised).
In the decoder, the process of de-randomising or de-
scrambling the data is exactly the same as described
above. The de-scrambler also inverts the sync byte
B8hex so that all MPEG output packets have the
same synch byte 47hex.
Sync byte
187 bytes
MPEG transport packet
Sync byte
187 bytes
Reed Solomon encoded block
16 check bytes
Figure 9 - DVB block structure
Figure 10 - DSS block structure
130 bytes
DSS transport packet
130 bytes
Reed Solomon encoded block
16 check bytes
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