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參數資料
| 型號： | 935264530157 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | SOT-317, MQFP-100 |
| 文件頁數： | 40/43頁 |
| 文件大小： | 254K |
| 代理商： | 935264530157 |
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1999 March 01
6
Philips Semiconductors
Product specication
Single chip DVB-C channel receiver
VES1820X
Next, the RAM memory associated with the deinterleaver fills up and the first deinterleaved bytes are provided to
the input of the Reed-Solomon decoder. The state machine of the de-interleaver goes to the control phase which
counts
β consecutive missed MPEG2 sync words (or sync ) before declaring the system desynchronized and
going back to the synchronization phase.
α and β are programmable through the I2C interface.
When the inverted sync word is detected at the input of the de-interleaver, the bytes provided to the Reed-
Solomon decoder are inverted at the output of the deinterleaver.
REED-SOLOMON DECODER
The Reed-Solomon decoder decodes the symbol stream from the de-interleaver according to the (204, 188)
shortened Reed-Solomon code. Synchronization to Reed-Solomon code is defined over the finite Galois field GF
(2
8). The field generator polynomial is given by :
G(x) =
i=0
15
p (x+a i)
This Reed-Solomon decoder corrects up to eight erroneous symbols in each block. When the correction
capability of the decoder is exceeded, the block is not changed and is provided as it has been entered. In this
case the flag UNCOR is set and the MSB of the second byte in the MPEG2 frame is forced to one (error
indicator). The correction capability of the RS decoder can be inhibited.
DESCRAMBLER
In order to comply with energy dispersal requirements of radio transmission regulations and to ensure adequate
binary transitions, the MPEG2 frames are scrambled at the encoder side. Dual operation is achieved at the
output of the Reed-Solomon decoder using the same scrambler/descrambler. The polynomial for the pseudo
random binary sequence (PRBS generator is 1 + x
14
+ x
15
. The PRBS registers are initialized at the start of every
eight transport packets. To provide an initialization signal for the descrambler, the MPEG2 sync byte of the first
transport packet is inverted from 47
16
to B8
16
. When detected, the descrambler is loaded with the initial sequence
"100101010000000". The descrambler can be inhibited.
INTERFACE
The VES1820X integrates an I2C interface in slave mode. This I2C interface fulfills the Philips component I2C
bus specification.
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