參數(shù)資料
型號(hào)： 935264535557
廠商： NXP SEMICONDUCTORS
元件分類： 通信及網(wǎng)絡(luò)
英文描述： SPECIALTY TELECOM CIRCUIT, PQFP208
封裝： SOT-316, MQFP-208
文件頁(yè)數(shù)： 18/23頁(yè)
文件大?。?/td> 194K
代理商： 935264535557
1999 Jul 01
4
Philips Semiconductors
Product specication
Single Chip DAVIC/DVB-RC Cable Modem
VES1848
DQPSK DEMODULATOR
Fully digital variable bitrate demodulator used for the OOB channel. It implements a digital down conversion to
base band, filtering and decimation, frequency and clock recoveries as well as equalization. It also provides an
AGC command to the OOB tuner.
OOB CHANNEL PROCESSING
After descrambling, deframing and deinterleaving, ATM cells are fed into the RS decoder and corrected. A filtering
on ATM headers and MAC headers is then done on valid cells to keep only those addressed to the STB. MAC cells
and application layers cells are stored in 2 different FIFOs. Up to 4 different VPI-VCI can be filtered for application
layers data.
Mbits and Rxbits
(1) are also output after integrity checking.
For US synchronization, 3ms markers are generated.
IB CHANNEL PROCESSING
This block is fed with the outputs of a cable FEC decoder. It implements the filtering of the MAC data addressed to
the STB as well as valid time references and valid Rxbits filtering.
Mbits, Rxbits (after integrity checking) and MAC data are stored in a FIFO.
For US synchronization, 3ms markers are generated.
No PID filtering is done for application layers data.
This block implements the filtering of ATM cells transported in MPEG2-TS packet as defined by DAVIC. These data
are stored in the application layers FIFO and up to 4 different VPI-VCI can be filtered.
INTERFACES
MAC messages and application layers data are stored in different FIFOs. They can then be read/write with the
same or 2 different micro processor interfaces.
The VES 1848 registers are programmed with the MAC interface.
US SYNCHRONIZATION
This block decides when to send an US burst.
When the VES 1848 is used in a DVB/DAVIC device, this block also does the propagation delay compensation and
the US slot numbering. It uses information from the DS channel (Mbits, 3ms markers) and some provided by the
MAC layer (time compensation, slot number where to send a burst).
When the US path is used in a MCNS device, the burst start information is provided by the toggle of the external
synchro pin.
US CHANNEL ENCODING
It is DVB/DAVIC and MCNS compliant thanks to its burst profile programmation (6 different profiles can be stored
in the VES 1848).
Data read in FIFOs are RS encoded, randomized and differential encoded before the addition of a programmable
preamble.
BURST MODULATOR
Data can be output either in base band after predistorsion and nyquist filtering or directly on a programmable IF. In
that case a programmable sinewave can also be generated if required.
DAC
Two 10-bit Digital to Analog Converters are built in the VES 1848. The modulated data are provided on both analog
and digital outputs.
(1) refer to the DVB or DAVIC specification for the definition of Mbits and Rxbits.
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