The MVD_DVB-S modulator includes all the
processing functions between the MPEG_TS input
and the DAC. It can be parameterized by using a
very simple microprocessor like interface.
Real Time Controller & Null packet
inserter
Energy dispersal
Reed-Solomon encoder
Convolutional Interleaver
FEC Convolution Encoder
I & Q RCC Filter
DAC Sample rate Interpolation
Adjustable Intermediate Frequency by
Digital Up Converter
MVD
optional modules
Ethernet UDP Receiver (10/100/1000)
Up to 300 Mbit/s+ input rate
Available for Virtex-5™,
Virtex-4™ and
Spartan™-3/E/A
ASI Receiver
270 Mbit/s input
Auto data rate
MPEG Frame recovery
One to one interface with RTC
Module
Modulator Controller Interface.
Provides support to dynamically
setup all modulator parameters.
DAC Setup Module
Provides support for DAC setup
and calibration
Features
Ready to use DVB-S compliant modulator core
For Virtex-5, Virtex-4 and Spartan-3/E/A
FPGAs
Flexible input and symbol rates
Supported modes :
Null Packet inserter Mode (User
defined symbol rate)
Genlock Mode (Symbol rate
automatically defined by the
input rate)
Fully optimized single channel version
Single clock (up to140 MHz+ for
Spartan-3™,270 MHz+ for
Virtex-4/5™
MVD provides a wide choice of options for support
: Optional companion cores, design services, on
site or remote support as well as on site
training.
The block diagram shows the basic
modulator implementation. The RTC and Null Packet
Inserter module provides the necessary timing and
frame resynchronization to the modulator, please
refer to DVB-S documentation to a detailed DVB-S
encoder process and DVB-S core's functional
description.The modulator includes a dual channel
RRC Filter plus a dual channel multi-rate
interpolation. Both modules limit the
intermediate frequency bandwidth and re-sample
the symbol rate to match the DAC input data
rate.The DUC is dynamically adjustable and
provides a direct interface with the external DAC
(no glue logic is used).Detailled information
available on request.
