L64777 LSI Logic Corporation, L64777 Datasheet - Page 12

• Manufacturer Part Number: L64777
• Description: DVB Qam Modulator
• Manufacturer: LSI Logic Corporation

1.2 Operating Environment
Figure 1.1
1-2
QPSK Satellite Receiver
MPEG Transport MUX
Transmission Network
L64777 Operating Environment
The modulator is intended to follow either an MPEG transport stream
source (for example, a transport multiplexer) or a satellite receiver, such
as the LSI Logic L64724 (see Figure 1.1). It processes MPEG-2 system-
compliant frames at the input.
You can program the sync word and block length, and the chip can
reinsert the sync information. The device handles the MPEG-specific
transport-packet error indication (TEI) bit internally.
The features of the L64777 include:
Introduction
DVB standard ETS 300 429-compliant modulation operation
Highly integrated global synchronization and clock control
On-chip VCO to support symbol rates up to 10 Msymbols/s
Digital NCO and interpolation mode to support operation with the
L64724
Four-fold Nyquist filter oversampling
Maskable interrupts for all error conditions
Individual module bypass configuration modes
I and Q baseband outputs both in digital and analog formats
I
various chip parameters
User-controllable input synchronization schemes
16, 32, 64, 128, and 256 QAM modes
Reed-Solomon encoder
2
MPEG Transport
Stream (Digital)
C-compatible serial interface for control, setup, and monitoring of
Modulator
L64777
QAM
Modulated I and Q
Analog QAM
Components
Mixer
RF
Network
Cable