Mpif (Pnx 3000); Communication Channels; Analogue Vision If Processing - Philips 42PF9731D Service Manual

EN 160 9. BJ2.4U/BJ2.5U LA
POD Stand-by Mode
• POD stack still alive:
– Active Front-End.
– Active VIPER, Stby-uP.
• Allows the POD to request services:
– Listen to OOB.
– Firmware upgrade.
Connector
• Mechanical
– 68 pins PCMCIA connector.
– Voltage keying (LV type).
– Type I, II, III.
• Hot plug ability
– Initial, V is applied to the socket.
CC
– Card detection (CD1 & CD2 = low).
– Voltage sense pins (VS1 & VS2).
– Power controller to set V
• CIS structure
– All PCMCIA cards have a CIS structure.
– Information about size, speed, functions, ...
– Distinguish between PC-card and Cable-card.
– Before reading the CIS, the PCMCIA driver is in an 8-
bit memory card mode with reduced address- and
control lines (only purpose is to read the CIS).
– After reading the CIS, there is a personality change
and the driver is ready to communicate with a Cable-
card.
– Once a card's client driver successfully parses the CIS
and obtains the system resources required by the card,
it assigns the resources to the card via the COR
(Configuration Option Register).
MPEG-2
TRANSPORT
STREAM
POD
INTERFACE
LOGIC
OUT OF BAND
SERIAL DATA
COMMAND
INTERFACE
PCMCIA
CONNECTOR
Figure 9-14 Example of POD design
9.5.3

Communication Channels

In Band (IB)
• Forward Application Transport channels (FAT):
– 256 QAM modulation (8 bits/symbol).
– 54 - 864 MHz.
– 6 MHz bandwidth.
– Carry information via MPEG-2 streams.
– Scrambled In-Band Channels.
– TS packet header.
– In-the-Clear channels.
• NTSC analog channels:
– 8-VSB modulation (3 bits/symbol).
– 54 - 806 MHz (UHF and VHF)
– 6 MHz bandwidth.
– Not via POD, but via MPIF.
– With VBI (Vertical Blanking Interval) signals for closed
captioning.
Out Of Band (OOB)
• Forward Data Channels (FDC):
– DQPSK modulation (2 bits/symbol).
– 70 - 130 MHz.
– 6 MHz bandwidth.
– Spaced between 6 MHz FAT and analog channels.
Circuit Descriptions, Abbreviation List, and IC Data Sheets
and V .
CC PP
COPY
MPEG-2 PROTECTION
TRANSPORT ENGINE
DEMULTIPLEXER
AND
PAYLOAD
REMULTIPLEXER
DECRYPTION
ENGINE
SECURE
OUT OF BAND
uP
CPU
PROCESSING
MEMORY CONTROLLER
FLASH RAM
POD MODULE
F_15400_075.eps
– Control and Access messages.
– Application code download.
– Only from cable operator towards user.
– Service Information (SI) like:
–
–
–
–
– Emergency Alert Service (EAS)= US federal system
for alerting the public to emergencies; works before
and after CableCARD insertion
9.6

MPIF (PNX 3000)

9.6.1 Introduction
The MPIF (Multi Platform InterFace, type number PNX3000,
item number 7C00) is an analog video and audio pre-
processing unit for the AVIP TV processor. It contains the high
frequent IF part and all the analog video and audio source
switching for external in- and outputs. The MPIF can handle
CVBS, Y/C, RGB (1fH/2fH) and YPbPr (1fH/2fH) video signals
as well as stereo, I
MPIF converts the selected video and audio streams from the
analog to the digital domain. Via three high-speed serial data
2
links (I D), the digitized audio and video signals are streamed
(594 Mbit/s) to the AVIP IC for further processing.
The MPIF uses a clock coming from the AVIP of 13.5 MHz and
2
is I C driven. The supply voltage for the MPIF is 5V.
The MPIF uses the following input signals:
• CVBS, Y/C, YPbPr, or RGB video format.
• 1fH or 2fH video.
• Clock 13.5 MHz from the AVIP.
2
• I C from the VIPER.
• Clamping-pulse from the AVIP.
9.6.2 Block Diagram
Following figure shows the MPIF block diagram:
100505
Video
Video
IF
IF Processing
Video
Base
band
Sound
Sound IF
IF
Processing
Sound
low-IF
AM
Demod.
Audio
Base
band
9.6.3 IF Processing
The MPIF is capable of demodulation of RF signals.

Analogue Vision IF Processing

Some specifications:
• Synchronous demodulation of the IF vision carrier.
Selectable frequency and auto-calibration of the VCO
(Voltage controlled oscillator).
• Group delay correction for BG system.
PMT: TS Program Map Table.
PAT: Program Association Table.
CAT: Conditional Access Table.
STT: System Time Table.
2
S, and second sound IF audio signals. The
Control
CVBS_out
Video
Video
output
ADC
Selection
Video
Source
Selection
Sound
Sound
2nd IF
IF ADC
Selection
Audio Audio
Base band Base band
Selection ADC
Audio
Output Clocking
Selection
LR_out
Figure 9-15 MPIF block diagram
Video Sound
I2D
Multi-
I2D I2D
Link
plexer
I2C
I2C
Interface
CL 36532058_065.eps
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