Philips 32PF7320A/37 Service Manual Download Page 116

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Circuit Descriptions, Abbreviation List, and IC Data Sheets

EN 116

BP2.2U, BP2.3U

–

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.

–

Card detection (CD1 & CD2 = low).

–

Voltage sense pins (VS1 & VS2).

–

Power controller to set V

and 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).

•

POD pinning.

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.

–

Control and Access messages.

–

Application code download.

–

Only from cable operator towards user.

–

Service Information (SI) like:
–

PMT: TS Program Map Table.

–

PAT: Program Association Table.

–

CAT: Conditional Access Table.

–

STT: System Time Table.

–

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

S, and second sound IF audio signals. The

MPIF converts the selected video and audio streams from the
analog to the digital domain. Via three high-speed serial data
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
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.

•