OM5721 데이터 시트보기 (PDF) - Philips Electronics

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OM5721

STB5660 (Set-Top Box) STB concept

Philips Electronics 

Philips Semiconductors

STB5660 (Set-Top Box) STB concept

Product specification

OM5721

4 HARDWARE

4.1 IC list

Table 1 Description of system ICs

HARDWARE

DESCRIPTION

Channel module

SD1288MK2 Tuner

TDA8044 Satellite demodulator and decoder

Front panel board

87C524

Microcontroller

Main board

SAA7214

SAA7215

PDI1394L11

PDI1394P11

UDA1320

TDA8004

Descrambler, demultiplexer and MIPS

core

Audio, video, graphics and digital

encoder

Link and physical layer of 1394

Link and physical layer of 1394

Audio DAC

Smart Card Interface

4.2 Main board

4.2.1 SAA7214

The SAA7214 (TMIPS) is a transport MPEG2 source

system decoder it includes a MIPS R3000 microcontroller

core and several peripheral interfaces such as UARTs,

I2C-bus units, an IEEE 1394, and an IEEE 1284

(Centronics) interface.

SAA7214 receives transport streams through a versatile

stream input interface capable of handling both

byte-parallel and bit-serial streams, in various formats,

supporting data streams up to and including 13.5 Mbytes/s

(108 Mbits/s). The stream data is first applied to an on-chip

descrambler incorporating DVB descrambling algorithms,

on the basis of 6 control word pairs stored in on-chip RAM.

Demultiplexing is subsequently applied to the stream, to

separate up to 40 individual data streams.

The demultiplexer section includes clock recovery and

timebase management.

Program Specific Information (PSI), Service Information

(SI), Conditional Access (CA) messages and private data

is selected and stored in external memory, for subsequent

off-line processing by the internal R3000 microcontroller

core.

4.2.2 SAA7215

The SAA7215 is a MPEG2 source decoder which

combines audio decoding and video decoding.

Additionally to these basic MPEG functions it also provides

means for enhanced graphics, background display and/or

on-screen display as well as encoding of output video.

Due to an optimized architecture for audio and video

decoding, maximum capacity in external memory and

processing power from the external CPU is available for

graphic support.

4.3 Front-end

The front-end allows reception of channels transmitted by

satellite received via a satellite dish in combination with a

Low Noise Blockdown (LNB). The Outdoor unit can be

controlled with:

• 0FF/14 V/18 V pouring for polarisation steering

• 22 kHz tone switching control for band switching

• Digital Satellite Equipment Control (DiSEqC) V1.0.

4.4 Front panel

4.4.1 LNB INTERFACE

Master transmitter DiSEqC is provided and 14/18 V

switching this is routed through the digital board to the

front-end utility connector. The possibility to disable the

DiSEqC on the front panel, allows for the next generation

Quatro Phase Shift Key (QPSK) front-end which will have

DiSEqC.

4.4.2 IR

The on-board microcontroller decodes the IR commands

in RC5/6 format and relays via the serial link to the

SAA7214.

4.4.3 KEYS

STANDBY, UP, DOWN, LEFT, RIGHT, OK, MENU

4.4.4 SCART CONTROL

Pin 8 control as per the SCART specification for 16 × 9

and 4 × 3.

Pin 16 control as per SCART specification for RGB fast

blanking (in this case used to switch between RGB and

composite).

1999 May 05

10

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