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| 型号： | OM5721 |
| 厂商： | NXP Semiconductors N.V. |
| 英文描述： | STB5660 Set-Top Box STB concept |
| 中文描述： | STB5660机顶盒机顶盒的概念 |
| 文件页数： | 10/20页 |
| 文件大小： | 100K |
| 代理商： | OM5721 |
1999 May 05
10
Philips Semiconductors
Product specification
STB5660 (Set-Top Box) STB concept
OM5721
4
HARDWARE
4.1
IC list
Table 1
Description of system ICs
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,
I
2
C-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.
HARDWARE
DESCRIPTION
Channel module
SD1288MK2
TDA8044
Tuner
Satellite demodulator and decoder
Front panel board
87C524
Microcontroller
Main board
SAA7214
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
SAA7215
PDI1394L11
PDI1394P11
UDA1320
TDA8004
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
K
EYS
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).
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