OM5721 データシートの表示（PDF） - Philips Electronics

部品番号

コンポーネント説明

メーカー

OM5721

STB5660 (Set-Top Box) STB concept

Philips Electronics 

Philips Semiconductors

STB5660 (Set-Top Box) STB concept

Product specification

OM5721

2.2 Reference design goal

The Philips STB concept STB5660 is a reference design

of a complete hardware and software solution intended for

the digital satellite receiver Set-Top Box market. This

reference design addresses the potential customer base

who is targeting the new world of digital media

broadcasting. The reference platform for a Set-Top Box

combines the key ICs, the SAA7214 transport MPEG

source decoder and the SAA7215 AVG decoder/video

encoder, and the software to run a Set-Top Box.

As in many cases a platform is a stepping stone from

which evolution and specification enhancements can be

launched. The first reference design of the platform

contains the necessary functions which demonstrate the

performance and capabilities of the system.

Enhancements in the ICs as well as for SW modules will

be released during the lifetime of the platform.

The convention which has been used is that backwards

compatibility is guaranteed within the platform (STB5000

range).

The main objectives are:

• Firstly providing this complete system, greatly reduces

the required investments needed in scarce design

resources, and helps customers focus on building a

position and responding quickly to the market demand

• Secondly, an advantage of the reference design

approach is that the system consisting of complex

functions realized in silicon and software can be

validated in tangible results

• Thirdly, to create a stable platform from which

customized solutions can be derived faster.

It is expected that in the coming years the market will grow

in all segments, satellite, cable and terrestrial; and that the

captive broadcasters gradually open up their system,

focusing more on the services rather then the contents of

the box. Their service role at the beginning is to create the

market by having box content, then it will change towards

the real core service activities bringing content and new

services to the home.

This changing behaviour of the service providers calls for

the semiconductor providers to offer competitive solutions,

enabling the future dreams of the service providers. This

implies that in order to plan the evolution of the Set-Top

Box functionality, one must be positioned and in control of

the whole system.

2.3 Benefits

2.3.1 KEY SYSTEM BENEFITS

• STB5660 offers a good compromise between flexibility,

performance and integration of functions which leads to

a very attractive price/performance offer

• The SAA7214 performs the descrambling,

demultiplexing and control of the STB while the

SAA7215 performs the media processing functions such

as MPEG2 audio video and graphics processing.

The communication between the two ICs as well as the

memory partitioning and management have been

designed so that a true unified memory concept can be

implemented with no performance degradation.

• Within the STB family of products, HW and SW

footprints will be maintained to ensure the maximum

possible reuse of resources

• Philips offering the most comprehensive portfolio of ICs

combined with our well known technological capabilities

brings the best on a complete system level. This in

combination with our local technical support centres

gives the customer a fast and secure inroad to the new

field of emerging technology.

2.3.2 KEY IC BENEFITS

• SAA7214 incorporates a low cost high performance

32 bits MIPS processor with 4 kbytes instruction cache

and 1-kbyte data cache. In addition a 4-kbyte

second-level cache, designed for SW optimization but

can also be used for ‘last minute’ CPU intensive

software patches is offered to software developers,

boosting application performance.

• A flexible hardware/software partitioning and

optimization for DVB TS demultiplexing has been

designed targeted to Canal+ specification. This

partitioning makes parsing of incoming stream in

hardware, in order to off-load the processor and makes

most of the processing from system memory by the

MIPS processor, which leaves to software developers

the freedom to allocate the right priority at the

application level for MPEG system data handling.

• All required DVB/MPEG2 system services are covered

by SAA7214, such as full DVB descrambling, section

filtering with 32 PIDs handled in hardware and more if

required in software, TS/PES filter for maximum

flexibility in the service handling and edition (time base

discontinuity)

1999 May 05

6

Share Link: