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参数资料
| 型号： | OM5730 |
| 厂商： | NXP Semiconductors N.V. |
| 英文描述： | STB5860 (Set-Top Box) STB concept(STB5860机顶盒初步设计) |
| 中文描述： | STB5860（机顶盒）机顶盒的概念（STB5860机顶盒初步设计） |
| 文件页数： | 6/20页 |
| 文件大小： | 80K |
| 代理商： | OM5730 |
1999 Aug 25
6
Philips Semiconductors
Preliminary specification
STB5860 (Set-Top Box) STB concept
OM5730
2.2
Reference design goal
The Philips STB concept STB5860 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 SAA7219 transport MPEG
source decoder and the SAA7215 family 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
thesemiconductorproviderstooffercompetitivesolutions,
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
K
EY SYSTEM BENEFITS
STB5860 offers a good compromise between flexibility,
performance and integration of functions which leads to
a very attractive price/performance offer.
The SAA7219 performs the descrambling,
demultiplexing and control of the STB while the
SAA7215 family performs the media processing
functions such as MPEG2 audio video and graphics
processing.The communicationbetweenthetwo ICsas
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
K
EY
IC
BENEFITS
SAA7219 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 the SAA7219, 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)
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