CXD1959 [ETC]
Set-Top Box Using the Sony CXD1959 ; 机上盒使用了索尼CXD1959\n
| 型号： | CXD1959 |
| 厂家： | 
ETC |
| 描述： | Set-Top Box Using the Sony CXD1959
|
| 文件： | 总4页 (文件大小：175K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Set-Top Box Using the Sony CXD1959
(POD-Host) defines the subscriber terminal equip-
Introduction
The cable industry is evolving rapidly and cre-
ment as consisting of a navigation device (set-top)
and an external module called point-of-deploy-
ment (POD). The set-top- box (STB) consists of
the necessary electronics to transport and convert
broadcast signal from the plant facilities to the
subscriber. An intelligent "host" inside the STB
also communicates with the plant facilities to
direct and steer the services. The POD is a detach-
able device, which could be in the form of a PC
card that plugs into a PCMCIA slot on the STB.
This POD module is a renewable and replaceable
device that addresses the issues of Conditional
Access/Security functions, as well as the signaling
functions. One of the purposes of the POD
module is to allow the service providers to
change/upgrade their conditional access and secu-
rity functions as newer technology becomes avail-
able without changing the STB. This allows the
STB to become a more standard device that
can be manufactured by multiple sources,
resulting in competition and thus, low-cost STB.
OpenCable architecture (www.opencable.com).
ating a new generation of services to consumers.
Examples of these new services are video-on-
demand and high speed Internet access. The
FCC’s 1996 Telecom Reform Act requires the
cable industry to have the retail availability of the
cable subscriber terminal equipment to assure
competition and availability of set-top-boxes for
the benefit of consumers. CableLab was formed to
create OpenCable specifications that define inter-
faces between Hybrid Fiber Coax (HFC) plant
facilities and OpenCable terminal equipment. The
goal of these specifications is to achieve a high
degree of interoperability across cable systems in
North America.
The FCC also mandated the separation of
security and navigation functions in terminal
equipment by July 2000. In addition, the FCC
requires that cable operators stop deploying set-
top-boxes with integrated security function after
January 2005. One OpenCable specification
Set-Top Box
NTSC/
PAL
MPEG-2
Dolby AC3
AV
Transport
Stream
Demux
Cable
Tuner
DEMOD
TV
e
Audio
DAC
Decoder
OOB
I/F
Host
µC
Decryption
Encryption
OOB
Descrambler
POD
Figure 1. Subscriber Terminal Equipment (Set-top Box)
–1–
©Copyright 2001, Sony Electronics Inc. All rights reserved.
Another OpenCable specification, OpenCable
Applications Platform (OCAP), defines the soft-
ware layer (middleware) for the STB that makes
applications and services portable regardless of
the hardware or operating system software. The
combination of POD and OCAP enables the
development of an open market for STB platform
vendors to receive services independent of the
cable operators.
SCTE-DVS178r3 are implemented in the POD
Module.
CPU Interface
With OOB traffic included, the POD Module
requires more bandwidth and connections on the
CPU Interface than are supported by the Data
Channel alone. Two communication paths share
the same pins on the PC Card connector.
The POD provides the following functions:
Data Channel – This channel is compliant
with the Command Interface protocol of SCTE-
DVS064 Part B, plus the interrupt mode exten-
sion. Applications use this path when they require
support from either Host or POD Module
resources.
– Choice of digital broadcast security
– Choice of scrambling system
– Choice of out-of-band signaling
PC Card Compliance
The POD Module interface is registered to the
PC Card Standard as the POD Module
Extended Channel – This second communica-
tion channel only includes physical and link lay-
ers.
Custom Interface with the interface ID num-
ber (STCI_IFN) allocated to equal hexadecimal
341. If the Host is not capable of operating with
the POD Module, the Host will ignore the POD
Module. The POD Module presents the 16-bit PC
Card memory-only interface after an application
of VCC or the RESET signal. When operating in
this configuration, D7-D0 is retained as a byte-ori-
ented I/O port, and the capability to read the
Attribute Memory is retained.
The purpose of the Extended Channel is to
provide a communication path between the POD
Module and the Host such that applications in one
(e.g. Host, POD Module) can communicate with
the headend via a link layer or modem function in
the other (POD Module, Host), respectively.
While the content and format of the messages for
the Data Channel are well defined, the content
and format of the messages for the Extended
Channel are application-specific.
Host-POD OOB Interface
OpenCable requires support for out-of-band
(OOB) signaling. The Host RF front-end specifi-
cation provides the QPSK physical layer to
support OOB (downstream and upstream)
communications according to SCTE-DVS167r2
and SCTE-DVS178r3. The data link and media
access control protocols for SCTE-DVS167r2 and
–2–
SONY CXD1959 POD Solution
• 68K type host interface (asynchronous)
The Sony CXD1959 POD controller resides in
the STB and delivers most of the functions that are
required to control the external POD module in a
single chip. In particular, the CXD1959 provides
the following POD interfaces required by the
OpenCable specification:
• Current overload input (automatic POD isola-
tion) 32 concurrent PID filters with odd/even
key pairs (32 key pairs in total)
• TS switch integration includes: Two parallel
TS input interfaces for connection to front-end
(FEC) and POD outputs; Parallel TS output
interface for connection to POD
• Single Slot POD (or CAM) Interface
• Compliant with SCTE DVS131, NRSS-B
(SCTE IS-679 B), DAVIC v1.2 (CAO inter-
face) & DVB-CI (CENELEC EN-50221)
• Programmable Parallel/Serial TS output inter-
face for connection to transport processor
• Integrated hardware hot-swap support
• Integrated DES ECB and DES CBC
(DVS042) decryption cores
• Control logic to support external address bus
and OOB (out-of-band) buffers
• Integrated DVB common descrambler core
Set-top Box
Host
CPU
Cable
Signal
O/P
Signal
POD INTERFACE
CONTROLLER
(CXD1959R)
CP
FRONT
END
TRANSPORT
Decipher
DEMUX
PCMCIA Interface
Copy Protected
De-
scrambler
CP
Cipher
Scrambled
Clear
POD MODULE
Figure 2. Typical CXD1959 Usage Inside STB
–3–
The CXD1959 provides the interface between
a host CPU and the PC Card (e.g. POD). The host
is able to configure the interface and read and
write to the PC Card. The PC Card is one of two
types: memory or I/O (e.g. POD). Memory cards
are supported, as described in PC Card Standard,
and POD modules as described in DVS131. The
scrambled Transport Stream (TS) from the front-
end demodulator is switched to a detachable CA
module where it is descrambled and DES encrypt-
ed (copy protected) before being passed across the
slot (PCMCIA) and back into the CXD1959R
where it is decrypted and output "in-the-clear" to
the transport processor. The basic operation is
illustrated in figure 2.
One of the key benefits of the CXD1959R is
the serial transport stream (TS) option, which will
reduce signal routing complexity on the printed
circuit board. Another key benefit is Hot Swap
Engine feature that provides the hot swap capabil-
ity without software intervention. In addition, the
Des/DVB options provide encryption capabilities
that satisfy both the European and North
American requirements.
Photo 1. CXD1959 Evaluation Board
year, additional higher layer (Link, transport, ses-
sion and applications) software will be available
from Sony. Together, this will be a complete refer-
ence design for the STB, further shortening the
time-to-market factor.
Cxd1959 Evaluation board
Sony also offers an evaluation platform for
customers to speed up their design and develop-
ment process. A software device driver is provid-
ed with the evaluation board (shown Photo 1) to
minimize the effort of the customer. Later this
–4–
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