SAA7240 データシートの表示（PDF） - Philips Electronics

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SAA7240

MPEG-2 Transport RISC processor

Philips Electronics 

Philips Semiconductors

MPEG-2 Transport RISC processor

Product specification

SAA7240

1.3 CPU-related features

The SAA7240 contains an embedded RISC CPU, which

incorporates the following features:

• A 32-bit PR3930 core, running at 81 MHz

• Support for large and small byte addressing modes; is

ready for Windows® (1)CE and pSOS® (2) operating

systems

• 8-kbyte 2-way set of associative instruction cache

• 4-kbyte 4-way set of associative data cache

• A programmable low-power mode, including wake-up

on interrupt

• A Memory Management Unit (MMU) with 32 odd/even

entries and variable page sizes

• Multiply/accumulate/divide unit with fast

multiply/accumulate for 16-bit and 32-bit operands

• Two fully independent 24-bit timers and one 24-bit timer,

including watchdog facilities

• A real-time clock unit (active in Sleep mode)

• Built-in software debug support unit as part of extended

JTAG debug interface

• On-chip SRAM of 4 kbytes for storing code that needs

fast execution.

1.4 MPEG-2 System Processor (MSP) features

• A flexible re-router to support many combinations of the

transport stream input/output interfaces:

– Connection to serial or parallel Common Interface IC

– Connection to serial or parallel 1394 IC in full-duplex

mode

– Static dual front-end handling of channel decoders

– A maximum frequency of up to 13.5 Mbytes/s in

parallel mode and up to 81 Mbits/s in serial mode.

• A demultiplexer scheme, which is fully compliant with

Canal+ and BSkyB specifications:

– Hardware-based parsing of transport, program and

proprietary software data streams. The maximum

input rate is 13.5 Mbytes/s in parallel mode and

81 Mbits/s in serial mode

– Up to 40, 13-bit Packet Identifier (PID) filters applied

on the PID value. 32 PID filters can be dedicated to

filter packets containing sections; four PID filters to

filter transport packets header; four PID filters to

parse audio, video, teletext and subtitle data

(1) Windows is a registered trademark of Microsoft Corporation

(2) pSOS is a registered trademark of Wind River Systems, Inc.

– 4 TS/PES packet header filters (filter condition of

3 bytes, including PID value for TS packet header

and specific filter condition for PES packet header)

– 32 section filters based on a flexible number of filter

conditions to retrieve PSI, SI, Private data and EPG,

etc. Each section filter supports 48 filters conditions

of 12 bytes; each filter condition can be negated or

masked on a bit level

– 7 ECM/EMM filters stored in on-chip RAM for ICAM

implementation (ECM/EMM packets are stored in

on-chip RAM)

– Flexible 40 channel DMA-based storage of the

32 section sub-streams and four TS/PES data

sub-streams and 4 TS/PES packet headers in

external memory

– System time base management with a double

counter mechanism for clock control and

discontinuity handling

– Two Presentation Time Stamp (PTS)/Decoding Time

Stamp (DTS) timers

– A General Purpose/High Speed (GP/HS) filter, which

can serve as an alternative input from IEEE 1394

devices, for example. The IEEE 1394 GP/HS mode

supports packet insertion and has an internal SRAM

for storing two packets. It can also output either

scrambled or descrambled TS to IEEE 1394 devices.

• A real time descrambler, supporting different

descrambler algorithms and consisting of four modules:

– A control word bank, containing 14 pairs (odd or

even) of control words and a default control word

– The DVB descrambler core, implementing the stream

decipher and block decipher algorithms

– The MULTI2 descrambler algorithm, implementing

the CBC and OFB mode descrambling functions.

In this mode, the maximum frequency is 9 Mbytes/s

(72 Mbits/s)

– The Integrated Conditional Access Module (ICAM),

including an ISO 7816 compliant UART to interface

the conditional access smart card.

1.5 Compatibility with other devices

The SAA7240 seamlessly interfaces to the integrated

MPEG AVGD decoder SAA7215HS. It is also backward

compatible with the other devices of the family. The

following modes/combinations are supported:

• SAA7240 with SAA7215HS seamless

• Pinning compatibility with the SAA7219HS.

2001 Oct 22

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