SAA7214 データシートの表示（PDF） - Philips Electronics

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SAA7214

Transport MPEG2 source decoder

Philips Electronics 

Philips Semiconductors

Transport MPEG2 source decoder

Preliminary specification

SAA7214

• System time base management with a double counter

mechanism for clock control and discontinuity handling

• 2 PTS/DTS timers

• A GP/HS filter which can serve as alternate input from

for example EEE1394 devices. It can also output either

scrambled or descrambled TS to IEEE 1394 devices.

APPLICATIONS

• Digital television decoder environment.

GENERAL DESCRIPTION

SAA7214 system overview

The device is part of a comprehensive source decoding kit

which contains all the hardware and software required to

receive and decode MPEG2 transport streams, including

descrambling, demultiplexing. In addition, it includes a

MIPS PR3001 RISC CPU core and several peripheral

interfaces such as UARTs, I2C-bus units, and an

IEEE 1284 (Centronics) interface. The SAA7214 is

therefore capable of performing all controller tasks in

digital television applications such as set-top boxes.

The SAA7214 is compliant to DVB specification.

The 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 algorithm,

on the basis of 6 control word pairs stored in on-chip RAM.

Demultiplexing is subsequently applied to the stream, to

separate up to 32 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 are selected and stored in

external memory, for subsequent off-line processing by

the internal PR3001 CPU core.

To support advanced board testing facilities, the SAA7214

includes boundary scan test hardware, in accordance with

the JTAG standard. The device features a low-power

sleep mode, which is capable of sustaining set-top box

standby functionality, thus eliminating the need for a

separate front-panel controller. The SAA7214 requires a

supply voltage of 3.3 V and some devices input and output

interfaces are 5 V tolerant. The device is mounted in a

SQFP208 package.

2001 Mar 28

3

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