SAA7215HS/C2 Просмотр технического описания (PDF) - Philips Electronics

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SAA7215HS/C2

Integrated MPEG AVGD decoders

Philips Electronics 

Philips Semiconductors

Integrated MPEG AVGD decoders

Preliminary specification

SAA7215; SAA7216; SAA7221

FEATURES

General features

• Integrated MPEG AVGD decoder: audio, video and

graphics decoding and digital video encoding

• 5 planes display chain: background colour, background

plane, MPEG display plane, graphics plane and cursor

plane

• 16-Mbit or 32-Mbit external Synchronous DRAM

(SDRAM) for MPEG audio and video decoding and

graphics data storage

• Single or double external SDRAM organized as

1 M × 16 or 2 × 1 M × 16 (two independent 16-bit data

bus) interfacing at 81 MHz. Due to efficient memory use

in MPEG decoding, more than 1 Mbit is available for

graphics in the single SDRAM configuration whereas

17 Mbits are available in the double SDRAM

configuration.

• All basic operations of the AVGD decoder are possible

in both 16- and 32-Mbit configuration; enhanced

performance is achieved by the use of 32-Mbit external

SDRAM

• Targeted to BSkyB 3.0 and Canal+ basic box and web

box specifications

• Fast 16-bit data + 22-bit address synchronous or

asynchronous interface with external controller at up to

40.5 MHz

• Dedicated input for compressed audio and video in

Packetized Elementary Stream (PES) or Elementary

Stream (ES) in byte wide or bit serial format.

Accompanying strobe signals distinguish between audio

and video data. Transport stream error correction

available.

• Audio and/or video can also be input via the CPU

interface in PES or ES in 8 or 16-bit parallel format

• Single 27 or 40.5 MHz external clock for time base

reference and internal processing. Internal system time

base at 90 kHz can be synchronized via CPU port.

All required decoding and presentation clocks are

generated internally.

• Flexible memory allocation under control of the external

CPU enables optimized partitioning of memory for

different tasks

• Optimum compatibility with T-MIPS controller family

(SAA7214, SAA7219 and successors)

• Boundary scan testing implemented

• External SDRAM self test

• Supply voltage: 3.3 V; package: SQFP208.

CPU related features

• 16-bit data, 22-bit address, Chip Select, Data Strobe

and DaTa ACKnowledge external control protocol

• Fast 16-bit data plus 22-bit address synchronous

interface with the SAA7214, SAA7219 family at up to

40.5 MHz

• Asynchronous interface possible with external

microcontroller

• Support of fast DMA transfer

• Flexible bidirectional interface to external SDRAM

• High speed/low latency interface with second graphics

SDRAM

• Byte access to the full SDRAM in the upper 16-Mbit

address range

• Independent memory mapping of SDRAM and control

registers

• Two programmable independent interrupt lines

available

• Supports Motorola 68xxx interfaces as well as LSI

L64108 interface.

MPEG-2 system features

• Parsing of MPEG-2 PES and MPEG-1 packet streams

• Double system time clock counters

• Stand-alone or supervised audio/video synchronization

• Processing of errors flagged by channel decoding

section.

MPEG-2 video features

• Decoding of MPEG-2 video up to main level, main profile

• Output picture format: CCIR-601 4 : 2 : 2 interlaced

pictures. Picture format 720 × 576 at 50 Hz or 720 × 480

at 60 Hz.

• Support of constant and variable bit rates up to

15 Mbits/s for the elementary stream

• Horizontal and vertical pan and scan allows the

extraction of a window from the coded picture

• Flexible horizontal scaling from 0.5 up to 4 allows easy

aspect ratio conversion including support for 2.21 : 1

aspect ratio movies; in case of shrinking an anti-aliasing

pre-filter is applied

2000 Jan 31

2

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