SAA7221 データシートの表示（PDF） - Philips Electronics

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SAA7221

Integrated MPEG AVGD decoders

Philips Electronics 

Philips Semiconductors

Integrated MPEG AVGD decoders

Preliminary specification

SAA7215; SAA7216; SAA7221

• Vertical scaling with fixed factors 0.5, 0.75, 1 or 2;

factor 0.5 realizes picture shrink. Factor 2 can be used

for up-conversion of pictures with 288 (240) lines or

less; factor 0.75 is used for letterbox presentation.

• Horizontal and vertical scaling can be combined to scale

pictures to 1⁄4 of their original size, thus freeing up

screen space for graphic applications like electronic

program guides

• Non full screen MPEG pictures can be displayed in a

box of which position and background colour are

adjustable by the external microcontroller; structured

background is available as part of the graphic features

• Nominal video input buffer size for MP at ML 2.7-Mbit

• Video output may be slaved to internally (master)

generated or externally (slave) supplied

HV synchronization signals or CCIR-656 contained

synchronization signals. The position of active video is

programmable. Display phase is not affected by MPEG

timebase changes.

• Decoding and presentation can be independently

handled under CPU control

• Various trick modes under control of external

microcontroller:

– Freeze field/frame on I- or P-frames; restart on

I-picture

– Freeze field on B-frames; restart at any moment

– Scanning and decoding of I- or I- and P-frames in a

IBP sequence

– Single step mode

– Repeat/skip field for time base correction

– Repeat/skip frame for display parity integrity.

• Synchronization modes: DTS controlled, DTS free

running, software controlled, buffer controlled

• DTS register can be set via external controller;

programmable processing delay compensation.

MPEG-2 audio features

• Supported audio sampling frequencies:

48, 44.1, 32, 24, 22.05 and 16 kHz

• Independent channel volume control and programmable

inter-channel crosstalk through a baseband audio

processing unit

• MPEG audio decoder

– Decoding of 2 channels, layer I and II MPEG-1 audio

and low sampling frequency extension of MPEG-2

– Supports for mono, stereo, intensity stereo and dual

channel mode

– CRC error detection with automatic mute

– Constant and variable bit rates up to 448 kbit/s

– Selectable output channel in dual channel mode

– Storage of last 54 bytes in ancillary data field

– Dynamic range control at output.

• Muting possibility via external controller; automatic

muting in case of errors

• Generation of ‘beeps’ with programmable tone height,

duration and amplitude

• Linear PCM decoding

– Support for up to 8 channels linear PCM elementary

audio streams

– Supports for 8, 16, 20 and 24 bit/sample

– Supports for bit rates up to 6.144 Mbit/s

– 96 kHz LPCM samples will be mapped to a 48 kHz

multi-channel format

– Volume control for linear PCM samples in three

steps: −6, −12 and −18 dB.

• Burst-formatting for interconnection with an external

multi-channel decoder

– AC-3 elementary streams (IEC1937)

– MPEG-2 multi-channel streams in ES or PES format

– Output via the digital audio output or the IEC 958

output.

• Output stage

– Global control for volume and balance

– Serial multi-channel digital audio output with 16, 18,

20 or 22 bits per sample, compatible either to I2S or

Japanese formats; output can be set to high

impedance mode via the external controller

– IEC958 (Serial SPDIF) audio output; output can be

set to high impedance mode

– Clock output 256 or 384 × fs for external

DA converter or clock input; output can be set to high

impedance mode.

• Audio FIFO in external SDRAM; programmable buffer

size, at least 64 kbit is available

• Synchronization modes: PTS controlled, PTS free

running, software controlled, buffer controlled

• PTS register can be set via external controller;

programmable processing delay compensation.

Background colour

• 24 bit YCbCr colour.

2000 Jan 31

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