SAA7212H 查看數據表（PDF） - Philips Electronics

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SAA7212H

Integrated MPEG AVG decoder

Philips Electronics 

Philips Semiconductors

Integrated MPEG AVG decoder

Preliminary specification

SAA7212

• Video output direct connectable to SAA718x encoder

family

• Various trick modes under control of external

microcontroller in stand-alone mode:

– Freeze field/frame on I or P pictures; restart on I

picture

– Freeze field on B pictures; restart on the next I or P

picture.

– Scanning and decoding of I or I + P pictures in a IBP

sequence

– Single step mode

– Repeat/skip field for time base correction.

MPEG2 audio features

• Decoding of 2 channels, layer I and II MPEG audio.

Support for mono, stereo, intensity stereo and dual

channel mode.

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

• Supported audio sampling frequencies: 48, 44.1, 32, 24,

22.05 and 16 kHz

• CRC error detection

• 3 decoding modes for dual channel streams: decoding

of CH1 only, decoding of CH2 only and decoding of both

CH1 and CH2

• Storage of last 54 bytes in ancillary data field

• Dynamic Range Control (DRC) at output

• Independent channel volume control and programmable

inter channel crosstalk through a baseband audio

processing unit

• Muting possibility via external controller. Automatic

muting in case of errors or data lack.

• Generation of ‘beeps’ with programmable tone height,

duration and amplitude

• Serial two 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.

• Serial SPDIF audio output. Output can be set to

high-impedance mode.

• Clock output 256 or 384 × fs for external DA converter.

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

• Software controlled stop and restart functions.

Graphics features

• Graphics are presented in boxes independent of video

format

• Screen arrangement of boxes is determined by display

list mechanism which allows for multiple boxes,

background loading, fast switching, scrolling and fading

of regions

• Support of 2, 4, 8-bit/pixel in fixed bit maps format or

coded in accordance to the DVB variable/run length

standard for region based graphics

• Display colours are obtained via colour look up tables.

CLUT output is YUVT at 8-bit for each signal component

thus enabling 16 M different colours and 6-bit for T

which gives 64 mixing levels with video,

(T = transparency).

• Bit-map table mechanism to specify a sub set of entries

if the CLUT is larger than required by the coded bit

pattern. Supported bit-map tables are 16 to 256,

4 to 256 and 4 to 16.

• Graphics boxes may not overlap vertically. If 256 entry

CLUT has to be down loaded, a vertical separation of

1 line is mandatory.

• Optimized memory utilization in MPEG video decoding

allows for a storage capacity of 1.2 Mbit for graphics bit

maps. Flexibility in memory control enables larger

capacity in a lot of applications. Moreover variable

length/run length encoding makes better use of

available memory capacity for graphics bit maps thus

making full screen graphics at 8-bit/pixel feasible.

• Fast CPU access (9 Mbytes/s) enables full 1.2 Mbit bit

map update within 20 ms

• Internal support for fast block moves in external SDRAM

• Graphics mechanism can be used for signal generation

in the vertical blanking interval. Useful for teletext, wide

screen signalling, closed caption, etc.

• Support for a single down loadable cursor of 1k pixel

with programmable shape. Supported shapes are

8 × 128 pixels, 16 × 64 pixels, 32 × 32 pixels,

64 × 16 pixels and 128 × 8 pixels.

• Cursor colours obtained via 4 entry CLUT with YUVT at

6,4,4 respectively 2 bits. Mixing of cursor with

video + graphics in 4 levels.

• Cursor can be moved freely across the screen without

overlapping restrictions.

1998 Sep 07

3

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