OM5721 datasheet(4/20 Pages) PHILIPS

4 / 20 page

1999 May 05

Philips Semiconductors

Product speciﬁcation

STB5660 (Set-Top Box) STB concept

OM5721

• Support of fast DMA transfer

• High speed/low latency interface with second graphics

SDRAM

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

address range

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

interface with external controller at up to 40.5 MHz

• Support of Motorola ColdFire and 68xxx interfaces as

well as LSI L64108 interface.

1.2.3

MPEG2 SYSTEM FEATURES

• Support for seamless time base change (edition)

• Processing of errors flagged by channel decoding

section.

1.2.4

MPEG2 VIDEO FEATURES

• Decoding of MPEG2 video up to main level, main profile

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

pictures. Picture format 720 to 576 at 50 Hz or

720 to 480 at 60 Hz.

• Support of constant and variable bit rates up to

15 Mbits/s for the elementary stream

• Digital video input/output interface on 8-bit,

27 MHz (CbYCrY multiplexed bus), at a CCIR-656

format

• Analog video output interface on both the RGB and

Y/C/CVBS formats (internal digital encoder)

• 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.

• Vertical scaling with fixed factors 0.5, 0.75 factor 0.75 is

used for letter-box presentation, 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

• Horizontal and vertical scaling can be combined to scale

pictures to 1

⁄4 their original size, thus freeing up screen

space for graphic applications like Electronic Program

Guides (EPGs)

• 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 27-Mbit

• 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.

1.2.5

MPEG2 AUDIO FEATURES

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

Support for mono, stereo, intensity stereo and dual

channel mode.

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

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

22.05 and 16 kHz

• Selectable output channel in dual channel mode

• Dynamic range control 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.

• Generation of ‘beeps’ with programmable tone height,

duration and amplitude

• Support for up to 8 channels linear Pulse Code

Modulation (PCM) elementary audio streams with 8, 16,

20 and 24 bits/sample and bit rates up to 6.144 Mbits/s

• 96 kHz Linear Pulse Code Modulated (LPCM) samples

will be mapped to a 48 kHz multi-channel format

• Volume control for linear PCM samples in three steps:

−6 dB, −12 dB and −18 dB

• Burst-formatting of AC-3 elementary streams and

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

interconnection with an external multi-channel decoder

via the digital audio output or the IEC 958 output

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