SAA7215HSSLASHC2 datasheet(4/20 Pages) PHILIPS

4 / 20 page

1999 Aug 25

Philips Semiconductors

Preliminary speciﬁcation

STB5860 (Set-Top Box) STB concept

OM5730

1.2.2

CPU RELATED FEATURES

• External SDRAM self test

• Asynchronous interface possible with external

microcontroller

• 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 and 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 and 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

Modulated (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

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