SAA7215HSSLASHC2 datasheet(12/20 Pages) PHILIPS

12 / 20 page

1999 Aug 25

Philips Semiconductors

Preliminary speciﬁcation

STB5860 (Set-Top Box) STB concept

OM5730

SOFTWARE DESCRIPTION

5.1

Software overview

5.1.1

GENERAL SOFTWARE RESOURCES

• Real-time kernel

• Board support package

• Operating system abstraction package.

5.1.2

APPLICATION LAYER

• Feature demonstration application.

5.1.3

SYSTEM CONTROL LAYER

• Graphics library

• PSI processing

• Front panel communications

• IEEE 1394

• Satellite front-end component

• Teletext processing component.

5.1.4

PLATFORM LAYER

• MPEG System Processor (MSP)

• Audio/video/graphics device driver

• Front panel device driver

• Flash memory device driver

• Non-Volatile Memory device driver

• Debug UART device driver

• IEEE 1394 device driver

• Smart card device driver

• IEEE 1284 device driver

• LNB device driver

• Satellite tuner device driver

• TDA8044A device driver.

5.1.5

I/O DEVICE DRIVERS

• Parallel I/O device driver

• I2C-bus device driver

• UART device driver.

5.2

General software resources

This layer is used by all the layers. Typical parts are

real-time operating system functionality, C-library and

debug components.

5.3

System control layer

Part of the system control layer provides functionalities

which are a compound of device driver functionality.

Examples of the system control layer components are

teletext, which uses the TS/PES package an part of MSP

device driver and the AVG device driver. Also the front-end

satellite component is a functional layer component, it

uses the LNB device driver, the satellite tuner device driver

and the TDA8044A device driver.

5.4

Platform layer

The platform layers consists of set of platform drivers each

controlling a set-top box functionality that is implemented

in hardware. Examples of a set-top box functionality are

video decoding, audio decoding and section filtering. It is

possible that more than one platform driver can control a

physical hardware component (IC) if this component

provides a set of set-top box functions.

The interface of a platform driver consists of generic set of

functions. It is the intention not to directly specify hardware

interface functions but MPEG/DVB related functions.

In this way future generations of controlled hardware use

the same subset of interface functions. Some platform

drivers do not directly interface with the hardware but use

an I/O platform driver. Platform drivers are not allowed to

communicate with each other. If communicating is

required between platform drivers it is under control of a

component located in the functional layer.

The I/O platform drivers provide the functions when a

device driver does not directly have access to the

hardware. Examples of I/O device drivers are an I2C-bus

device driver and an UART device driver.

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