Motorola VL-RISC MCF5202 Manual de usuario descargar pdf (Pagina 13)

US

2006/0053436

A1

200

functions

including,

but not

limited

to,

channel

selec

tion,

recording

control,

EPG

display

and

control

and system

maintenance.

Examples

of

commercially

available

CPUs

212

include

the

STMicroelectronics

Enhanced

ST20

32-bit

VL-RISC,

Motorola

68000

or

Intel

Pentium

processors.

One

skilled

in

the

art

Will

recognize

that

the

CPU

212

may

be

integrated

With

memory

or other

discrete

electronics

com

ponents.

[0033]

Control

electronics

unit

202

may

also

contain

one

or

more

volatile

memory

components

214.

Volatile

memory

components

214

may

include,

but

are

not

limited

to,

one

or

more

SDRAM

memory

chips.

Similarly,

control

electronics

unit

202

may

contain

non-volatile

memory

components

216.

Non-volatile

memory

216

may

include

one

or

more

memory

chips,

including,

but

not

limited

to,

ROM,

SRAM,

SDRAM

and

Flash

ROM.

One

skilled

in

the

art

Will

recogniZe

that

volatile

memory

214

and

non-volatile

memory

216

may

be

integrated

Within

other

electronics

components.

One

skilled

in

the

art

Will

also

recogniZe

that

other

memory

components

may

be

included

Within

set-top-box

200

and

control

elec

tronics

unit

202.

One

skilled

in

the

art

Will

recogniZe

that

memory

214,

216

may

be used

for

many

purposes,

includ

ing,

but

not

limited

to,

storing

EPG

data

and

storing

data

for

use

by

CPU

212.

[0034]

In

a

preferred

embodiment,

signal

204

is

in

digital

form

(e.g.,

a

digital

stream)

after

demodulation and

error

correction.

For

example,

digital

stream

204

may

use,

but

is

not

limited

to

using,

the

digital

video

broadcasting

(DVB)

transport

standard.

The

digital

stream

204

may

be

multi

plexed

and

therefore

require

demultiplexing

by

XPORT

Engine

222.

Demultiplexing,

or

demuxing,

may

include

separating

the

bits

of

data

into

separate

digital

data streams.

The

digital

streams

may

be

packetiZed.

Thus,

the

multiplex

ing

of

the

separate

digital

data

streams

may

not

be

bit-by-bit

but

packet-by-packet.

The

packet

siZe

may

vary

or

may

be

constant.

After

demuxing

222

the

packets,

the

separate

digital

data

streams

may

be

reassembled

by

placing

related

packets

together

in

a

continuous

data

stream

204.

[0035]

Each

of

the

separate

digital

data

streams

may

also

be

encoded.

Encoding

is

a

method

for

representing

data.

Encoding

may

alloW

the

data

to

be

compressed.

Compres

sion

can

provide

the

system

With

increased

bandWidth.

One

skilled

in

the

art

Will

recogniZe

that

several

different

encod

ing

formats

are

possible.

In

satellite

television,

encoding

formats

may

include

the

MPEG

or

MPEG2

standards.

Beyond

the

raW

data,

the

separate

digital

data

streams

may

include

forWard

error

correction,

headers,

checksums,

or

other

information.

All of

this

different

information

may

be

included

in

the

digital

television

signal

204

processed

by

the

satellite

set-top-box

100.

Control

electronics

unit

202

may

therefore

include

one

or

more

video

processing

units

218

that,

among

other

video

processing

operations,

may

decode

encoded

signal

204.

In

a

preferred

embodiment,

video

processing

unit

218

may

include,

but

is

not

limited

to,

a

graphics

processor,

MPEG-2

decoder

and

a

display

com

positor

With

separate

on-screen

display

(OSD)

control

for

peripheral

devices.

One

skilled

in

the

art

Will

recogniZe

that

video

processing

unit

218

may

also

include

other

electron

ics,

including,

but

not

limited

to,

alpha

blending,

antialias

ing,

anti?utter

and

anti?icker

?lters,

memory

and

video

rendering

components.

[0036]

Another

discrete

electronic

component

of

control

electronics

unit

202

may

be

a

video

encoder

unit

220.

Video

Mar.

9,

2006

encoder

unit

220

may

Work

in

combination

With

or

inde

pendently

from

video

processing

unit

218.

Video

encoding

unit

220

may

encode

digital

stream

204

for

output

to

one

or

more

peripheral

devices,

including,

but

not

limited

to,

a

television.

For

example,

video

encoding

unit

220

may

encode

digital

stream

204

for

RGB,

CVBS,

Y/C

and

YUV

outputs.

Encoding

may

alloW

program

data

to

be

com

pressed.

As

a

preferred

embodiment,

video

encoder

220

may

translate

digital

stream

into a

signal

using

the

NTSC,

PAL

or

SECAM

standards.

One

skilled in

the

art

Will

recogniZe

that

video

encoder

unit

220

may

include

other

functionality,

may

be

integrated

into

other

electronic

components

of

satellite

set-top-box

200,

and

may

encode

digital

stream

204

using

other

standards, including,

but

not

limited

to,

MPEG

and

MPEG2.

[0037]

Control

electronics

unit

202

may

also

include

one

or

more

hard

drive

interfaces

226

and

hard

drives

232.

In

a

preferred

embodiment,

television

converter

device

200

con

tains

one

hard

drive

interface

226

and

hard

drive

232.

Hard

drive

232

may

be

used

for

many

purposes,

including,

but

not

limited

to,

storing

recorded

programs,

buffering

currently

playing

programs

(e.g.,

buffering

a

program

may

alloW

a

user

to

pause

or

reWind

a

program),

storing

EPG

data,

storing

commands

or

functions

for

the

control

electronics

unit

202,

storing

timers

or

record

events,

and

storing

data

for

other

devices

Within

or

connected

to

the

satellite

set-top-box

200.

As

another

example,

hard

drive

232

may

be

used

to

temporarily

store

data

for

processing

by

CPU

212.

In

this

example,

the

hard

drive

232

may

alloW

the

processor

212

to

separate

EPG

data

arriving

as part

of

digital

stream

208.

One

skilled

in

the

art

Will

recogniZe

that

other storage

devices

and

interfaces

may

be

substituted

for

hard

drive

interface

226

and

hard

drive

232

and

are

Within

the

scope

of

this

invention.

One

skilled in

the

art

Will

also

recogniZe

that

hard

drive

interface

226

and

hard

drive

232

may

separately or

together

include

an

integrated

memory

(e.g.,

a

memory

buffer,

commonly

knoWn

referred

to

as

cache)

and

addi

tional

processing

components

or

logic.

One

skilled

in

the

art

Will

also

recogniZe

that

hard

drive

interface

226

may

be

integrated

into

peripheral

interface

224

(described

beloW).

Finally,

one

skilled

in

the

art

Will

recogniZe

that

hard

drive

232

may

be

external

and

connected

to

satellite

set-top-box

200.

For

example,

an

external

hard

drive

232

may

be

connected

to

satellite

set-top-box

200

using

USB

2.0 or

IEEE

1394

(FireWire)

connections.

Such

an

external

hard

drive

may

include

a

screen

for

portable

vieWing

of

program

ming

stored

on

it.

[0038]

An

audio

processing

unit

228

may

also

be

part

of

the

control

electronics

unit

202.

Audio

processing

unit

228

may

decode

the

digital

stream

204

for

output

to

peripheral

devices,

including,

but

not

limited

to,

a

stereo,

television

speakers

or

portable

audio

or

video

players.

For

example,

audio

processing

unit

228

may

decode

MPEG-1

layers

MI

and

layer

III,

Dolby

Digital,

Dolby

ProLogic,

SRS/TruSur

round

encoded

audio

in

digital

stream

204.

Audio

processing

unit

228

may

include

one

or

more

processors,

memory

components

or

digital

to

audio

converter

(DAC)

systems.

One

skilled

in

the

art

Will

recogniZe

that

other

audio

pro

cessing

components

and

functionality

may

be

accomplished

using audio

processing

unit

228.

[0039]

A

satellite

set-top-box

200

may

be

connected

to

one

or

more

peripheral

electronic

devices

through

peripheral

interface

224.

These

peripheral

devices

may

include

a

stereo

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