BCM7020 ETC, BCM7020 Datasheet - Page 2

• Manufacturer Part Number: BCM7020
• Description: HIGH DEFINITION VIDEO UMA SUBSYSTEM WITH 2D GRAPHICS
• Manufacturer: ETC

The BCM7020 Advanced High Definition, Video/Graphics Subsystem
supports the requirements of television and set-top box systems that
require high definition or standard definition decoding of MPEG-2
streams with simultaneous high-definition and standard definition
outputs. For systems that require only standard-definition output, a
reduced-memory mode substantially reduces the amount of memory
needed for the video decompressions process. The video decoder also
supports multiple-stream, standard definition decoding, providing both
tiled video and PIP capability.
The BCM7020 graphics are based on Broadcom’s advanced
video/graphics technology that allows studio-quality text and graphics
to be displayed on television-based systems. The graphics compositing
engine allows for many windows of graphics and video to be layered
with blending and anti-aliasing, creating rich, high-quality, display
capability.
An onboard vector RISC processor provides 2D graphics, anti-aliased
text, and 3D effects.
A MPEG-2 DVB/DC2-compliant transport demux with 3 transport
stream inputs has advanced section filtering capability, DVB
descrambler, DES descrambler with ECB/CCB capability, and 2
ISO7816 smart card interfaces. The DES descrambler complies with
the DVS 213 requirements for the transport stream POD interface.
The transport engine is designed to support personal video recorder
(PVR) functions, allowing the set-top box to support VCR-like
functions, such as fast forward/reverse, pause, and record.
Broadcom
Broadcom Corporation and/or its subsidiaries in the United States and certain other countries.
All other trademarks are the property of their respective owners.
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2002 by BROADCOM CORPORATION. All rights reserved.
7020-PB08-403-R 11.19.02
®
, the pulse logo, and Connecting everything
Transport 1
Transport 2
Transport 3
Analog
Video
In
Processor with DVB and DES
®
Decoder and TBC
Composite Video
MPEG-2 Transport
Dual ISO7816 I/F
MPEG-2 Video
Video Scaler
HD/Dual SD
Descramblers
Decoder
A/D
B C M 7 0 2 0
®
are trademarks of
PCI
Engine
Dual
PVR
Bridge
Bus
ROM and
I/O
(2-KB instruction/
Interface and
data cache)
CPU Bus
Access
Caches
DMA Engine
CPU
Controller
SDRAM
SDRAM
O V E R V I E W
The BCM7020 simultaneously supports up to 2 record and 2
playback streams , with optional 3DES encryption/decryption.
The BCM7020 decodes both Dolby Digital (AC-3) and MPEG
multichannel compressed streams. Audio output is provided over stereo
DACs or SPDIF.
A PCM audio engine mixes separate audio streams generated from the
MPEG2/Dolby audio decompression circuitry, PCM audio generated
from the CPU, or PCM audio input via a baseband audio input. These
streams can be resampled and mixed together with volume control.
A bus bridge is incorporated to provide a complete solution bridging the
processor to memory, local I/O, and PCI. Main memory is shared among
video, graphics, and the CPUs, which increases system performance and
reduces cost. A flexible and powerful DMA controller offloads the CPU by
transfering data between the different busses and memory, facilitating the
needs of systems incorporating a cable modem.
DVD playback is realizable. The on-chip MPEG video decoder has the
ability to parse the PES streams extracted from the program streams found
on DVDs. AC-3 audio can be decoded to either stereo or Dolby ProLogic
and output to either the on-chip DAC and/or as PCM to the SPDIF interface.
The audio engine can also output native AC-3 or DTS bit streams directly
to the SPDIF. Sub-picture decoding and rendering are handled by the host
CPU and the on-chip graphics processor. With the assistance of software
running on an external CPU, a complete DVD playback system can be
realized.
Processor
Graphics
Format Conversion
Video/
Paxel
Display Engine
Graphics and
HD Display and
Video
Dolby and
Decoder
MPEG
Audio
Composite
HD DACs
Encoder
Video
Dual
and
Stereo
Audio
Audio
DACs
PCM
Email: [e-mail]
HD/SD Analog
Video
SD Analog
Video
PCM
Audio In
Dual I
L
R
SPDIF
Web: www.broadcom.com
Phone: [phone]
2
S
FAX: [phone]