OV E R V I E W

®

Phone: 949-926-5000

Fax: 949-926-5203

E-mail: info@broadcom.com

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BROADCOM CORPORATION

5300 California Avenue

Irvine, California 92617

© 2007 by BROADCOM CORPORATION. All rights reserved.

3252-PB02-R

12/05/07

the trademarks of Broadcom Corporation and/or its affiliates in the United States, certain other countries

and/or the EU. Any other trademarks or trade names mentioned are the property of their respective

owners.

BCM3252 Block Diagram

Broadcom’s ICs provide the solution for the next-generation interactive

DOCSIS 2.0+, DSG HD AVC set-top box. The main sections include a

front end (tuners, QAM, and DOCSIS), addressed by the BCM3420 and

BCM3252, and a back end (HD AVC/VC-1/MPEG2 decoding, audio

decode, HDMI, and peripherals, etc.), addressed by the BCM7402.

The BCM3252 IP Video Pipeline IC provides the integrated front-end

solution for high-end set-top boxes. It has a high-performance processor

that can address the tasks of DOCSIS 2.0+, channel-bonding

resequencing, and network protocols such as TCPIP, UPnP, and IPv6.

The BCM3252 is both DOCSIS- and EuroDOCSIS-certified.

The OOB and upstream modulator of the BCM3252 conforms to the

DVS-167, DVS-178, and DOCSIS standards. The GPIO on the

connect directly to the CableCARD socket.

The BCM3252 supports both the individual program channel mode (up

to two video channels) and the channel-bonded mode (up to two

DOCSIS channels). These modes can be switched from one to the other

via software, making the BCM3252 ideal for networks that will move to

channel bonding in the future.

Broadcom’s latest CMOS tuner, the BCM3420, addresses the low power

needs of set-top boxes and extends the range of tuning up to 930 MHz.

The BCM7402 is a single HD AVC/VC-1/MPEG2 decoder with

applications and OS. Included in the BCM7402 are integrated video

amps, MAC and PHYs for USB 2.0, USB 1.1, 10/100 Ethernet, flexible

audio core supporting today's major audio codecs, and other next-

generation set-top box features. The BCM3252/BCM7402 systems also

support a single unified Flash for reduced component BOM and systems

cost savings. A full 80-Mbps IP video stream is supported in channel

bonding mode in the BCM3252/BCM7402 set-top.

The BCM3252 and BCM3420, along with the BCM7402, provide the

solution for the next-generation basic interactive DOCSIS 2.0+/DSG HD

AVC set-top box products, meeting the requirements for US cable

operators and international operators alike.

The BCM3252 is in volume production today.

1.2V

Vreg

2G Power

DAC Array

US Out

Video

QAM In

IF In

2.5V

Vreg

Modulator

QPSK-

256 QAM

MPEG out

Clock

Generation

TX Conv

Module

Starvue

DAVIC

MAC

FPM with

32-KB

SRAM

16-KB TO

32-KB TI

ICache

300-MHz

4350-CMT

MIPS Core

Dual-Threaded

MMU + Dual

MAC

UBUS BIU

UBUS Arbiter

133-MHz

16-bit DDR

Controller

133-MHz

16-bit DDR

(DDR266)

16 KB

DCache

Test Mux

Periph

Logic

Ethernet

MAC

Ethernet

PHY

IEEE

802.3u

SPI

USB 2.0

MPI PCI/EBI

PCI/EBI

USB 2.0

DOCSIS

QAM In

Demodulator

16–1024QAM

16-KB

Boot ROM

DOCSIS

2.0+ MAC

with

Channel

Bonding

Out-of-Band

Demodulator

Demodulator

16–1024 QAM

500-MHz RBUS

133-MHz UBUs

Serial

Flash

Isolation

27-MHz

Xtal

PNP

PNP