bcm3252 Broadcom Corp., bcm3252 Datasheet - Page 2

• Manufacturer Part Number: bcm3252
• Description: Bcm3252 - Dual-channel Front-end Docsis 2.0 Stb Ic With Channel Bonding
• Manufacturer: Broadcom Corp.

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
BCM3252 can be configured to output CableCARD
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
Broadcom
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.
BROADCOM CORPORATION
5300 California Avenue
Irvine, California 92617
© 2007 by BROADCOM CORPORATION. All rights reserved.
3252-PB02-R
®
DOCSIS
QAM In
QAM In
US Out
, the pulse logo, Connecting everything
Video
IF In
12/05/07
DAC Array
2G Power
PNP
Vreg
1.2V
®
16–1024 QAM
Demodulator
16–1024QAM
Demodulator
Demodulator
®
Out-of-Band
, and the Connecting everything logo are among
Modulator
256 QAM
PNP
QPSK-
Vreg
2.5V
™
MPEG out
signals, which
Generation
BCM3252 Block Diagram
27-MHz
Clock
Xtal
500-MHz RBUS
2.0+ MAC
TX Conv
Bonding
O V E R V I E W
DOCSIS
Channel
Module
with
Test Mux
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
graphics subsystem. It contains a MIPS32
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.
SPI
Periph
Starvue
Serial
Flash
Logic
DAVIC
MAC
Ethernet
Ethernet
FPM with
802.3u
IEEE
MAC
32-KB
SRAM
PHY
133-MHz UBUs
Isolation
USB 2.0
USB 2.0
16-KB TO
32-KB TI
DCache
ICache
UBUS Arbiter
16 KB
MPI PCI/EBI
PCI/EBI
Dual-Threaded
MMU + Dual
MIPS Core
4350-CMT
300-MHz
MAC
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.broadcom.com
16-bit DDR
16-bit DDR
®
UBUS BIU
Controller
(DDR266)
133-MHz
133-MHz
Boot ROM
16-KB
processor dedicated to