BOARDCOM BCM1112

BCM1112
®
VOICE OVER IP CPE ENGINE
FEATURES
• The BCM1112 is the most highly integrated silicon solution for
Ethernet Residential Gateway and Stand-Alone Media
Terminal Adapter applications.
• The BCM1112 Integrates:
• 150-MHz MIPS32 CPU (165 DMIPS) with 8K I-cache and 4K
D-cache
• Superscalar 108-MHz ZSP DSP with dual-MAC (216 MIPS),
48K instruction and 32K data RAM
• Three-port 10/100BASE-T Ethernet switch with 64K buffer
memory
• Two 10/100BASE-T Ethernet PHYs with in-line power over
Ethernet support
• Three wideband audio ADCs and DACs
• Ethernet status LED driver
• TDM IOM-2® port
• Two UARTs
• Two high-speed serial ports
• General purpose I/O
• Interrupt control unit
• DMA support unit
• SDRAM interface
• External Bus Interface
• IEEE 1149.1 (JTAG)
• 0.18u process technology, 1.8/3.3V
• 1.1W peak, 0.3-0.8W standby modes
• 256-PBGA package enables 4-layer PCB designs
• Pin Compatible with BCM1101
HARDWARE PLATFORMS
• BCM91112SMTA Reference Platform
• Ethernet Residential Gateway reference design
• PacketCable SMTA reference design
SUMMARY OF BENEFITS
• 10/100BASE-T Ethernet Switch with 802.1p/Q Support
• 802.1p Ensures QoS for voice packets and minimizes latency
• 802.1Q VLAN support allows for segmenting physical
networks into multiple logical networks
• MIPS32 CPU not burdened by data packet processing, leaving
more cycles for application program
• Enables wire-speed non-blocking operation
• Blocks unnecessary traffic by learning local MAC addresses
• Segments network, preventing any restriction on number of
hops
150-MHz
MIPS32 CPU and 108 MHz DSP Support
•
• In VoIP Gateway applications:
- Full SIP client implementation
- G.711, G.726, G.729A/AB and G.723.1/A
- Fax relay (T.38, V.17, V.29, V27ter)
- Two voice channels, or one voice channel and one fax
channel, and a third channel limited to G.711 voice
• 10/100BASE-T Ethernet MACs and PHYs
• Integrates support for Modified Link Pulse in-line power
specification
• Compliant with 802.3af power over Ethernet standard
• Provides Auto MDI/MDIX enabling the use of straight or
crossover cables in either port
• Wideband Audio CODECs
• Enables support of emerging wideband vocoding standards
OVERVIEW
Uart 0
Uart 1
18 GPIOs
External
Interrupt
Controller
18 GPIOs
IPB
Bridge
Peripheral Bus
Watchdog
Timer
MIPS32 CPU
+ 8K I-Cache
+ 4K D-Cache
Timers
Analog Processor Module
CODEC Channel 3
CODEC Channel 2
CODEC Channel 1
16-bit D/A
48 KB
Program
Memory
ZSP JTAG
32 KB
Data
Memory
ZSP DSP
16-bit D/A
10BT/100BT
Auto-MDIX Phy
port 0
10BT/100BT
Auto-MDIX Phy
port 1
3 Port
Ethernet
Switch
Ethernet LED
Driver
port 2
64KB Buffer
Memory
The Broadcom BCM1112 represents a new level of integration for
Ethernet Residential Gateway and Stand-Alone Media Terminal Adapter
applications.
Key modules integrated in the BCM1112 include:
• MIPS32 150 MHz processor with 8K 2-way set associative I-cache
and a 4K 2-way associative D-cache. This MCU supports the VoIP
protocol stacks, jitter buffer management, and application program.
Programming is done in C, on top of Broadcom's object-oriented
signal processing API.
• ZSP 108 MHz DSP with 48K instruction and 32K data RAM. The
DSP supports a wide range of vocoders, fax modems, and a variety
of telephony algorithms (e.g., DTMF and Call Progress Tones).
• Analog Codecs. Three ADCs and DACs are integrated, eliminating
the need for an analog switch to allow the sharing of a codec between
multiple interfaces.
100 MHz CPU System Bus
MIPS JTAG
High
Speed
Serial
Port 2
High
Speed
Serial
Port 1
TDM
IOM-2
Port
50 MHz
External Bus
Interface
Flash/
EPROM
SDRAM
Interface
SDRAM
DMA
Arbiter
• 10/100BASE-T Ethernet Switch, Media Access Controllers, and
Transceivers. The three-port Ethernet switch integrates three fullduplex capable Media Access Controllers (MACs), a Serial
Management Port, an address resolution engine, a non-blocking
switch controller, 64K of internal switch memory, 802.1p
prioritization for voice packets, 802.1Q VLAN tagging support for
segmenting physical networks into multiple logical networks, and a
set of Management Information Base (MIB) statistics registers. The
two transceivers perform all of the functions for 100BASE-T
Ethernet in full- or half-duplex mode over Category (CAT) 5 twisted
pair cable and 10BASE-T Ethernet in full- or half-duplex mode over
CAT 3, 4, or 5 twisted pair cable. They support Auto MDI/MDIX
detection to allow the use of any cable type in either port. The
transceivers also integrate support for in-line powering over Ethernet.
The BCM1112 integrates all the key silicon components of an Ethernet
IP Gateway into a single device, thereby reducing the overall system cost
and complexity of Terminal Adapter products, while at the same time
increasing their voice quality and the reliability of the network to which
they are attached.
Broadcom®, the pulse logo, Connecting everything®, and the Connecting everything logo are among 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
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2004 by BROADCOM CORPORATION. All rights reserved.
1112-PB02-R
02/23/05
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com