BCM1112
VOICE OVER IP CPE ENGINE
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
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
F E A T U R E S
S U M M A R Y O F B E N E F I T S
H A R D W A R E P L A T F O R M S
BCM91112SMTA Reference Platform
Ethernet Residential Gateway reference design
PacketCable SMTA reference design
O V E R V I E W
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
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
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.
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.
10/100BASE-T Ethernet Switch, Media Access Controllers, and
Transceivers. The three-port Ethernet switch integrates three full-
duplex 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.
Analog Processor Module
MIPS32 CPU
+ 8K I-Cache
+ 4K D-Cache
ZSP DSP
3 Port
Ethernet
Switch
CODEC Channel 3
Uart 0
Timers
IPB
Bridge
Peripheral Bus
DMA
Arbiter
1
00 M
H
z
CP
U S
y
stem
Bus
32 KB
Data
Memory
SDRAM
External
Interrupt
Controller
18 GPIOs
10BT/100BT
Auto-MDIX Phy
64KB Buffer
Memory
48 KB
Program
Memory
Watchdog
Timer
Ethernet LED
Driver
CODEC Channel 2
Flash/
EPROM
TDM
IOM-2
Port
High
Speed
Serial
Port 1
SDRAM
Interface
50 MHz
External Bus
Interface
10BT/100BT
Auto-MDIX Phy
port 0
port 1
port 2
ZSP JTAG
MIPS JTAG
Uart 1
CODEC Channel 1
16-bit D/A
16-bit D/A
High
Speed
Serial
Port 2
18 GPIOs
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