Product Brief
April 2003
T8303
Phone-On-A-ChipTM IP Solution
Application
■Voice over internet protocol (VoIP) telephone.
Solution Features
■Complete VoIP telephone solution:
— No dependency on external processor.
— All of the required software components pro-
vided in the form of binary and/or source code.
— Development board with integrated demo voice
application using H.323 and session initiation
protocol (S IP) protocols.
— Complete system solution includes Wind River
Systems VxWorks® real-time operating sys-
tem (RTOS), Trillium Digital Systems® H.323
and SIP, Agere's G.7XX voice codecs.
■High integration requires fewer exte rnal compo-
nents:
— Single Ethernet port with embedded PHY and
MAC.
— Integrated differential inputs provide high noise
immunity for analog signals.
— Integrated reset control circuit reduces design
complexity and board space.
T8303 Feature Summary
■T8303 features include:
— 3.3 V device in 272-pin PBGA package.
— ARM ® 940T and DSP1600 cores running at
100 MHz clock speed.
— Integrated 10/100 Base-T Ethernet MAC and
PHY.
— IrDA, UART, external memory interface (EMI),
SSI, and 16-bit parallel I/O.
— Two 16-bit DACs; one 16-bit ADC.
— GCI+ interface, bit I/O, and serial I/O.
— Three-way hy br id con fer en ci ng.
— G.711 appendices I & II, G.723.1, G.726,
G.729A, G.729B, and wideband G.722.
— Voice activity detection and comfort noise gen-
eration.
— DTMF generation.
— Acoustic echo ca nc ell ation for full-duplex
speakerphone.
— Open listening support.
— Two differential analog inputs and one single-
ended analog input.
— Two differential analog outputs and one single-
ended analog output.
Figure 1. Phone-On-A-Chip Development Board Blo ck Diagra m
22 Agere Systems Inc.
Product Brief
April 2003
Phone-On-A-Chip IP Solution
T8303
Description
The Phone-On-A-Chip is a complete VoIP single-chip
solution. The T8303, along with minimal additional
components, provides all the active func ti ons requir ed
to implement a complete VoIP based telephone. As
shown in Figure 1, chip interfaces have been provided
to allow direct integration into a system design; reduc-
ing time to market, implementation risk, and compo-
nent cost. The network interface is implemented as an
autonegotiating 10/100 Mbits/s Ethernet based LAN.
The chip includes an Ethernet port with priority queuing
running at 10/100 Mbits/s. A fully functional MII inter-
face facilitates other external PHYs compatible with the
802.3 MAC.
T8303 Detailed Features
Microp roc essor Feat ures
■Core:
— ARM 940T core with 4 Kbyte instruction cache
and 4 Kbyte data cache.
— Clock speed of 100 MHz (110 MIPS).
— System memory inte rf ace to ARM with support
for SDRAM, Flash, and SRAM.
— 1 K x 32 on-chip SRAM.
■Peripherals:
— Ethernet:
❏Integrated 802.3 MAC controller.
❏Integrated 10/100 Mbits/s PHY.
❏Two Ethernet port hardware queues for han-
dling priority processing of voice traffic per
IEEE® 802.1p and 802.1q.
❏VLAN support with tag insertion, tag deletion,
tag modificatio n.
❏Hardware support for network management
(SNMP/RMON).
— IrDA infrared communication interface.
— UART interface.
— Synchronous serial communications controller
and interface.
— 16-bit parallel I/O.
— LED control interface for 72 LEDs.
— Keyboard scan circuitry with support for 72 keys.
— Four general-purpose timers.
— Real-time clock.
— JTAG support fo r ARM development tools.
■Software:
— Objects:
❏ITU-T H.323 and IETF SIP protocol stacks.
❏RTP/RTCP.
— Sample source code:
❏H.323 and SIP phone sample application
❏API wrapper to interface with the Trillium H.323
and SIP protocol stacks.
❏Board support package (BSP) for Phone-On-
A-Chip dev elopm ent boar d .
❏Comp lete set of device drivers.
❏Source code for DSP API and sample jitter
buffer management.
Digital Signal Processor Features
■Core:
— DSP1600 core with 48 K x 16 ROM and 16 K x 16
RAM (zero wait-state, DPRAM); 12 K SRAM (sin-
gle wait state) data.
— DSP clock speed of 100 MHz.
— GCI interface.
— Two timed DMA outputs for simultaneous hand-
set and speaker audio output.
— Two serial I/O interfaces.
— Bit I/O interface.
— General-purpose timer counter.
■Peripherals:
— Low-pass filtering on audio inputs and outputs.
— 16-bit analog-to-digital converter.
— Two 16-bit digital-to-analog converters.
— Programmable gain amplifier on audio input.
— T wo differential and one single-ended audio input
for use with speakerphone, handset, and/or
headphone.
— Fixed gain amplifier for differential inputs.
— One single-ended audio output to drive a stan-
dard 150 Ω handset speaker.
— Two sets of differential audio outputs to drive
125 mW into 16 Ω speakers.
■Software:
— G.711 Appendices I & II, G.723.1, G.726, and
G.729A, G.729B, wideband G.722.
— Voice activity detection.
— Local loop support, dial tone, busy tone, call wait-
ing tone, ring-back tone, and network busy tone.
— Comfort noise generation.
— Acoustic echo cancellation for full-duplex speak-
erphone.
General F eatures
■Addit ional features include :
— 3.3 V device in 272-pin PBGA package.
— JTAG boundary-scan capability.
— JTAG tools (debug) capability.
— Only two external crystals required.
Product Brief
April 2003
Agere Systems Inc. 3
Phone-On-A-Chip IP Solution
T8303
The Chip Set Functions
Figure 2. T8303 Block Diagram
The chip functions are depicted in the Phone-On-A-
Chip block diagram above. Some of the key functions
included in this chip are described in the following two
sections.
Integrated Amplifiers
All the gain amplifiers are integrated on the T8303,
eliminating the need for external amplification.
Adaptable Acousti c Echo Cancellation
The adaptable acoustic echo cancellation algorithm
automatically adjusts the AEC for the environment
(room size, telephone housing, etc.).
Tone Generation
DTMF, ringing, and call progress tones are generated
by the T8303. The particular tone is selected via an API
command.
Integrated PHY
The Ethernet port is integrated with an 802.3 MAC and
PHY that is configurable for 10/100 Mbits/s, full-/half-
duplex. This eliminates the need for an external PHY
and allows the board to have a smaller footprint.
Prio r iti zati o n of R e a l-Time Data
QoS support is provided in accordance with IEEE
802.1p and 802.1q.
Data and Instruction Cache
The ARM940T processor core offers the benefit of
4 Kbytes instruction cache and 4 Kbytes data cache.
Advantages of Phone-On-A-Chip
Lower Total System Cost
Phone-On-A-Chip eliminates the need for expensive
glue logic. All the required interfaces such as keypad,
LED, amplifiers, and PHY are integrated within the
device.
Product Brief
April 2003
Phone-On-A-Chip IP Solution
T8303
Agere Systems Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. Agere,
Agere Systems, the Agere logo, and Phone-On-A-Chip are trademarks of Agere Systems Inc.
Copyright © 2003 Agere Systems Inc.
All Rights Reserved
April 2003
PB03-114IPT
For additional information, contact your Agere Systems Account Manager or the following:
INTERNET: http://www.agere.com
E-MAIL: docmaster@agere.com
N. AMERICA: Agere Systems Inc., Lehigh Valley Central Campus, Room 10A-301C, 1110 American Parkway NE, Allentown, PA 18109-9138
1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610 -712-4106)
ASIA: Agere Systems Hong Kong Ltd., Suites 3201 & 3210-12, 32/F, Tower 2, The Gateway, Harbour City, Kowloon
Tel. (852) 3129-2000, FAX (852) 3129-2020
CHINA: (86) 21-5047-12 12 (Shanghai), (86) 755-25881122 (Shenzhen)
JAPAN: (81) 3-5421-1600 (Tokyo), KOREA: (82) 2-767-1850 (Seoul), SINGAPORE: (65) 6778-883 3, TAIWA N: (886) 2-2725-5858 (Taipei)
EUROPE: Tel. (44) 1344 296 400
Advantages of Phone-On-A-Chip
(continued)
High Sound Quality
The differential amplifiers for the speaker and the
microphone are integrated into the chip, providing very
high sound quality at low cost.
Reduced Development Time
A development kit bundled with the required sample
source code and binaries gives a jump start for the
development of application code that can easily be
migrated to target products. This developm ent boar d
can be easily shrunken into a cost-effective solution.
High Performance and QoS
QoS support is provided in accordance with IEEE
802.1p and 802.1q. A four-channel DMA ensures fast
data transfers between user interfaces and memories
to supplement the performance.
Extended Alliance Programs
Agere has formed alliances with industry leaders to
ease product development enabling fast time to mar-
ket. Relationships with Wind River Systems and Tril-
lium Digital Syst em s provide value pricing for
integration of hardware and software. Agere has quali-
fied RealTime Digital Inc. as a third-party vendor to
customize the DSP code parameters.
Industry Proven Funct ionality
The T8303 mitigates development risk by integrating
the proven functionality of Agere's T8301/T8302 VoIP
phone chip set into a single chip solution. The T8301/
T8302 has been successfully deployed by VoIP phone
manufacturers. Therefore, the T8303 incorporates a
proven design with field tested software, and comple-
ments the T8300, which has two Ethernet ports.
Building a System with Phone-On-A-
Chip
A development kit has been designed to help custom-
ers expedite their IP telephone product launch by
reduci ng the dev elopment cycl e signi fic an tly. The
development kit provides a turnkey demo solution to
plug and play with the H.323 and SIP protocol stack
based applications. The development design kit
includes the following:
■Welcome letter and a getting started guide.
■Two complete IP telephone development boards.
■Integrated solution including H.323 and SIP based
sample application to allow quick evaluation.
■CD including all the binaries, sample source code, all
necessary documentation, and tools.
■Schematic diagrams, PCB layout source files, and
bill of materials.
■Development board layout files.
■Phone-On-A-Chip device datasheets.
■Application notes.
■FAE regional customer support for one year.
This integrated solution approach provides a self-con-
tained V oIP telephone solution, allowing our customers
to concentrate on system-related issues. The develop-
ment kit reference design can easily be adapted to pro-
vide a commercial product.
Wind River Systems and VxWorks are registered trademarks of Wind River-
Systems Inc.
Trillium and T rillium Digital Systems are registered trademarks of Trillium Digital
Systems, Inc.
ARM is a registered trademark of ARM Ltd.
IEEE is a registered trademark of The Institute of Electrical and Electronics
Enginee rs, Inc.
