exciting new upgrade to Agere Systems Inc. line of
host-based controller modems. The DSP1648C
upgrades the technologies found in the DSP1648
V.90 modem solution to the new ITU-T
recommendations V.92 and V.44 communication
industry standards. V.92 and V.44 have four innova-
tive features, designed to improve modem perfor-
mance in the internet environment. The new features
are as follows:
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Two chip 3.3 V PCI modem solution with
5 V tolerant buffers
Data mode capabilities:
— ITU-T V.92
*
: 56000 bits/s—28000 bits/s
— ITU-T V.90
*
: 56000 bits/s—28000 bits/s
— ITU-T V.34: 33600 bits/s—2400 bits/s
— V.32bis, and fallbacks
— V.42 and
MNP
™
error correction (LAPM)
— V.44, V.42bis and
MNP
Class 5 data
compression
FAX mode capabilities:
— ITU-T V.17, V.29, V.27ter, and V.21 Ch 2
— ITU-T T.31 Class 1 FAX
Compatible with transformer-based and silicon
DAA circuits:
— High-precision sigma-delta codec (CSP1034C)
— Line-powered silicon DAA (CSP1035A)
Enhanced voice features:
— Full-duplex speakerphone (requires CSP1027
audio codec)
— Telephone answering machine (TAM)
— Caller identification (caller-ID)
V.80 video-ready interface
Bit I/Os to support domestic and international
DAAs
Low power consumption
Flexible power management modes
Operating system support:
—
Windows
®
95, 98, 2000,
Windows NT
®
4.0,
Windows
ME, and
Windows
XP
— Linux
®
— PC 2001 compliant
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Modem fast connect: faster start-up times.
Modem on hold
†
: switch between modem and an
incoming phone call without losing the data
connection.
PCM upstream: send data to central site at rates
approaching 48 kbits/s.
Data compression enhancement focused on
todays internet traffic.
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The DSP1648C has an integrated PCI interface,
which eliminates the 16550 UART bottleneck found
in traditional hardware modems. The PCI interface
supports both slave and master operations while pro-
viding greater access to host PC system resources.
Host-based controller modems have the benefit of
using powerful CPUs and accessing their plentiful
RAM and disk space. Modem firmware can therefore
be updated in the field since the code simply resides
on the disk.
With this feature set, designers can create full-fea-
tured modem solutions which are characterized by
low-cost, low power consumption, and high-perfor-
mance.
* Due to FCC limitations, speeds of 53 kbits/s are the maximum
permissible transmit power levels during download transmis-
sion. Actual data speeds will vary depending on the line
conditions.
† Modem on hold functionality requires call waiting services.
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Agere Systems DSP1648C
Host-Based Controller V.92 Modem Chip Set
Product Brief
September 2001
Video-Ready Interface
The video-ready interface supplied by the DSP1648C
chip set provides video conferencing capability using
traditional POTS lines. The implementation of the
ITU-T V.80 standard provides a seamless interface for
either software or hardware-accelerated ITU-T H.324
implementation. The host-based architecture of this
chip set facilitates future upgrades.
Telephone Answering Machine
The TAM mode uses a modified version of the com-
mand set defined by ITU-T recommendation V.253. All
AT commands are sent through the COM port. The
actual voice samples are sent by a WAVE driver
directly to the data pump hardware.
In order to be backward compatible to some voice
applications, the DSP1648C also supports a standard
V.253 command set. In V.253 voice commands, voice
samples are sent to the COM port along with <DLE>
shielded commands.
Concurrent data, FAX, voice discrimination, and DTMF
tone detection are supported during TAM mode. Dis-
tinctive ring and synthesized rings are available in TAM
mode.
Functional Description
DSP1648C
The Agere Systems DSP1648C chip set is a two-chip
solution consisting of Agere Systems DSP1648C
digital signal processor, a CSP1035A silicon data
access arrangement (DAA) or a CSP1034 line codec.
An optional CSP1027 audio codec is required to sup-
port full-duplex speakerphone. It supports V.92, V.90,
V.34 data, and FAX rates up to 14.4 kbits/s. The host-
based controller solution is compatible with
Windows
95 and
Windows
98 telephony application program
interface (TAPI), including the unimodem and unimo-
dem-V service providers, and can be used with off-the-
shelf TAPI compliant voice and telephony applications.
The DSP1648C chip set supports ITU-T V.253 based
TAM features, using DLE shielded commands and
AT+V commands supporting 7.2 kHz, 8.0 kHz, and
11.025 kHz for both 8-bit and 16-bit samples.
AGERE SYSTEMS
DSP1648C HOST-BASED CONTROLLER MODEM CHIP
ROM CODED
DSP1648C
HOST
PROCESSOR
PCI
100-PIN
TQFP
LINE CODEC
CSP1034C
DAA
TELEPHONE
LINE
48-PIN TQFP
MICROPHONE
AUDIO
CODEC
CSP1027
AUDIO
CIRCUITRY
48-PIN TQFP
SPEAKER
OPTIONAL FOR DSP-BASED FDSP
5-6393 (F) n
Figure 1. Agere Systems DSP1648C and Transformer-Based DAA Block Diagram
with Audio Codec
2
Agere Systems Inc.
Agere Systems DSP1648C
Host-Based Controller V.92 Modem Chip Set
Product Brief
September 2001
Integrated PCI Interface
The DSP1648C features a ROM-coded DSP1600 core
combined with the control and communications logic
required to implement a modem data pump. The
DSP1648 incorporates a PCI interface which supports
two full-duplex bus master streams for greater access
to host system resources. One PCI stream can be
switched between the audio codec interface or the DSP
core. The second full-duplex stream supports 4-word
block transfers between system and DSP core. 3.3 V
and 5 V signaling systems are supported for PCI bus
buffers. The device supply must come from a 3.3 V PCI
supply, vaux, or a regulated 3.3 V supply.
Functional Description
(continued)
Changes from DSP1648 (Mars 3)
DSP1648C is a digital IC that provides the engine for
various modem standards. DSP1648C uses existing
DSP1648 specifications and functionality with some
enhancements. The following is a list of the new fea-
tures:
s
Support for V.92 and V.44:
— Fast connect
— Modem on hold
— PCM upstream
— Improved data compression
Additional on-chip RAM for V.92 support.
Additional PCI power management for future WHQL
requirements.
Lower power dissipation.
s
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I/O Voltage Considerations
The system supply voltage requirement is
3.3 V ± 0.3 Vdc. This device also employs a 5 V
tolerant buffer topology. To support this 5 V tolerant I/O,
the VIO pin (pin 93) is provided as an indicator to the
device of the signaling voltage being used on the bus.
s
AGERE SYSTEMS
LUCENT TECHNOLOGIES
DSP1648C HOST-BASED CONTROLLER MODEM CHIP SET
U-DAA
ROM CODED
DSP1648C
HOST
PROCESSOR
PCI
100-PIN
TQFP
CSP1035A (LINE-POWERED)
LINE
CODEC
UNIVERSAL
DAA
REMAINING
COMPONENTS
FOR
U-DAA
TELEPHONE
LINE
48-PIN TQFP
0670 (F) d
Figure 2. Agere Systems DSP1648C Host-Based Controller Modem Chip Set Block Diagram
without Audio Codec
3
Agere Systems Inc.
Agere Systems DSP1648C
Host-Based Controller V.92 Modem Chip Set
Product Brief
September 2001
Package Information
DSP1648C
CSP
1035A
CSP
1034C
CSP
1027
100-PIN
TQFP
48-PIN
TQFP
48-PIN
TQFP
48-PIN
TQFP
DIME
(U.S.A.)
DSP1648C
CSP1035A
CSP1034C
CSP1027
DIME
0671 (f) c
Figure 3. DSP1648C Chip Set Package Options
Ordering Information
Device
DSP1648C
CSP1034C
CSP1035A
CSP1027
Description
Modem Chip
Modem Codec
Silicon DAA
Audio Codec
Voltage
3.3/5 V
3.3 V
3.3 V
3.3/5 V
Package
100 TQFP
48 TQFP
48 TQFP
48 TQFP
Part Number
1648C-TV5SEGV-DB
CSP1034C-T11
CSP1035A-T11
CSP1027-S11
Comcode
109061374
108159542
108393935
106888555
MNP
is a trademark of Microcom, Inc.
Windows
and
Windows NT
are registered trademarks of Microsoft Corporation.
Linux
is a registered trademark of William Della Croce, Jr.
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., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18109-3286
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) 21-5047-1212
(Shanghai),
(86) 10-6522-5566
(Beijing),
(86) 755-695-7224
(Shenzhen)
JAPAN:
(81) 3-5421-1600
(Tokyo), KOREA:
(82) 2-767-1850
(Seoul), SINGAPORE:
(65) 778-8833,
TAIWAN:
(886) 2-2725-5858
(Taipei)
EUROPE:
Tel. (44) 7000 624624,
FAX (44) 1344 488 045
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.
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